X-Git-Url: http://cloudbase.mooo.com/gitweb/avrcpm.git/blobdiff_plain/99ed719900586348e7c4f3c2c39ebb60ec20bf2b..2f6fa691e25e9cb2971539a3e060ec618a59e0c7:/avrcpm/avr/z80.asm?ds=sidebyside

diff --git a/avrcpm/avr/z80.asm b/avrcpm/avr/z80.asm
index 409cc88..3aca645 100644
--- a/avrcpm/avr/z80.asm
+++ b/avrcpm/avr/z80.asm
@@ -15,12 +15,17 @@
 ;
 ;    You should have received a copy of the GNU General Public License
 ;    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;
+;    $Id$
+;
 
 ;.nolist
 #if defined atmega8
 	.include "m8def.inc"
 #elif defined atmega168
 	.include "m168def.inc"
+#elif defined atmega328P
+	.include "m328Pdef.inc"
 #else                               /* default */
 	.include "m88def.inc"
 	;FUSE_H=0xDF
@@ -29,9 +34,6 @@
 .list
 .listmac
 
-#ifndef DRAM_DQ_ORDER			/* If this is set to 1, the portbits  */
-	#define DRAM_DQ_ORDER 0		/* for DRAM D1 and WE are swapped.    */
-#endif
 
 
 #ifndef F_CPU
@@ -41,11 +43,15 @@
 	#define BAUD   38400           /* console baud rate */
 #endif
  
+#define PARTID 0x52		/* Partition table id */
+				/* http://www.win.tue.nl/~aeb/partitions/partition_types-1.html */
 
 #define UBRR_VAL  ((F_CPU+BAUD*8)/(BAUD*16)-1)  /* clever rounding */
 
 #define	RXBUFSIZE 64		/* USART recieve buffer size. Must be power of 2 */
+#define	TXBUFSIZE 64		/* USART transmit buffer size. Must be power of 2 */
 
+#define DRAM_WAITSTATES 1	/* Number of additional clock cycles for dram read access */
 #define REFR_RATE   64000       /* dram refresh rate in cycles/s. */
 				/* Most drams need 1/15.6µs. */
 #define REFR_PRE    8           /* timer prescale factor */
@@ -53,15 +59,10 @@
 #define REFR_CNT    F_CPU / REFR_RATE / REFR_PRE
 
 
-#if defined __ATmega8__
-	.equ refr_vect = OC2addr
-#else
-	.equ refr_vect = OC2Aaddr
-#endif
 
 #define DRAM_WORD_ACCESS 0	/* experimental */
 
-#define EM_Z80	0	/* we don't have any z80 instructions yet */
+#define EM_Z80	0		/* we don't have any z80 instructions yet */
 
 .equ MMC_DEBUG   = 0
 .equ INS_DEBUG   = 0
@@ -69,6 +70,7 @@
 .equ BOOTWAIT    = 1
 .equ PORT_DEBUG  = 0
 .equ DISK_DEBUG  = 0
+.equ HOSTRW_DEBUG= 0
 .equ MEMFILL_CB  = 1
 .equ STACK_DBG   = 0
 .equ PRINT_PC    = 0
@@ -105,30 +107,24 @@
 .equ ram_ras =	5
 .equ mmc_sck =	5
 
-.equ P_RAS = PORTB
 
+.equ P_RAS = PORTB
 .equ P_AL  = PORTB
 			; ram_a[4..0]
 .equ RAM_AL_MASK = (1<<ram_a4)|(1<<ram_a3)|(1<<ram_a2)|(1<<ram_a1)|(1<<ram_a0)
 .equ PB_OUTPUT_MASK = (1<<ram_ras) | RAM_AL_MASK
 
 ;Port C
-#if DRAM_DQ_ORDER == 1
-.equ ram_d1 =	1
-.equ ram_w  =	4
-#else /* original */
-.equ ram_d1 =	4
-.equ ram_w  =	1
-#endif
 .equ ram_d0 =	0
+.equ ram_d1 =	1
 .equ ram_d2 =	2
 .equ ram_d3 =	3
+.equ ram_w  =	4
 .equ ram_cas=	5
 
 .equ P_DQ  = PORTC
 .equ P_W   = PORTC
 .equ P_CAS = PORTC
-
 .equ RAM_DQ_MASK = (1<<ram_d3)|(1<<ram_d2)|(1<<ram_d1)|(1<<ram_d0)
 .equ PC_OUTPUT_MASK = (1<<ram_cas)|(1<<ram_w)
 
@@ -142,23 +138,20 @@
 .equ ZFL_C	=	0
 
 ;Register definitions
+
 .def	_tmp	= r0	;  0
 .def	_0	= r1
-;.def z_a      = r2
-.def z_b      = r3
-.def z_c      = r4
-.def z_d      = r5
-.def z_e      = r6
-.def z_l      = r7
-.def z_h      = r8
-;.def z_spl    = r9
-;.def z_sph    = r10
 
-.def	z_a	= r11
+.def	z_c	= r4
+.def	z_b	= r5
+.def	z_e	= r6
+.def	z_d	= r7
+.def	z_l	= r8
+.def	z_h	= r9
+.def	z_a	= r10
 
-
-.def	_wl	= r12
-.def	_wh	= r13
+.def	insdecl	= r12	;
+.def	insdech	= r13	;
 .def	z_spl	= r14
 .def	z_sph	= r15	;
 .def	temp	= r16 	;
@@ -166,23 +159,35 @@
 .def	temp3	= r18
 .def	temp4	= r19
 .def	z_flags	= r20	;
-.def	trace	= r21	;
-.def	insdecl	= r22	;
-.def	insdech	= r23	;
+			;
+.def	opl	= r22	;
+.def	oph	= r23	;
 .def	z_pcl	= r24	;
 .def	z_pch	= r25	;
-.undef xl 		;r26
-.undef xh		;r27
-.undef yl		;r28
-.undef yh		;r29
-.def opl	= r26	;
-.def oph	= r27	;
-.def adrl	= r28	;
-.def adrh	= r29	;
+; xl 		;r26
+; xh		;r27
+; yl		;r28
+; yh		;r29
 ; zl		;r30	;
 ; zh		;r31	;
 
 
+
+#if defined __ATmega8__
+.equ	flags	= TWBR
+.equ	P_PUD	= SFIOR
+#else
+.equ	flags	= GPIOR0
+.equ	P_PUD	= MCUCR
+#endif
+
+; Flags:
+	.equ	hostact	= 7		;host active flag
+	.equ	hostwrt	= 6		;host written flag
+	.equ	rsflag	= 5		;read sector flag
+	.equ	readop	= 4		;1 if read operation
+	.equ	trace	= 0
+
 ; This is the base z80 port address for clock access
 #define	TIMERPORT 0x40
 #define TIMER_CTL   TIMERPORT
@@ -194,33 +199,82 @@
 #define printTimerCmd	15
 #define uptimeCmd	16
 
+#if defined __ATmega8__
+.equ	RXTXDR0	= UDR
+.equ	UCSR0A	= UCSRA
+.equ	 UDRE0	= UDRE
+.equ	UCSR0B	= UCSRB
+.equ	 RXCIE0	= RXCIE
+.equ	 UDRIE0	= UDRIE
+.equ	 RXEN0	= RXEN
+.equ	 TXEN0	= TXEN
+.equ	UCSR0C	= UCSRC
+.equ	 UCSZ00	= UCSZ0
+.equ	 UCSZ01	= UCSZ1
+.equ	UBRR0H	= UBRRH
+.equ	UBRR0L	= UBRRL
+.equ	OCR2A	= OCR2
+.equ	OC2Aaddr= OC2addr
+.equ	TCCR2A	= TCCR2
+.equ	TCCR2B	= TCCR2
+.equ	TIMSK1	= TIMSK
+.equ	TIMSK2	= TIMSK
+.equ	OCIE2A	= OCIE2
+.equ	TIFR1	= TIFR
+.equ	ICIE1	= TICIE1
+#else
+.equ	RXTXDR0	= UDR0
+#endif
 
 
-	;SRAM
-	.dseg
-	
-dsk_trk:	.byte	1
-dsk_sec:	.byte	1
-dsk_dmah:	.byte	1
-dsk_dmal:	.byte	1
+;----------------------------------------
+; 
+.macro	outm8
+.if	@0 > 0x3f
+	sts	@0,@1
+.else
+	out	@0,@1
+.endif
+.endm
+
+;----------------------------------------
+; 
+.macro	inm8
+.if	@1 > 0x3f
+	lds	@0,@1
+.else
+	in	@0,@1
+.endif
+.endm
 
-;Sector buffer for 512 byte reads/writes from/to SD-card
 
-sectbuff:
-    .byte   512
+
+;----------------------------------------
+; add wait states
+;	dram_wait  number_of_cycles
+
+.macro dram_wait
+.if @0 > 1
+	rjmp	PC+1
+	dram_wait @0 - 2
+.elif @0 > 0
+	nop
+	dram_wait @0 - 1
+.endif
+.endm
 
 
 .cseg
 .org 0
 	rjmp start		; reset vector
-.org refr_vect
+.org OC2Aaddr
 	rjmp refrint		; tim2cmpa
 .org OC1Aaddr   		; Timer/Counter1 Compare Match A
     	rjmp sysclockint	; 1ms system timer
 .org URXCaddr   
 	rjmp rxint		; USART receive int.
-;.org UDREaddr
-;	rjmp txint
+.org UDREaddr
+	rjmp txint		; USART transmit int.
 	
 .org INT_VECTORS_SIZE
 
@@ -230,124 +284,88 @@ start:
 	ldi temp,high(RAMEND)	; top of memory
 	out SPH,temp		; init stack pointer
 
+	clr	_0
+
 ; - Kill wdt
 	wdr
-#if defined __ATmega8__
-	out MCUCSR,_0
-	
-	ldi temp,(1<<WDCE) | (1<<WDE)
-	out WDTCSR,temp
-	ldi temp,(1<<WDCE)
-	out WDTCSR,temp
-	ldi temp,(1<<PUD)	;disable pullups
-	out SFIOR,temp
-#else
 	out MCUSR,_0
 
 	ldi temp,(1<<WDCE) | (1<<WDE)
-	sts WDTCSR,temp
+	outm8	WDTCSR,temp
 	ldi temp,(1<<WDCE)
-	sts WDTCSR,temp
-	ldi temp,(1<<PUD)	;disable pullups
-	out MCUCR,temp
-#endif
+	outm8	WDTCSR,temp
+
+; - Clear RAM
+
+	ldi	zl,low(SRAM_START)
+	ldi	zh,high(SRAM_START)
+	ldi	temp2,high(ramtop)
+clr_l:
+	st	z+,_0
+	cpi	zl,low(ramtop)
+	cpc	zh,temp2
+	brne	clr_l
 
 ; - Setup Ports
-	ldi temp,PB_OUTPUT_MASK
-	out DDRB,temp
-	ldi temp,PD_OUTPUT_MASK
-	out DDRD,temp
-	ldi temp,PC_OUTPUT_MASK
-	out DDRC,temp
+	ldi 	temp,(1<<PUD)		;disable pullups
+	outm8	P_PUD,temp
+	ldi	temp,0xFF
+	out 	PORTD,temp		;all pins high
+	out 	PORTB,temp
+	out 	PORTC,temp
+	out 	DDRD,temp		; all outputs
+	out	DDRB,temp
+	out	DDRC,temp
 
-	sbi P_W,ram_w
-	sbi P_CAS,ram_cas
-	sbi P_RAS,ram_ras
-	sbi P_OE,ram_oe
-	sbi P_MMC_CS,mmc_cs
+	outm8	TIMSK1,_0
+	outm8	TIMSK2,_0
+	outm8	TCCR2A,_0
+	outm8	TCCR2B,_0
 
 
 ; - Init serial port
 
-	sts	rxcount,_0	; reset receive buffer
-	sts	rxidx_r,_0
-	sts	rxidx_w,_0
-	
-
-#if defined __ATmega8__
-	ldi temp, (1<<TXEN) | (1<<RXEN) | (1<<RXCIE)
-	out UCSRB,temp
-	ldi temp, (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0)
-	out UCSRC,temp
-	ldi temp, HIGH(UBRR_VAL)
-	out UBRRH,temp
-	ldi temp, LOW(UBRR_VAL)
-	out UBRRL,temp
-#else
 	ldi temp, (1<<TXEN0) | (1<<RXEN0) | (1<<RXCIE0)
-	sts UCSR0B,temp
+	outm8 UCSR0B,temp
+.ifdef URSEL
+	ldi temp, (1<<URSEL) | (1<<UCSZ01) | (1<<UCSZ00)
+.else
 	ldi temp, (1<<UCSZ01) | (1<<UCSZ00)
-	sts UCSR0C,temp
+.endif
+	outm8 UCSR0C,temp
 	ldi temp, HIGH(UBRR_VAL)
-	sts UBRR0H,temp
+	outm8 UBRR0H,temp
 	ldi temp, LOW(UBRR_VAL)
-	sts UBRR0L,temp
-#endif
-
-;Init timer2. Refresh-call should happen every (8ms/512)=312 cycles.
-
-#ifdef __ATmega8__
-	ldi temp,REFR_CNT*2             ; 2 cycles per int
-	out OCR2,temp
-	ldi temp,(1<<WGM21) | REFR_CS	;CTC, clk/REFR_PRE
-	out TCCR2,temp
-	ldi temp, (1<<OCIE2)
-	out TIMSK,temp
-#else
-	ldi temp,REFR_CNT 		;=312 cycles
-	sts OCR2A,temp
-	ldi temp, (1<<WGM21)
-	sts TCCR2A,temp
-	ldi temp, REFR_CS		;clk/REFR_PRE
-	sts TCCR2B,temp
-	ldi temp,(1<<OCIE2A)
-	sts TIMSK2,temp
-#endif
-
+	outm8 UBRR0L,temp
 
 ; Init clock/timer system
 
-	ldi	zl,low(timer_base)
-	ldi	zh,high(timer_base)
-	ldi	temp2,timer_size
-ti_loop:
-	st	z+,_0
-	dec	temp2
-	brne	ti_loop
-
 ; Init timer 1 as 1 ms system clock tick.
 
-#ifdef __ATmega8__
 	ldi	temp,high(F_CPU/1000)
-	out	OCR1AH,temp
+	outm8	OCR1AH,temp
 	ldi	temp,low(F_CPU/1000)
-	out	OCR1AL,temp
+	outm8	OCR1AL,temp
 	ldi	temp,(1<<WGM12) | (1<<CS10)	;CTC, clk/1
-	out	TCCR1B,temp
-	in	temp,TIMSK
+	outm8	TCCR1B,temp
+	inm8	temp,TIMSK1
 	ori	temp,(1<<OCIE1A)
-	out	TIMSK,temp
-#else
-	ldi	temp,high(F_CPU/1000)
-	sts	OCR1AH,temp
-	ldi	temp,low(F_CPU/1000)
-	sts	OCR1AL,temp
-	ldi	temp,(1<<WGM12) | (1<<CS10)	;CTC, clk/1
-	sts	TCCR1B,temp
-	lds	temp,TIMSK1
-	ori	temp,(1<<OCIE1A)
-	sts	TIMSK1,temp
-#endif
+	outm8	TIMSK1,temp
+
+;Init timer2. Refresh-call should happen every (8ms/512)=312 cycles.
+
+	ldi	temp,REFR_CNT*2			; 2 cycles per int
+	outm8	OCR2A,temp
+	inm8	temp,TCCR2A
+	ori	temp,(1<<WGM21)			;CTC mode
+	outm8	TCCR2A,temp
+	inm8	temp,TCCR2B
+	ori	temp,REFR_CS			;clk/REFR_PRE
+	outm8	TCCR2B,temp
+	inm8	temp,TIMSK2
+	ori	temp, (1<<OCIE2A)
+	outm8	TIMSK2,temp
+
 	sei
 
 
@@ -361,23 +379,18 @@ ti_loop:
 	.db "CPM on an AVR, v1.0",13,0,0
 
 
-	rcall printstr
-	.db "Initing mmc...",13,0
-	rcall mmcInit
-
-
 .if MEMTEST
 	rcall printstr
 	.db "Testing RAM: fill...",0,0
 
 ;Fill RAM
-	ldi adrl,0
-	ldi adrh,0
+	ldi xl,0
+	ldi xh,0
 ramtestw:
-	mov temp,adrh
-	eor temp,adrl
+	mov temp,xh
+	eor temp,xl
 	rcall memwritebyte
-	adiw adrl,1
+	adiw xl,1
 	brcc ramtestw
 	rcall printstr
 	.db "wait...",0
@@ -393,70 +406,175 @@ ramtestwl:
 	.db "reread...",13,0,0
 
 ;re-read RAM
-	ldi adrl,0
-	ldi adrh,0
+	ldi xl,0
+	ldi xh,0
 ramtestr:
-	rcall memreadbyte
-	mov temp2,adrh
-	eor temp2,adrl
+	rcall memReadByte
+	mov temp2,xh
+	eor temp2,xl
 	cp temp,temp2
 	breq ramtestrok
 	rcall printhex
 	ldi temp,'<'
 	rcall uartPutc
-	mov temp,adrh
-	eor temp,adrl
+	mov temp,xh
+	eor temp,xl
 	rcall printhex
 	ldi temp,'@'
 	rcall uartPutc
-	mov temp,adrh
+	mov temp,xh
 	rcall printhex
-	mov temp,adrl
+	mov temp,xl
 	rcall printhex
 	ldi temp,13
 	rcall uartPutc
 ramtestrok:
-	adiw adrl,1
+	adiw xl,1
 	brcc ramtestr
 
 .endif
 
 .if MEMFILL_CB
 	;Fill ram with cbs, which (for now) will trigger an invalid opcode error.
-	ldi adrl,0
-	ldi adrh,0
+	ldi xl,0
+	ldi xh,0
 ramfillw:
 	ldi temp,0xcb
 	rcall memwritebyte
-	adiw adrl,1
+	adiw xl,1
 	brcc ramfillw
 .endif
 
 
+	rcall printstr
+	.db "Initing mmc...",13,0
+	rcall mmcInit
+
+;----------------------------------------------------------------------------
+
+; Partition table offsets:
+#define PART_TYPE   4
+#define PART_START  8
+#define PART_SIZE  12
+
+;Load first sector from MMC (boot sector)
+
+boot_again:
+	ldi	yh,0
+	ldi	yl,0
+	movw	x,y
+	rcall	mmcReadSect
 
-;Load initial sector from MMC (512 bytes)
-	ldi adrh,0
-	ldi adrl,0
-	rcall mmcReadSect
+;Test, if it has a valid MBR
+
+	lds	temp,hostbuf+510	;MBR signature (0xAA55)  at and of sector?
+	lds	temp2,hostbuf+511
+	ldi	temp4,0xAA
+	cpi	temp,0x55		
+	cpc	temp2,temp4
+	ldi	opl,0			;opl holds number of found disks (paritions)
+	breq	boot_part
+
+;No MBR, no partition table ...
+	inc	opl			;pretend we have one.
+	rjmp	boot_ipl
+		
+;Search Partition Table for CP/M partitions
+boot_part:
+	ldi	zl,low(hostbuf+510-64)
+	ldi	zh,high(hostbuf+510-64)
+	ldi	yl,low(hostparttbl)
+	ldi	yh,high(hostparttbl)
+	ldi	oph,high(hostbuf+510)
+boot_ploop:
+	ldd	temp,z+PART_TYPE
+	cpi	temp,PARTID
+	brne	boot_nextp
+	
+; Found a CP/M partition
+	
+	ldd	temp,z+PART_START
+	st	y+,temp
+	ldd	temp2,z+PART_START+1
+	st	y+,temp2
+	ldd	temp3,z+PART_START+2
+	st	y+,temp3
+	ldd	temp4,z+PART_START+3
+	st	y+,temp4
+	
+	rcall	printstr
+	.db	"CP/M partition at: ",0
+	rcall	print_ultoa
+	rcall	printstr
+	.db	", size: ",0,0
+	ldd	temp,z+PART_SIZE
+	st	y+,temp
+	ldd	temp2,z+PART_SIZE+1
+	st	y+,temp2
+	ldd	temp3,z+PART_SIZE+2
+	st	y+,temp3
+	ldd	temp4,z+PART_SIZE+3
+	st	y+,temp4
+	lsr	temp4
+	ror	temp3
+	ror	temp2
+	ror	temp
+	rcall	print_ultoa
+	rcall	printstr
+	.db	"KB.",13,0,0
+	
+	inc	opl
+	cpi	opl,MAXDISKS
+	breq	boot_pend	
+boot_nextp:
+	adiw	zl,16
+	cpi	zl,low(hostbuf+510)
+	cpc	zh,oph
+	brsh	boot_pend
+	rjmp	boot_ploop
+boot_pend:
+
+; Read first sector of first CP/M partition
+
+	lds	xl,hostparttbl
+	lds	xh,hostparttbl+1
+	lds	yl,hostparttbl+2
+	lds	yh,hostparttbl+3
+	rcall	mmcReadSect
+
+boot_ipl:
+	sts	ndisks,opl
+	tst	opl
+	brne	boot_ipl2
+	rcall	printstr
+	.db	"No bootable CP/M disk found! Please change MMC/SD-Card",13,0
+	ldi	temp2,18
+boot_wl:
+	ldi	temp,255
+	rcall	delay_ms
+	dec	temp2
+	brne	boot_wl
+	rjmp	boot_again
+	
+
+boot_ipl2:
+
+;First sector of disk or first CP/M partition is in hostbuf.
 
 ;Save to Z80 RAM (only 128 bytes because that's retro)
-	ldi zl,low(sectbuff)
-	ldi zh,high(sectbuff)
-	ldi adrh,0x20
-	ldi adrl,0x00
+	ldi zl,low(hostbuf)
+	ldi zh,high(hostbuf)
+	ldi xh,0x20
+	ldi xl,0x00
 iplwriteloop:
 	ld temp,z+
-	push zh
-	push zl
 	rcall memWriteByte
-	pop zl
-	pop zh
-	adiw adrl,1
-	cpi zl,low(sectbuff+128)
+	adiw xl,1
+	cpi zl,low(hostbuf+128)
 	brne iplwriteloop
-	cpi zh,high(sectbuff+128)
+	cpi zh,high(hostbuf+128)
 	brne iplwriteloop
-
+	rcall	dsk_boot		;init (de)blocking buffer
 
 
 ;Init z80
@@ -465,17 +583,17 @@ iplwriteloop:
 	ldi temp,0x20
 	mov z_pch,temp
 
-	ldi trace,0
+	cbi	flags,trace
 	rcall printstr
 	.db 13,"Ok, CPU is live!",13,0,0
 
 main:
-	ldi trace,0
+	cbi	flags,trace
 	cpi z_pch,1
 	brlo notraceon
 	cpi z_pch,$dc
 	brsh notraceon
-	ldi trace,1
+	sbi	flags,trace
 notraceon:
 
 
@@ -486,31 +604,31 @@ notraceon:
 	brsh noprintpc
 
 	rcall printstr
-	.db "PC=",0
+	.db 13,"PC=",0
 	mov temp,z_pch
 	rcall printhex
 	mov temp,z_pcl
 	rcall printhex
-	ldi temp,10
-	rcall uartputc
+	ldi temp,' '
+;	ldi temp,10
+;	rcall uartputc
 noprintpc:
 .endif
 
 	; *** Stage 1: Fetch next opcode
-	movw adrl,z_pcl
+	movw xl,z_pcl
 	rcall memReadByte
-	adiw z_pcl,1
 
 
 .if INS_DEBUG
-	cpi trace,0
-	breq notrace1
+	sbis	flags,trace
+	rjmp	notrace1
 	rcall printstr
 	.db "PC=",0
 	push temp
-	mov temp,adrh
+	mov temp,z_pch
 	rcall printhex
-	mov temp,adrl
+	mov temp,z_pcl
 	rcall printhex
 	pop temp
 	rcall printstr
@@ -518,6 +636,7 @@ noprintpc:
 	rcall printhex
 notrace1:
 .endif
+	adiw z_pcl,1
 
 	; *** Stage 2: Decode it using the ins_table.
 	ldi zh,high(inst_table*2)
@@ -528,16 +647,16 @@ notrace1:
 	lpm insdech,Z
 
 .if INS_DEBUG
-	cpi trace,0
-	breq notrace2
+	sbis	flags,trace
+	rjmp	notrace2
 	rcall printstr
-	.db ", decoded=",0
+	.db ", decoded=",0,0
 	mov temp,insdech
 	rcall printhex
 	mov temp,insdecl
 	rcall printhex
 	rcall printstr
-	.db ".",13,0
+	.db ".",13,0,0
 notrace2:
 .endif
 
@@ -552,8 +671,8 @@ notrace2:
 	icall
 
 .if INS_DEBUG
-	cpi trace,0
-	breq notrace3
+	sbis	flags,trace
+	rjmp	notrace3
 	rcall printstr
 	.db "pre: oph:l=",0
 	mov temp,oph
@@ -561,7 +680,7 @@ notrace2:
 	mov temp,opl
 	rcall printhex
 	rcall printstr
-	.db " -- ",0
+	.db " -- ",0,0
 notrace3:
 .endif
 
@@ -579,10 +698,10 @@ nofetch:
 	icall
 
 .if INS_DEBUG
-	cpi trace,0
-	breq notrace4
+	sbis	flags,trace
+	rjmp	notrace4
 	rcall printstr
-	.db ",post:oph:l=",0
+	.db ",post:oph:l=",0,0
 	mov temp,oph
 	rcall printhex
 	mov temp,opl
@@ -594,10 +713,10 @@ nooper:
 	; *** Stage 5: Store operand. Use the store jumptable for this.
 	swap insdecl
 	swap insdech
-	mov temp,insdecl
+	movw temp,insdecl
 	andi temp,0x0E
-	andi insdech,0x30
-	or temp,insdech
+	andi temp2,0x30
+	or temp,temp2
 	breq nostore
 	lsr temp
 	ldi zl,low(storejumps)
@@ -607,8 +726,8 @@ nooper:
 	icall
 
 .if INS_DEBUG
-	cpi trace,0
-	breq notrace5
+	sbis	flags,trace
+	rjmp	notrace5
 	rcall printstr
 	.db ", stored.",0
 notrace5:
@@ -617,8 +736,8 @@ notrace5:
 nostore:
 
 .if INS_DEBUG
-	cpi trace,0
-	breq notrace6
+	sbis	flags,trace
+	rjmp	notrace6
 	rcall printstr
 	.db 13,0
 notrace6:
@@ -632,16 +751,70 @@ notrace6:
 
 ;The hw is modelled to make writing a CPM BIOS easier.
 ;Ports:
-;0 - Con status. Returns 0xFF if the UART has a byte, 0 otherwise.
-;1 - Console input, aka UDR.
-;2 - Console output
-;16 - Track select
-;18 - Sector select
-;20 - Write addr l
-;21 - Write addr h
-;22 - Trigger - write 1 to read, 2 to write a sector using the above info.
-;	This will automatically move track, sector and dma addr to the next sector.
+;0 	- Con status. Returns 0xFF if the UART has a byte, 0 otherwise.
+;1 	- Console input, aka UDR.
+;2 	- Console output
+;15	- Disk select
+;16,17 	- Track select
+;18 	- Sector select
+;20 	- Write addr l
+;21 	- Write addr h
+;22 	- Trigger - write  to read, to write a sector using the above info;
+;			, write to allocated/dirctory/unallocated
+
+	.equ	READ_FUNC  = 7
+	.equ	WRITE_FUNC = 6
+	.equ	BOOT_FUNC  = 5
+	.equ	HOME_FUNC  = 4
+
+
+
+;*****************************************************
+;*         CP/M to host disk constants               *
+;*****************************************************
+	.equ	MAXDISKS  = 4		;Max number of Disks (partitions)
+	.equ	blksize = 1024		;CP/M allocation size
+	.equ	hostsize = 512		;host disk sector size
+;	.equ	hostspt = 20		;host disk sectors/trk
+	.equ	hostblk = hostsize/128	;CP/M sects/host buff
+;	.equ	CPMSPT = hostblk*hostspt;CP/M sectors/track
+	.equ	CPMSPT = 26		;
+	.equ	SECMSK = hostblk-1	;sector mask
+	.equ	SECSHF = log2(hostblk)	;sector shift
+
+;*****************************************************
+;*        BDOS constants on entry to write           *
+;*****************************************************
+	.equ	WRALL = 0		;write to allocated
+	.equ	WRDIR = 1		;write to directory
+	.equ	WRUAL = 2		;write to unallocated
+	.equ	WRTMSK= 3		;write type mask
+
+
+	.dseg
+ndisks:		.byte	1	;Number of CP/M disks
+
+seekdsk:	.byte	1	;seek disk number
+seektrk:	.byte	2	;seek track number
+seeksec:	.byte	1	;seek sector number
 
+hostparttbl:	.byte	8*MAXDISKS ; host partition table (start sector, sector count)
+hostdsk:	.byte	1	;host disk number
+hostlba:	.byte	3	;host sector number (relative to partition start)
+
+unacnt:		.byte	1	;unalloc rec cnt
+unadsk:		.byte	1	;last unalloc disk
+unatrk:		.byte	2	;last unalloc track
+unasec:		.byte	1	;last unalloc sector
+
+erflag:		.byte	1	;error reporting
+wrtype:		.byte	1	;write operation type
+dmaadr:		.byte	2	;last dma address
+hostbuf:	.byte	hostsize;host buffer (from/to SD-card)
+
+
+	.cseg
+	
 ;Called with port in temp2. Should return value in temp.
 portRead:
 	cpi temp2,0
@@ -649,6 +822,11 @@ portRead:
 	cpi temp2,1
 	breq conInp
 
+	cpi	temp2,15
+	breq	dskDiskCheck
+	cpi	temp2,22
+	breq	dskErrorRet
+
 	cpi	temp2,TIMER_MSECS
 	brlo	pr_noclock
 	cpi	temp2,TIMER_MSECS+6
@@ -665,14 +843,20 @@ portWrite:
 	breq dbgOut
 	cpi temp2,2
 	breq conOut
+
+	cpi temp2,15
+	breq dskDiskSel
 	cpi temp2,16
-	breq dskTrackSel
+	breq dskTrackSel_l
+	cpi temp2,17
+	breq dskTrackSel_h
 	cpi temp2,18
 	breq dskSecSel
 	cpi temp2,20
 	breq dskDmaL
 	cpi temp2,21
 	breq dskDmaH
+
 	cpi temp2,22
 	breq dskDoIt
 	
@@ -695,8 +879,7 @@ conStatus:
 	ret
 
 conInp:
-	rcall uartGetc
-	ret
+	rjmp uartGetc
 
 dbgOut:
 	rcall printstr
@@ -707,201 +890,510 @@ dbgOut:
 	ret
 
 conOut:
-	rcall uartputc
+	rjmp uartputc
+
+
+dskDiskCheck:
+	lds	temp,seekdsk
+	lds	temp2,ndisks	;check if selected disk # is less then # of disks
+	cp	temp,temp2
+	ldi	temp,0
+	brlt	PC+2
+	ldi	temp,0xff		;error return
+	ret
+	
+dsk_dchend:
+	ldi	temp,0
+	ret
+	
+dskErrorRet:
+	lds	temp,erflag
 	ret
 
+dskDiskSel:
+	sts seekdsk,temp
+	ret
 
+dskTrackSel_l:
+	sts seektrk,temp
+	sts seektrk+1,_0
+	ret
 
-dskTrackSel:
-	sts dsk_trk,temp
+dskTrackSel_h:
+	sts seektrk+1,temp
 	ret
 
 dskSecSel:
-	sts dsk_sec,temp
+	sts seeksec,temp
 	ret
 
 dskDmal:
-	sts dsk_dmal,temp
+	sts dmaadr,temp
 	ret
 
 dskDmah:
-	sts dsk_dmah,temp
+	sts dmaadr+1,temp
 	ret
 
 dskDoIt:
 .if DISK_DEBUG
 	push temp
+	sbrc	temp,READ_FUNC
+	 rjmp	dskdbgr
+	sbrc	temp,WRITE_FUNC
+	 rjmp	dskdbgw
+	rjmp	dskdbge
+
+dskdbgr:
+	rcall printstr
+	.db 13,"Disk read:  ",0
+	rjmp	dskdbg1
+dskdbgw:
 	rcall printstr
-	.db "Disk read: track ",0
-	lds temp,dsk_trk
+	.db 13,"Disk write: ",0
+dskdbg1:
+	lds	temp,seekdsk
+	subi	temp,-('A')
+	rcall	uartputc
+	rcall	printstr
+	.db	": track ",0,0
+	lds temp,seektrk+1
+	rcall printhex
+	lds temp,seektrk
 	rcall printhex
 	rcall printstr
-	.db " sector ",0
-	lds temp,dsk_sec
+	.db " sector ",0,0
+	lds temp,seeksec
 	rcall printhex
 	rcall printstr
-	.db " dma-addr ",0
-	lds temp,dsk_dmah
+	.db " dma-addr ",0,0
+	lds temp,dmaadr+1
 	rcall printhex
-	lds temp,dsk_dmal
+	lds temp,dmaadr
 	rcall printhex
+	pop	temp
+	push	temp
+	sbrs	temp,WRITE_FUNC
+	 rjmp	dskdbge
 	rcall printstr
-	.db ".",13,0
+	.db " wrtype ",0,0
+	andi	temp,3
+	rcall printhex
+dskdbge:
 	pop temp
 .endif
+	;See what has to be done.
+	sbrc	temp,READ_FUNC
+	 rjmp	dsk_read
+	sbrc	temp,WRITE_FUNC
+	 rjmp	dsk_write
+	sbrc	temp,HOME_FUNC
+	 rjmp	dsk_home
+	sbrc	temp,BOOT_FUNC
+	 rjmp	dsk_boot
+
+	rcall	printstr
+	.db "DISK I/O: Invalid Function code: ",0
+	rcall	printhex
+	rjmp	haltinv
+
+dsk_boot:
+	cbi	flags,hostact		;host buffer inactive
+	sts	unacnt,_0		;clear unalloc count
+	ret
+
+dsk_home:
+	sbis	flags,hostwrt		;check for pending write
+	cbi	flags,hostact		;clear host active flag
+	ret
+
+
+dsk_read:
+
+	sbi	flags,readop		;read operation
+	;RAM disk?
+	lds	temp2,seekdsk
+;	cpi	temp2,RAMDISKNR
+;	brlt	PC+2
+;	 rjmp	rdskDoIt
+
+	sts	unacnt,_0
+	sbi	flags,rsflag		;must read data
+	ldi	temp,WRUAL		;write type
+	sts	wrtype,temp		;treat as unalloc
+	rjmp	dsk_rwoper		;to perform the read
+
+
+dsk_write:
+	;write the selected CP/M sector
+
+	cbi	flags,readop		;not a read operation
+
+	;RAM disk?
+	lds	temp2,seekdsk
+;	cpi	temp2,RAMDISKNR
+;	brlt	PC+2
+;	 rjmp	rdskDoIt
+	andi	temp,WRTMSK
+	sts	wrtype,temp		;save write type
+
+	cpi	temp,WRUAL		;write unallocated?
+	brne	dsk_chkuna		;check for unalloc
+
+;	write to unallocated, set parameters
+	ldi	temp,blksize/128	;next unalloc recs
+	sts	unacnt,temp
+	lds	temp,seekdsk		;disk to seek
+	sts	unadsk,temp		;unadsk = sekdsk
+	lds	temp,seektrk
+	sts	unatrk,temp		;unatrk = sectrk
+	lds	temp,seektrk+1
+	sts	unatrk+1,temp		;unatrk = sectrk
+	lds	temp,seeksec
+	sts	unasec,temp		;unasec = seksec
+;
+dsk_chkuna:
+	;check for write to unallocated sector
+	lds	temp,unacnt		;any unalloc remain?
+	tst	temp
+	breq	dsk_alloc		;skip if not
+
+;	more unallocated records remain
+	dec	temp			;unacnt = unacnt-1
+	sts	unacnt,temp
+	lds	temp,seekdsk		;same disk?
+	lds	temp2,unadsk
+	cp	temp,temp2		;seekdsk = unadsk?
+	brne	dsk_alloc		;skip if not
+
+;	disks are the same
+	lds	temp,unatrk
+	lds	temp2,unatrk+1
+	lds	temp3,seektrk
+	lds	temp4,seektrk+1
+	cp	temp,temp3		;seektrk = unatrk?
+	cpc	temp2,temp4
+	brne	dsk_alloc		;skip if not
+
+;	tracks are the same
+	lds	temp,seeksec		;same sector?
+	lds	temp2,unasec
+	cp	temp,temp2		;seeksec = unasec?
+	brne	dsk_alloc		;skip if not
+
+;	match, move to next sector for future ref
+	inc	temp2			;unasec = unasec+1
+	sts	unasec,temp2
+	cpi	temp2,CPMSPT		;end of track? (count CP/M sectors)
+	brlo	dsk_noovf		;skip if no overflow
+
+;	overflow to next track
+	sts	unasec,_0		;unasec = 0
+	lds	temp,unatrk
+	lds	temp2,unatrk+1
+	subi	temp, low(-1)		;unatrk = unatrk+1
+	sbci	temp2,high(-1)
+	sts	unatrk,temp
+	sts	unatrk+1,temp2
+;
+dsk_noovf:
+	cbi	flags,rsflag		;rsflag = 0
+	rjmp	dsk_rwoper		;to perform the write
+;
+dsk_alloc:
+	;not an unallocated record, requires pre-read
+	sts	unacnt,_0		;unacnt = 0
+	sbi	flags,rsflag		;rsflag = 1
 
-	;First, convert track/sector to an LBA address (in 128byte blocks)
-	push temp
-	lds adrl,dsk_sec
-	ldi adrh,0
-	lds temp2,dsk_trk
-	ldi temp,26
-dskXlateLoop:
-	cpi temp2,0
-	breq dskXlateLoopEnd
-	add adrl,temp
-	adc adrh,_0
-	dec temp2
-	rjmp dskXlateLoop
-dskXlateLoopEnd:
-	pop temp
-
-	;Now, see what has to be done.
-	cpi temp,1
-	breq dskDoItRead
-	cpi temp,2
-	breq dskDoItWrite
-
-dskDoItRead:
-	push adrl
-	;Convert from 128-byte LBA blocks to 512-byte LBA blocks
-	lsr adrh
-	ror adrl
-	lsr adrh
-	ror adrl
-	;Read 512-byte sector
-	rcall mmcReadSect
-	pop adrl
-
-	;Now, move the correct portion of the sector from AVR ram to Z80 ram
-	ldi zl,low(sectbuff)
-	ldi zh,high(sectbuff)
-	ldi temp,128
-	ldi temp2,0
-	sbrc adrl,0
-	 add zl,temp
-	sbrc adrl,0
-	 adc zh,temp2
-	sbrc adrl,1
-	 inc zh
-
-	lds adrh,dsk_dmah
-	lds adrl,dsk_dmal
-
-	ldi temp2,128
-dskDoItReadMemLoop:
-	push temp2
-	ld temp,z+
-	push zh
-	push zl
-	rcall memWriteByte
-	pop zl
-	pop zh
-	adiw adrl,1
-	pop temp2
-	dec temp2
-	brne dskDoItReadMemLoop
-	ret
-
-dskDoItWrite:
-;The write routines is a bit naive: it'll read the 512-byte sector the 128byte CPM-sector
-;resides in into memory, will overwrite the needed 128 byte with the Z80s memory buffer
-;and will then write it back to disk. In theory, this would mean that every 512 bytes
-;written will take 4 write cycles, while theoretically the writes could be deferred so we
-;would only have to do one write cycle.
+;*****************************************************
+;*	Common code for READ and WRITE follows       *
+;*****************************************************
 
+dsk_rwoper:
+	;enter here to perform the read/write
 .if DISK_DEBUG
-	push temp
-	rcall printstr
-	.db "Disk write: track ",0
-	lds temp,dsk_trk
-	rcall printhex
-	rcall printstr
-	.db " sector ",0
-	lds temp,dsk_sec
-	rcall printhex
+	rcall	printstr
+	.db	", flags: ",0
+	in	temp,flags
+	rcall	printhex
+.endif
+	sts	erflag,_0	;no errors (yet)
+
+	;Convert track/sector to an LBA address (in 128byte blocks)
+
+	lds	xl,seeksec		;
+	ldi	xh,0			;
+	ldi	yl,0			;
+	lds	temp3,seektrk		;
+	lds	temp4,seektrk+1		;
+	ldi	temp,CPMSPT		;
+	mul	temp3,temp		;
+	add	xl,r0			;
+	adc	xh,r1			;
+	mul	temp4,temp		;
+	add	xh,r0			;yl:xh:xl := sec + trk * SectorsPerTrack
+	adc	yl,r1			;
+	clr	_0
+
+	mov	temp,xl
+	andi	temp,SECMSK		;mask buffer number
+	push	temp			;save for later
+
+	;Convert from CP/M LBA blocks to host LBA blocks
+	ldi temp,SECSHF
+dsk_sh1:
+	lsr	yl
+	ror	xh
+	ror	xl
+	dec	temp
+	brne	dsk_sh1
+					;yl:xh:xl = host block to seek
+;	active host sector?
+	in	_tmp,flags		;host active flag
+	sbi	flags,hostact		;always becomes 1
+	sbrs	_tmp,hostact		;was it already?
+	 rjmp	dsk_filhst		;fill host if not
+
+;	host buffer active, same as seek buffer?
+	lds	temp,seekdsk
+	lds	temp2,hostdsk		;same disk?
+	cp	temp,temp2		;seekdsk = hostdsk?
+	brne	dsk_nomatch
+
+;	same disk, same block?
+	lds	temp,hostlba
+	lds	temp2,hostlba+1
+	lds	temp3,hostlba+2
+	cp	xl,temp
+	cpc	xh,temp2
+	cpc	yl,temp3
+	breq	dsk_match
+;
+dsk_nomatch:
+	;proper disk, but not correct sector
+	sbis	flags,hostwrt		;host written?
+	 rjmp	dsk_filhst
+	push	xl
+	push	xh
+	push	yl
+	 rcall	dsk_writehost		;clear host buff
+	pop	yl
+	pop	xh
+	pop	xl
+
+dsk_filhst:
+	;may have to fill the host buffer
+	lds	temp,seekdsk
+	sts	hostdsk,temp
+	sts	hostlba,xl
+	sts	hostlba+1,xh
+	sts	hostlba+2,yl
+
+	sbic	flags,rsflag		;need to read?
+	 rcall	dsk_readhost		;yes, if 1
+	cbi	flags,hostwrt		;no pending write
+
+dsk_match:
+
+	;copy data to or from buffer
+	ldi	zl,low(hostbuf)
+	ldi	zh,high(hostbuf)
+	ldi	temp,128
+	pop	temp2			;get buffer number (which part of hostbuf)
+	mul	temp2,temp
+	add	zl,r0			;offset in hostbuf
+	adc	zh,r1
+.if 0 ; DISK_DEBUG
+	push	r0
+	push	r1
+	clr	_0
 	rcall printstr
-	.db " dma-addr ",0
-	lds temp,dsk_dmah
+	.db "; host buf adr: ",0,0
+	pop	temp
 	rcall printhex
-	lds temp,dsk_dmal
+	pop	temp
 	rcall printhex
-	rcall printstr
-	.db ".",13,0
-	pop temp
 .endif
+	clr	_0
+
+	lds	xl,dmaadr
+	lds	xh,dmaadr+1
+	ldi	temp3,128			;length of move
+	sbic	flags,readop		;which way?
+	 rjmp	dsk_rmove		;skip if read
+
+;	mark write operation
+	sbi	flags,hostwrt		;hostwrt = 1
+dsk_wmove:
+	rcall	memReadByte
+	st	z+,temp
+	adiw	xl,1
+	dec	temp3
+	brne dsk_wmove
+	rjmp	dsk_rwmfin
+	
+dsk_rmove:
+	ld	temp,z+
+	rcall	memWriteByte
+	adiw	xl,1
+	dec	temp3
+	brne	dsk_rmove
+dsk_rwmfin:
+;	data has been moved to/from host buffer
+	lds	temp,wrtype	;write type
+	cpi	temp,WRDIR	;to directory?
+	breq	dsk_wdir
+	ret			;no further processing
+dsk_wdir:
+;	clear host buffer for directory write
+	lds	temp,erflag
+	tst	temp		;errors?
+	breq	dsk_wdir1
+	ret			;skip if so
+dsk_wdir1:
+	rcall	dsk_writehost	;clear host buff
+	cbi	flags,hostwrt	;buffer written
+	ret
+
+;*****************************************************
+
+; hostdsk = host disk #,  (partition #)
+; hostlba = host block #, relative to partition start 
+; Read/Write "hostsize" bytes to/from hostbuf
+	
 
+dsk_hostparam:
+	ldi	zl,low(hostparttbl)
+	ldi	zh,high(hostparttbl)
+	lds	temp,hostdsk
+.if HOSTRW_DEBUG
+	push	temp
+	subi	temp,-('A')
+	rcall	uartputc
+	rcall	printstr
+	.db	": ",0,0
+	pop	temp
+.endif
 
-	push adrl
-	push adrh
-	;Convert from 128-byte LBA blocks to 512-byte LBA blocks
-	lsr adrh
-	ror adrl
-	lsr adrh
-	ror adrl
-	;Read 512-byte sector
-	rcall mmcReadSect
-	pop adrh
-	pop adrl
-
-	push adrl
-	push adrh
-
-;Copy the data from the Z80 DMA buffer in external memory to the right place in the
-;sector buffer.
-	;Now, move the correct portion of the sector from AVR ram to Z80 ram
-	ldi zl,low(sectbuff)
-	ldi zh,high(sectbuff)
-	ldi temp,128
-	ldi temp2,0
-	sbrc adrl,0
-	 add zl,temp
-	sbrc adrl,0
-	 adc zh,temp2
-	sbrc adrl,1
-	 inc zh
-	lds adrh,dsk_dmah
-	lds adrl,dsk_dmal
-	ldi temp2,128
-dskDoItWriteMemLoop:
-	push temp2
+	lsl	temp		
+	lsl	temp		
+	lsl	temp		
+	add	zl,temp		
+	adc	zh,_0		
 
-	push zh
-	push zl
-	rcall memReadByte
-	pop zl
-	pop zh
-	st z+,temp
-	adiw adrl,1
+	lds	temp,hostlba
+	lds	temp2,hostlba+1
+	lds	temp3,hostlba+2
 
-	pop temp2
-	dec temp2
-	brne dskDoItWriteMemLoop
+.if HOSTRW_DEBUG
+	rcall	printstr
+	.db	"lba: ",0
+	clr	temp4
+	rcall	print_ultoa
+.endif
+
+	ldd	xl,z+4
+	ldd	xh,z+5
+	ldd	yl,z+6
+	
+	cp	temp,xl
+	cpc	temp2,xh
+	cpc	temp3,yl
+	brcs	dsk_hp1
+	
+.if HOSTRW_DEBUG
+	rcall	printstr
+	.db	", max: ",0
+	push	temp4
+	push	temp3
+	push	temp2
+	push	temp
+	movw	temp,x
+	mov	temp3,yl
+	clr	temp4
+	rcall	print_ultoa
+	pop	temp
+	pop	temp2
+	pop	temp3
+	pop	temp4
+	rcall	printstr
+	.db	" ",0
+.endif
+	
+	clr	temp
+	ret
+
+dsk_hp1:
+	ldd	xl,z+0
+	ldd	xh,z+1
+	ldd	yl,z+2
+	ldd	yh,z+3
+
+	add	xl,temp
+	adc	xh,temp2
+	adc	zl,temp3
+	adc	zh,_0
+.if HOSTRW_DEBUG
+	rcall	printstr
+	.db	", abs:",0,0
+	push	temp4
+	push	temp3
+	push	temp2
+	push	temp
+	movw	temp,x
+	movw	temp3,y
+	rcall	print_ultoa
+	pop	temp
+	pop	temp2
+	pop	temp3
+	pop	temp4
+	rcall	printstr
+	.db	" ",0
+.endif
+	ori	temp,255
+dsk_hpex:
+	ret
 
-	pop adrh
-	pop adrl
+;*****************************************************
+;*	WRITEhost performs the physical write to     *
+;*	the host disk, READhost reads the physical   *
+;*	disk.					     *
+;*****************************************************
 
-	;Convert from 128-byte LBA blocks to 512-byte LBA blocks
-	lsr adrh
-	ror adrl
-	lsr adrh
-	ror adrl
-	;Write the sector back.
-	rcall mmcWriteSect
+dsk_writehost:
+.if HOSTRW_DEBUG
+	rcall	printstr
+	.db	13,"host write ",0,0
+.endif
+	rcall	dsk_hostparam
+	brne	dsk_wr1
+	ldi	temp,255
+	sts	erflag,temp
+	ret
+	
+dsk_wr1:
+	rcall	mmcWriteSect
+	sts	erflag,_0
+	ret
 
-	;All done :)
+dsk_readhost:
+.if HOSTRW_DEBUG
+	rcall	printstr
+	.db	13,"host read  ",0,0
+.endif
+	rcall	dsk_hostparam
+	brne	dsk_rd1
+	ldi	temp,255
+	sts	erflag,temp
 	ret
 	
+dsk_rd1:
+	rcall	mmcReadSect
+	sts	erflag,_0
+	ret
+
+
+;***************************************************************************
 
 ; ----------------- MMC/SD routines ------------------
 
@@ -910,8 +1402,6 @@ mmcByteNoSend:
 mmcByte:
 
 .if MMC_DEBUG
-	push zl
-	push zh
 	rcall printstr
 	.db "MMC: <--",0
 	rcall printhex
@@ -925,15 +1415,11 @@ mmcWrByteW:
 	in temp,SPDR
 
 .if MMC_DEBUG
-	push temp
 	rcall printstr
 	.db ", -->",0
 	rcall printhex
 	rcall printstr
 	.db ".",13,0
-	pop temp
-	pop zh
-	pop zl
 .endif
 	ret
 
@@ -1070,8 +1556,8 @@ mmcInitOcrLoopDone:
 	ret
 
 
-;Call this with adrh:adrl = sector number
-;16bit lba address means a max reach of 32M.
+;Call this with yh:yl:xh:xl = sector number
+;
 mmcReadSect:
 	ldi temp,0x50
 	out SPCR,temp
@@ -1080,14 +1566,14 @@ mmcReadSect:
 	rcall mmcByteNoSend
 	ldi temp,0x51	;cmd (read sector)
 	rcall mmcByte
-	ldi temp,0
-	lsl adrl
-	rol adrh
-	rol temp
+	lsl	xl			;convert to byte address (*512)
+	rol	xh
+	rol 	yl
+	mov	temp,yl
 	rcall mmcByte
-	mov temp,adrh ;pxl
+	mov temp,xh ;pxl
 	rcall mmcByte
-	mov temp,adrl ;pyh
+	mov temp,xl ;pyh
 	rcall mmcByte
 	ldi temp,0  ;pyl
 	rcall mmcByte
@@ -1105,14 +1591,14 @@ mmcReadSect:
 	rcall mmcWaitResp
 
 	;Read sector to AVR RAM
-	ldi zl,low(sectbuff)
-	ldi zh,high(sectbuff)
+	ldi zl,low(hostbuf)
+	ldi zh,high(hostbuf)
 mmcreadloop:
 	rcall mmcByteNoSend
 	st z+,temp
-	cpi zl,low(sectbuff+512)
+	cpi zl,low(hostbuf+512)
 	brne mmcreadloop
-	cpi zh,high(sectbuff+512)
+	cpi zh,high(hostbuf+512)
 	brne mmcreadloop
 
 	;CRC
@@ -1126,8 +1612,8 @@ mmcreadloop:
 	ret
 
 
-;Call this with adrh:adrl = sector number
-;16bit lba address means a max reach of 32M.
+;Call this with yh:yl:xh:xl = sector number
+;
 mmcWriteSect:
 	ldi temp,0x50
 	out SPCR,temp
@@ -1137,14 +1623,14 @@ mmcWriteSect:
 
 	ldi temp,0x58	;cmd (write sector)
 	rcall mmcByte
-	ldi temp,0
-	lsl adrl
-	rol adrh
-	rol temp
+	lsl	xl			;convert to byte address (*512)
+	rol	xh
+	rol 	yl
+	mov	temp,yl
 	rcall mmcByte
-	mov temp,adrh ;pxl
+	mov temp,xh ;pxl
 	rcall mmcByte
-	mov temp,adrl ;pyh
+	mov temp,xl ;pyh
 	rcall mmcByte
 	ldi temp,0  ;pyl
 	rcall mmcByte
@@ -1162,315 +1648,88 @@ mmcWriteSect:
 	rcall mmcByte
 
 	;Write sector from AVR RAM
-	ldi zl,low(sectbuff)
-	ldi zh,high(sectbuff)
+	ldi zl,low(hostbuf)
+	ldi zh,high(hostbuf)
 mmcwriteloop:
 	ld temp,z+
 	rcall mmcByte
-	cpi zl,low(sectbuff+512)
+	cpi zl,low(hostbuf+512)
 	brne mmcwriteloop
-	cpi zh,high(sectbuff+512)
+	cpi zh,high(hostbuf+512)
 	brne mmcwriteloop
 
 	;CRC
 	rcall mmcByteNoSend
-	rcall mmcByteNoSend
-
-	;Status. Ignored for now.
-	rcall mmcByteNoSend
-
-;Wait till the mmc has written everything
-mmcwaitwritten:
-	rcall mmcByteNoSend
-	cpi temp,0xff
-	brne mmcwaitwritten
-
-	sbi P_MMC_CS,mmc_cs
-	rcall mmcByteNoSend
-
-	out SPCR,_0
-	ret
-
-
-;Set up wdt to time out after 1 sec.
-resetAVR:
-	cli
-#if defined __ATmega8__
-	ldi temp,(1<<WDCE)
-	out WDTCSR,temp
-	ldi temp,(1<<WDCE) | (1<<WDE) | (110<<WDP0)
-	out WDTCSR,temp
-#else
-	ldi temp,(1<<WDCE)
-	sts WDTCSR,temp
-	ldi temp,(1<<WDCE) | (1<<WDE) | (110<<WDP0)
-	sts WDTCSR,temp
-#endif
-resetwait:
-	rjmp resetwait
-
-
-; ------------------ DRAM routines -------------
-
-; TODO: 
-
-#if DRAM_DQ_ORDER == 1
- #define CLASSIC_DRAM 0
-#else
- #define CLASSIC_DRAM 1		/* Change manualy, if you want new hw w/ old sw */
-#endif
-
-
-#if DRAM_DQ_ORDER == 0
- #if CLASSIC_DRAM == 1
-   #error "Old harware can not work with new software!"
- #endif
-#endif
-
-; ****************************************************************************
-
-#if CLASSIC_DRAM
-
-; ********************** DRAM routines from Sprite_tm ************************
-
-;Sends the address in zh:zl to the ram
-dram_setaddr:
-	push temp
-	in temp,portd
-	andi temp,0x17
-	out portd,temp
-	in temp,portb
-	andi temp,0xE0
-	out portb,temp
-	sbrc zl,0
-	 sbi portb,ram_a0
-	sbrc zl,1
-	 sbi portb,ram_a1
-	sbrc zl,2
-	 sbi portb,ram_a2
-	sbrc zl,3
-	 sbi portb,ram_a3
-	sbrc zl,4
-	 sbi portb,ram_a4
-	sbrc zl,5
-	 sbi portd,ram_a5
-	sbrc zl,6
-	 sbi portd,ram_a6
-	sbrc zl,7
-	 sbi portd,ram_a7
-	sbrc zh,0
-	 sbi portd,ram_a8
-	pop temp
-	ret
-
-dram_getnibble:
-	andi temp,0xf0
-	sbic pinc,ram_d0
-	 ori temp,0x1
-	sbic pinc,ram_d1
-	 ori temp,0x2
-	sbic pinc,ram_d2
-	 ori temp,0x4
-	sbic pinc,ram_d3
-	 ori temp,0x8
-	ret
-
-dram_sendnibble:
-	push temp2
-	in temp2,portc
-	andi temp2,~RAM_DQ_MASK
-
-	sbrc temp,0
-	 ori temp2,(1<<ram_d0)
-	sbrc temp,1
-	 ori temp2,(1<<ram_d1)
-	sbrc temp,2
-	 ori temp2,(1<<ram_d2)
-	sbrc temp,3
-	 ori temp2,(1<<ram_d3)
-
-	out portc,temp2
-	pop temp2
-	ret
-
-
-;Loads the byte on address adrh:adrl into temp.
-dram_read:
-	cli
-	mov zl,adrh
-	ldi zh,0
-	mov temp2,adrl
-	lsl temp2
-	rol zl
-	rol zh
-	;z=addr[15-7]
-	rcall dram_setaddr
-	cbi portb,ram_ras
-
-	ldi zh,0
-	mov zl,adrl
-	andi zl,0x7F
-	rcall dram_setaddr
-	nop
-	cbi portc,ram_cas
-	nop
-	nop
-	cbi portd,ram_oe
-	nop
-	rcall dram_getnibble	
-	sbi portd,ram_oe
-	swap temp
-	sbi portc,ram_cas
-
-	ldi zh,0
-	mov zl,adrl
-	ori zl,0x80
-	rcall dram_setaddr
-	nop
-	cbi portc,ram_cas
-	nop
-	cbi portd,ram_oe
-	nop
-	nop
-	rcall dram_getnibble	
-
-	sbi portd,ram_oe
-	sbi portc,ram_cas
-	sbi portb,ram_ras
-	sei
-	ret
-
-;Writes the byte in temp to  adrh:adrl
-dram_write:
-	cli
-
-	in temp2,ddrc
-	ori temp2,RAM_DQ_MASK
-	out ddrc,temp2
-
-	rcall dram_sendnibble
+	rcall mmcByteNoSend
 
-	mov zl,adrh
-	ldi zh,0
-	mov temp2,adrl
-	lsl temp2
-	rol zl
-	rol zh
-	;z=addr[15-7]
-	rcall dram_setaddr
-	nop
-	nop
-	cbi portb,ram_ras
+	;Status. Ignored for now.
+	rcall mmcByteNoSend
 
-	ldi zh,0
-	mov zl,adrl
-	ori zl,0x80
-	rcall dram_setaddr
-	nop
-	nop
-	cbi portc,ram_cas
-	nop
-	nop
-	cbi portc,ram_w
-	nop
-	nop
-	nop
-	sbi portc,ram_w
-	sbi portc,ram_cas
+;Wait till the mmc has written everything
+mmcwaitwritten:
+	rcall mmcByteNoSend
+	cpi temp,0xff
+	brne mmcwaitwritten
 
+	sbi P_MMC_CS,mmc_cs
+	rcall mmcByteNoSend
 
-	ldi zh,0
-	mov zl,adrl
-	andi zl,0x7F
-	rcall dram_setaddr
-	swap temp
-	rcall dram_sendnibble
-	cbi portc,ram_cas
-	nop
-	nop
-	cbi portc,ram_w
-	nop
-	nop
-	sbi portc,ram_w
-	nop
-	nop
-	sbi portc,ram_cas
-	sbi portb,ram_ras
-
-	in temp,ddrc
-	andi temp,~RAM_DQ_MASK
-	out ddrc,temp
-	in temp,portc
-	andi temp,~RAM_DQ_MASK
-	out portc,temp
-	sei
+	out SPCR,_0
 	ret
-#endif  /* CLASSIC_DRAM == 1 */
 
-; ****************************************************************************
 
-#if ! CLASSIC_DRAM
+;Set up wdt to time out after 1 sec.
+resetAVR:
+	cli
+	ldi temp,(1<<WDCE)
+	outm8 WDTCSR,temp
+	ldi temp,(1<<WDCE) | (1<<WDE) | (110<<WDP0)
+	outm8 WDTCSR,temp
+resetwait:
+	rjmp resetwait
 
-; ***************************** New DRAM routines ****************************
+; ------------------ DRAM routines -------------
 
-;todo: see below
+; DRAM_SETADDR val, low_and_mask, low_or_mask, high_and_mask, high_or_mask
 .macro DRAM_SETADDR
-#if 1
-	in temp,P_AL
-	andi temp,~RAM_AL_MASK
-	sbrc @0,0
-	 ori temp,(1<<ram_a0)
-	sbrc @0,1
-	 ori temp,(1<<ram_a1)
-	sbrc @0,2
-	 ori temp,(1<<ram_a2)
-	sbrc @0,3
-	 ori temp,(1<<ram_a3)
-	sbrc @0,4
-	 ori temp,(1<<ram_a4)
+	mov temp,@0
+.if low(@1) != 0xff
+	andi temp,@1
+.endif
+.if  low(@2) != 0
+	ori temp, @2
+.endif
 	out P_AL,temp
-#else
-	out PORTB,@0
-#endif
-
-	in temp,P_AH
-	andi temp,~RAM_AH_MASK
-	sbrc @0,5
-	 ori temp,(1<<ram_a5)
-	sbrc @0,6
-	 ori temp,(1<<ram_a6)
-	sbrc @0,7
-	 ori temp,(1<<ram_a7)
+	
+	mov temp,@0
+.if low(@3) != 0xff
+	andi temp,@3
+.endif
+	ori temp, @4 | (1<<mmc_cs)
 	out P_AH,temp
 .endm
-	ret
 
-
-;Loads the byte on address adrh:adrl into temp.
-;must not alter adrh:adrl
+;Loads the byte on address xh:xl into temp.
+;must not alter xh:xl
 
 dram_read:
 	cli
-	cbi P_A8,ram_a8
-	DRAM_SETADDR adrh
+	DRAM_SETADDR xh, ~0,(1<<ram_ras), ~(1<<ram_a8), (1<<ram_oe)
 	cbi P_RAS,ram_ras
-
-	DRAM_SETADDR adrl
+	DRAM_SETADDR xl, ~(1<<ram_ras),0, ~((1<<ram_oe)), (1<<ram_a8)
 	cbi P_CAS,ram_cas
-	cbi P_OE,ram_oe
-	nop
-	nop
+	cbi P_A8,ram_a8
+	dram_wait DRAM_WAITSTATES	;
 	in  temp,P_DQ-2		; PIN
 	sbi P_CAS,ram_cas
 
-	sbi P_A8,ram_a8
 	cbi P_CAS,ram_cas
 	andi temp,0x0f
 	swap temp
+	dram_wait DRAM_WAITSTATES	;
 	in  temp2,P_DQ-2	; PIN
 	andi temp2,0x0f
 	or  temp,temp2
-	swap temp
 
 	sbi P_OE,ram_oe
 	sbi P_CAS,ram_cas
@@ -1478,9 +1737,66 @@ dram_read:
 	sei
 	ret
 
+#if DRAM_WORD_ACCESS
+dram_read_w:
+	cpi xl,255
+	brne dram_read_w1
+	
+	rcall dram_read
+	push temp
+	adiw xl,1
+	rcall dram_read
+	mov temp2,temp
+	pop temp
+	ret	
+
+dram_read_w1:
+	cli
+	DRAM_SETADDR xh, ~0,(1<<ram_ras), ~(1<<ram_a8),(1<<ram_oe)
+	cbi P_RAS,ram_ras
+	DRAM_SETADDR xl, ~(1<<ram_ras),0, ~((1<<ram_oe)), (1<<ram_a8)
+	cbi P_CAS,ram_cas
+	cbi P_A8,ram_a8
+	nop
+	in  temp,P_DQ-2		; PIN
+	sbi P_CAS,ram_cas
+	cbi P_CAS,ram_cas
+	andi temp,0x0f
+	swap temp
+	nop
+	in  temp2,P_DQ-2	; PIN
+	sbi P_CAS,ram_cas
+	andi temp2,0x0f
+	or  temp,temp2
+	
+;	push temp
+	mov _wl,temp
+	inc xl
+	DRAM_SETADDR xl, ~(1<<ram_ras),0, ~((1<<ram_oe)), (1<<ram_a8)
+	cbi P_CAS,ram_cas
+	cbi P_A8,ram_a8
+	nop
+	in  temp,P_DQ-2		; PIN
+	sbi P_CAS,ram_cas
+	cbi P_CAS,ram_cas
+	andi temp,0x0f
+	swap temp
+	nop
+	in  temp2,P_DQ-2	; PIN
+	sbi P_CAS,ram_cas
+	andi temp2,0x0f
+	or  temp2,temp
+;	pop temp
+	mov temp,_wl
+
+	sbi P_OE,ram_oe
+	sbi P_RAS,ram_ras
+	sei
+	ret
+#endif
 
-;Writes the byte in temp to  adrh:adrl
-;must not alter adrh:adrl
+;Writes the byte in temp to  xh:xl
+;must not alter xh:xl
 
 dram_write:
 	cli
@@ -1491,11 +1807,9 @@ dram_write:
 	andi temp,RAM_DQ_MASK & ~(1<<ram_w)
 	ori temp,(1<<ram_cas)
 	out PORTC,temp
-
-	cbi PORTD,ram_a8
-	DRAM_SETADDR adrh
+	DRAM_SETADDR xh, ~0,(1<<ram_ras), ~(1<<ram_a8),(1<<ram_oe)
 	cbi P_RAS,ram_ras
-	DRAM_SETADDR adrl
+	DRAM_SETADDR xl, ~(1<<ram_ras),0, ~((1<<ram_a8)),(1<<ram_oe)
 	cbi PORTC,ram_cas
 	sbi PORTC,ram_cas
 
@@ -1515,13 +1829,81 @@ dram_write:
 	sei
 	ret
 
-#endif  /* CLASSIC_DRAM == 0 */
+#if DRAM_WORD_ACCESS
+dram_write_w:
+	cpi xl,255
+	brne dram_write_w1
+	
+	push temp2
+	rcall dram_write
+	pop temp
+	adiw xl,1
+	rcall dram_write
+	ret	
+
+dram_write_w1:
+	cli
+	push temp2
+	ldi temp2,RAM_DQ_MASK | (1<<ram_w) | (1<<ram_cas)
+	out DDRC,temp2
+
+	mov  temp2,temp
+	andi temp,RAM_DQ_MASK & ~(1<<ram_w)
+	ori temp,(1<<ram_cas)
+	out PORTC,temp
+
+	DRAM_SETADDR xh, ~0,(1<<ram_ras), ~(1<<ram_a8),(1<<ram_oe)
+	cbi P_RAS,ram_ras
+	DRAM_SETADDR xl, ~(1<<ram_ras),0, ~((1<<ram_a8)),(1<<ram_oe)
+	cbi PORTC,ram_cas
+	sbi PORTC,ram_cas
+
+	sbi PORTD,ram_a8
+	swap temp2
+
+	andi temp2,RAM_DQ_MASK & ~(1<<ram_w)
+	ori temp2,(1<<ram_cas)
+	out PORTC,temp2
+
+	cbi PORTC,ram_cas
+	sbi PORTC,ram_cas
+
+	pop temp
+	inc xl
+	mov  temp2,temp
+	andi temp,RAM_DQ_MASK & ~(1<<ram_w)
+	ori temp,(1<<ram_cas)
+	out PORTC,temp
+
+	DRAM_SETADDR xl, ~(1<<ram_ras),0, ~((1<<ram_a8)),(1<<ram_oe)
+	cbi PORTC,ram_cas
+	sbi PORTC,ram_cas
+
+	sbi PORTD,ram_a8
+	swap temp2
+
+	andi temp2,RAM_DQ_MASK & ~(1<<ram_w)
+	ori temp2,(1<<ram_cas)
+	out PORTC,temp2
+	cbi PORTC,ram_cas
+
+	sbi P_RAS,ram_ras
+
+	ldi temp,~RAM_DQ_MASK | (1<<ram_w) | (1<<ram_cas)
+	out DDRC,temp
+	out PORTC,temp
+	sei
+	ret
+#endif
 
 ; ****************************************************************************
 
 ; refresh interupt; exec 2 cbr cycles
-refrint:
-				;4      CAS  RAS  
+refrint:			;4
+
+	sbis P_RAS,ram_ras	;2
+	reti
+				;       CAS  RAS  
 	cbi P_CAS,ram_cas	;2       1|   1|  
 				;        1|   1|  
 	cbi P_RAS,ram_ras	;2      |0    1|  
@@ -1530,6 +1912,7 @@ refrint:
 ;	nop			;1      |0   |0   
 	sbi P_RAS,ram_ras	;2      |0   |0   
 				;       |0   |0   
+	dram_wait DRAM_WAITSTATES-1	;
 ;	nop			;1      |0   |0   
 	cbi P_RAS,ram_ras	;2      |0    1|  
 				;       |0    1|  
@@ -1539,9 +1922,8 @@ refrint:
 				;        1|   1|  
 	reti			;4  --> 21 cycles
 
-; ****************************************************************************
 
-; ------------- system timer 10ms ---------------
+; ------------- system timer 1ms ---------------
     .dseg
 
 delay_timer:
@@ -1730,74 +2112,66 @@ ts_loop:
 ;
 	
 timer_print:
-	push	adrh
-	push	adrl
-	push	oph
-	push	opl
+	push	yh
+	push	yl
 	ldi	zl,low(timer_ms)
 	ldi	zh,high(timer_ms)
 
 ; put ms on stack (16 bit)
 
 	cli
-	ldd	adrl,z+timerofs
+	ldd	yl,z+timerofs
 	ld	temp2,z+
-	sub	adrl,temp2
-	ldd	adrh,z+timerofs
+	sub	yl,temp2
+	ldd	yh,z+timerofs
 	ld	temp2,z+
-	sbc	adrh,temp2
+	sbc	yh,temp2
 	brsh	tp_s
 	
-	subi	adrl,low(-1000)
-	sbci	adrh,high(-1000)
+	subi	yl,low(-1000)
+	sbci	yh,high(-1000)
 	sec	
 tp_s:
-	push	adrh
-	push	adrl
+	push	yh
+	push	yl
 
-; 
-	
 	ldd	temp,z+timerofs
-	ld	adrl,z+
-	sbc	temp,adrl
+	ld	yl,z+
+	sbc	temp,yl
 
 	ldd	temp2,z+timerofs
-	ld	adrh,z+
-	sbc	temp2,adrh
+	ld	yh,z+
+	sbc	temp2,yh
 
-	ldd	opl,z+timerofs
-	ld	adrl,z+
-	sbc	opl,adrl
+	ldd	temp3,z+timerofs
+	ld	yl,z+
+	sbc	temp3,yl
 
 	sei
-	ldd	oph,z+timerofs
-	ld	adrh,z+
-	sbc	oph,adrh
+	ldd	temp4,z+timerofs
+	ld	yh,z+
+	sbc	temp4,yh
 	
 	rcall printstr
 	.db 13,"Timer running. Elapsed: ",0
 	rcall	print_ultoa
 
 	rcall printstr
-	.db ",",0
-	ldi	opl,0
-	ldi	oph,0
+	.db ".",0
 	pop	temp
 	pop	temp2
+	ldi	temp3,0
+	ldi	temp4,0
 	rcall	print_ultoa
 	rcall printstr
 	.db "s.",0,0
 
-	pop	opl
-	pop	oph
-	pop	adrl
-	pop	adrh
+	pop	yl
+	pop	yh
 	ret
 	
 uptime_print:
 
-	push	oph
-	push	opl
 	ldi	zl,low(cnt_1ms)
 	ldi	zh,high(cnt_1ms)
 	
@@ -1809,9 +2183,9 @@ uptime_print:
 	
 	ld	temp,z+
 	ld	temp2,z+
-	ld	opl,z+
+	ld	temp3,z+
 	sei
-	ld	oph,z+
+	ld	temp4,z+
 	
 	rcall printstr
 	.db 13,"Uptime: ",0
@@ -1820,16 +2194,14 @@ uptime_print:
 	rcall printstr
 	.db ",",0
 
-	ldi	opl,0
-	ldi	oph,0
+	ldi	temp3,0
+	ldi	temp4,0
 	pop	temp2
 	pop	temp
 	rcall print_ultoa
 	rcall printstr
 	.db "s.",0,0
 
-	pop	opl
-	pop	oph
 	ret
 
 
@@ -1837,53 +2209,61 @@ uptime_print:
 ; --------------- Debugging stuff ---------------
 
 ;Print a unsigned lonng value to the uart
-; oph:opl:temp2:temp = value
+; temp4:temp3:temp2:temp = value
 
 print_ultoa:
-	push	adrh
-	push	adrl
-	push	insdech
+	push	yh
+	push	yl
+	push	z_flags
+	push	temp4
+	push	temp3
+	push	temp2
+	push	temp
 				
-	clr	adrl		;adrl = stack level
+	clr	yl		;yl = stack level
 
-ultoa1:	ldi	insdech, 32		;adrh = oph:temp % 10
-	clr	adrh		;oph:temp /= 10
+ultoa1:	ldi	z_flags, 32	;yh = temp4:temp % 10
+	clr	yh		;temp4:temp /= 10
 ultoa2:	lsl	temp	
 	rol	temp2	
-	rol	opl	
-	rol	oph	
-	rol	adrh	
-	cpi	adrh,10	
+	rol	temp3	
+	rol	temp4	
+	rol	yh	
+	cpi	yh,10	
 	brcs	ultoa3	
-	subi	adrh,10	
+	subi	yh,10	
 	inc	temp
-ultoa3:	dec	insdech	
+ultoa3:	dec	z_flags	
 	brne	ultoa2
-	cpi	adrh, 10	;adrh is a numeral digit '0'-'9'
-	subi	adrh, -'0'
-	push	adrh		;Stack it
-	inc	adrl	
-	cp	temp,_0	;Repeat until oph:temp gets zero
+	cpi	yh, 10	;yh is a numeral digit '0'-'9'
+	subi	yh, -'0'
+	push	yh		;Stack it
+	inc	yl	
+	cp	temp,_0		;Repeat until temp4:temp gets zero
 	cpc	temp2,_0
-	cpc	opl,_0
-	cpc	oph,_0
+	cpc	temp3,_0
+	cpc	temp4,_0
 	brne	ultoa1	
 	
 	ldi	temp, '0'
-ultoa5:	cpi	adrl,3		; at least 3 digits (ms)
+ultoa5:	cpi	yl,3		; at least 3 digits (ms)
 	brge	ultoa6
 	push	temp	
-	inc	adrl
+	inc	yl
 	rjmp	ultoa5
 
 ultoa6:	pop	temp		;Flush stacked digits
 	rcall	uartputc
-	dec	adrl	
+	dec	yl	
 	brne	ultoa6	
 
-	pop	insdech
-	pop	adrl
-	pop	adrh
+	pop	temp
+	pop	temp2
+	pop	temp3
+	pop	temp4
+	pop	z_flags
+	pop	yl
+	pop	yh
 	ret
 
 
@@ -1911,15 +2291,21 @@ printhex:
 	rcall printhexn
 	ret
 
-;Prints the zero-terminated string following the call statement. WARNING: Destroys temp.
+;Prints the zero-terminated string following the call statement. 
+
 printstr:
-	pop zh
-	pop zl
-	push temp
+	push	zh
+	push	zl
+	push	yh
+	push	yl
+	push	temp
+	in	yh,sph
+	in	yl,spl
+	ldd	zl,y+7
+	ldd	zh,y+6
 
 	lsl zl
 	rol zh
-
 printstr_loop:
 	lpm temp,z+
 	cpi temp,0
@@ -1936,12 +2322,15 @@ printstr_end:
 	lsr zh
 	ror zl
 
-	pop temp
-	push zl
-	push zh
+	std	y+7,zl
+	std	y+6,zh
+	pop	temp
+	pop	yl
+	pop	yh
+	pop	zl
+	pop	zh
 	ret
 	
-
 ; --------------- AVR HW <-> Z80 periph stuff ------------------
 
 .equ memReadByte	=	dram_read
@@ -1956,6 +2345,7 @@ printstr_end:
 	.dseg
 	
 #define RXBUFMASK  RXBUFSIZE-1
+#define TXBUFMASK  TXBUFSIZE-1
 
 rxcount:
 	.byte	1
@@ -1963,10 +2353,18 @@ rxidx_w:
 	.byte	1
 rxidx_r:
 	.byte	1
+txcount:
+	.byte	1
+txidx_w:
+	.byte	1
+txidx_r:
+	.byte	1
 rxfifo:
 	.byte	RXBUFSIZE
-	.byte	0
+txfifo:
+	.byte	TXBUFSIZE
 
+ramtop:		
 	.cseg
 
 ; Save received character in a circular buffer. Do nothing if buffer overflows.
@@ -1977,11 +2375,7 @@ rxint:
 	push	temp
 	push	zh
 	push	zl
-#ifdef __ATmega8__	
-	in	temp,UDR
-#else
-	lds	temp,UDR0
-#endif
+	inm8	temp,RXTXDR0
 	lds	zh,rxcount		;if rxcount < RXBUFSIZE
 	cpi	zh,RXBUFSIZE		;   (room for at least 1 char?)
 	brsh	rxi_ov			; 
@@ -2012,7 +2406,7 @@ rxi_ov:					;endif
 uartgetc:
 	lds	temp,rxcount		; Number of characters in buffer
 	tst	temp
-	breq	uartgetc
+	breq	uartgetc		;Wait for char
 	
 	push	zh
 	push	zl
@@ -2035,24 +2429,74 @@ uartgetc:
 	pop	zh
 	ret
 
+txint:	
+	push	temp
+	in	temp,sreg
+	push	temp
+	lds	temp,txcount		;if txcount != 0
+	tst	temp			;
+	breq	txi_e			; 
+
+	dec	temp			;
+	sts	txcount,temp		;   --txcount
+	push	zh			;
+	push	zl			;
+	ldi	zl,low(txfifo)		;  
+	ldi	zh,high(txfifo)		;
+	lds	temp,txidx_r		;
+	add	zl,temp			;
+	brcc	PC+2			;
+	inc	zh			;
+	inc	temp			;
+	andi	temp,TXBUFMASK		;
+	sts	txidx_r,temp		;
+	ld	temp,z
+	outm8 RXTXDR0,temp
+	pop	zl
+	pop	zh
+txi_e:					;endif
+	lds	temp,txcount
+	tst	temp
+	brne	txi_x
+	ldi temp, (1<<TXEN0) | (1<<RXEN0) | (1<<RXCIE0)
+	outm8 UCSR0B,temp
+txi_x:
+	pop	temp
+	out	sreg,temp
+	pop	temp
+	reti
 
 
 ;Sends a char from temp to the uart. 
 uartputc:
-#if defined __ATmega8__
-uartputc_l:
-	sbis UCSRA,UDRE
-	 rjmp uartputc_l
-    out UDR,temp
-#else
-	push temp
-uartputc_l:
-	lds temp,UCSR0A
-	sbrs temp,UDRE0
-	 rjmp uartputc_l
-	pop temp
-	sts UDR0,temp
-#endif
+	push	zh
+	push	zl
+	push	temp
+putc_l:
+	lds	temp,txcount		;do {
+	cpi	temp,TXBUFSIZE		;
+	brsh	putc_l			;} while (txcount >= TXBUFSIZE)
+
+	ldi	zl,low(txfifo)		;  
+	ldi	zh,high(txfifo)		;
+	lds	temp,txidx_w		;
+	add	zl,temp			;
+	brcc	PC+2			;
+	inc	zh			;
+	inc	temp			;
+	andi	temp,TXBUFMASK		;
+	sts	txidx_w,temp		;   txidx_w = ++txidx_w % TXBUFSIZE
+	pop	temp			;
+	st	z,temp			;   txfifo[txidx_w] = char
+	cli
+	lds	zl,txcount
+	inc	zl
+	sts	txcount,zl
+	ldi	zl, (1<<UDRIE0) | (1<<TXEN0) | (1<<RXEN0) | (1<<RXCIE0)
+	outm8	UCSR0B,zl
+	sei
+	pop	zl
+	pop	zh
 	ret
 
 ; ------------ Fetch phase stuff -----------------
@@ -2139,18 +2583,15 @@ do_fetch_af:
 	ret
 
 do_fetch_bc:
-	mov opl,z_c
-	mov oph,z_b
+	movw opl,z_c
 	ret
 
 do_fetch_de:
-	mov opl,z_e
-	mov oph,z_d
+	movw opl,z_e
 	ret
 
 do_fetch_hl:
-	mov opl,z_l
-	mov oph,z_h
+	movw opl,z_l
 	ret
 
 do_fetch_sp:
@@ -2158,57 +2599,53 @@ do_fetch_sp:
 	ret
 
 do_fetch_mbc:
-	mov adrh,z_b
-	mov adrl,z_c
+	movw xl,z_c
 	rcall memReadByte
 	mov opl,temp
 	ret
 
 do_fetch_mde:
-	mov adrh,z_d
-	mov adrl,z_e
+	movw xl,z_e
 	rcall memReadByte
 	mov opl,temp
 	ret
 
 do_fetch_mhl:
-	mov adrh,z_h
-	mov adrl,z_l
+	movw xl,z_l
 	rcall memReadByte
 	mov opl,temp
 	ret
 
 do_fetch_msp:
-	movw adrl,z_spl
+	movw xl,z_spl
 #if DRAM_WORD_ACCESS
 	rcall memReadWord
 	movw opl,temp
 #else
 	rcall memReadByte
 	mov opl,temp
-
-	adiw adrl,1
+	adiw xl,1
 	rcall memReadByte
 	mov oph,temp
 #endif	
 	ret
 
 do_fetch_dir8:
-	movw adrl,z_pcl
+	movw xl,z_pcl
 	rcall memReadByte
 	adiw z_pcl,1
 	mov opl,temp
 	ret
 
 do_fetch_dir16:
-	movw adrl,z_pcl
+	movw xl,z_pcl
 #if DRAM_WORD_ACCESS
 	rcall memReadWord
 	movw opl,temp
 #else
 	rcall memReadByte
 	mov opl,temp
-	adiw adrl,1
+	adiw xl,1
 	rcall memReadByte
 	mov oph,temp
 #endif	
@@ -2216,9 +2653,9 @@ do_fetch_dir16:
 	ret
 
 do_fetch_rst:
-	movw adrl,z_pcl
-	subi adrl,1
-	sbci adrh,0
+	movw xl,z_pcl
+	subi xl,1
+	sbci xh,0
 	rcall memReadByte
 	andi temp,0x38
 	ldi oph,0
@@ -2328,35 +2765,32 @@ do_store_hl:
 	ret
 
 do_store_mbc:
-	mov adrh,z_b
-	mov adrl,z_c
+	movw xl,z_c
 	mov temp,opl
 	rcall memWriteByte
 	ret
 
 do_store_mde:
-	mov adrh,z_d
-	mov adrl,z_e
+	movw xl,z_e
 	mov temp,opl
 	rcall memWriteByte
 	ret
 
 do_store_mhl:
-	mov adrh,z_h
-	mov adrl,z_l
+	movw xl,z_l
 	mov temp,opl
 	rcall memWriteByte
 	ret
 
 do_store_msp:
-	movw adrl,z_spl
+	movw xl,z_spl
 #if DRAM_WORD_ACCESS
 	movw temp,opl
 	rcall memWriteWord
 #else
 	mov temp,opl
 	rcall memWriteByte
-	adiw adrl,1
+	adiw xl,1
 	mov temp,oph
 	rcall memWriteByte
 #endif
@@ -2385,7 +2819,7 @@ do_store_call:
 	ret
 
 do_store_am:
-	movw adrl,opl
+	movw xl,opl
 	mov temp,z_a
 	rcall memWriteByte
 	ret
@@ -2434,6 +2868,9 @@ do_store_am:
 .equ OP_DI		= (37<<10)
 .equ OP_EI		= (38<<10)
 .equ OP_INV		= (39<<10)
+.equ OP_CPFA	= (40<<10)
+.equ OP_INCA	= (41<<10)
+.equ OP_DECA	= (42<<10)
 
 opjumps:
 	rjmp do_op_nop
@@ -2476,6 +2913,9 @@ opjumps:
 	rjmp do_op_di
 	rjmp do_op_ei
 	rjmp do_op_inv
+	rjmp do_op_cpfa
+	rjmp do_op_inca
+	rjmp do_op_deca
 
 
 ;How the flags are supposed to work:
@@ -2661,13 +3101,13 @@ opjumps:
 ;----------------------------------------------------------------
 
 
-.equ AVR_T = 6
-.equ AVR_H = 5
-.equ AVR_S = 4
-.equ AVR_V = 3
-.equ AVR_N = 2
-.equ AVR_Z = 1
-.equ AVR_C = 0
+.equ AVR_T = SREG_T
+.equ AVR_H = SREG_H
+.equ AVR_S = SREG_S
+.equ AVR_V = SREG_V
+.equ AVR_N = SREG_N
+.equ AVR_Z = SREG_Z
+.equ AVR_C = SREG_C
 
 ;------------------------------------------------;
 ; Move single bit between two registers
@@ -2692,7 +3132,6 @@ opjumps:
 	mov	zl,@2		       
 	lpm	@0,z	
 .endm
-
 .macro	do_z80_flags_HP
 #if EM_Z80
 	bmov	z_flags, ZFL_P, temp, AVR_V
@@ -2756,15 +3195,27 @@ do_op_nop:
 ;
 ; 
 do_op_inc:
-	ldi	temp,1
-	add	opl,temp
+	inc	opl
+#if EM_Z80
 	in	temp, sreg
+#endif
 	andi	z_flags,(1<<ZFL_H)|(1<<ZFL_C)	; preserve C-, and H-flag
 	ldpmx	temp2, sz53p_tab, opl
 	or	z_flags,temp2		;
 	do_z80_flags_HP
 	ret
 
+do_op_inca:
+	inc	z_a
+#if EM_Z80
+	in	temp, sreg
+#endif
+	andi	z_flags,(1<<ZFL_H)|(1<<ZFL_C)	; preserve C-, and H-flag
+	ldpmx	temp2, sz53p_tab, z_a
+	or	z_flags,temp2		;
+	do_z80_flags_HP
+	ret
+
 ;----------------------------------------------------------------
 ;|Mnemonic  |SZHPNC|Description          |Notes                 |
 ;----------------------------------------------------------------
@@ -2777,8 +3228,10 @@ do_op_inc:
 ;
 ;
 do_op_dec:
-	subi	opl,1
+	dec	opl
+#if EM_Z80
 	in    temp, sreg
+#endif
 	andi	z_flags,(1<<ZFL_H)|(1<<ZFL_C)	; preserve C-, and H-flag
 	ldpmx	temp2, sz53p_tab, opl
 	or	z_flags,temp2		;
@@ -2786,6 +3239,17 @@ do_op_dec:
 	do_z80_flags_set_N
 	ret
 
+do_op_deca:
+	dec	z_a
+#if EM_Z80
+	in    temp, sreg
+#endif
+	andi	z_flags,(1<<ZFL_H)|(1<<ZFL_C)	; preserve C-, and H-flag
+	ldpmx	temp2, sz53p_tab, z_a
+	or	z_flags,temp2		;
+	do_z80_flags_HP
+	do_z80_flags_set_N
+	ret
 
 ;----------------------------------------------------------------
 ;|Mnemonic  |SZHPNC|Description          |Notes                 |
@@ -2795,7 +3259,8 @@ do_op_dec:
 ;
 ; 
 do_op_inc16:
-	adiw	opl,1
+	subi	opl,low(-1)
+	sbci	oph,high(-1)
 	ret
 
 ;----------------------------------------------------------------
@@ -2895,9 +3360,9 @@ do_op_rl:
 ;
 ;
 do_op_adda:
-	add opl,z_a
+	add z_a,opl
 	in temp,sreg
-	ldpmx	z_flags,sz53p_tab,opl		;S,Z,P flag
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,P flag
 	bmov	z_flags,ZFL_C, temp,AVR_C
 	do_z80_flags_HP
 	ret
@@ -2914,9 +3379,9 @@ do_op_adca:
 	clc
 	sbrc z_flags,ZFL_C
 	 sec
-	adc opl,z_a
+	adc z_a,opl
 	in temp,sreg
-	ldpmx	z_flags,sz53p_tab,opl		;S,Z,P
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,P
 	bmov	z_flags,ZFL_C, temp,AVR_C
 	do_z80_flags_HP
 	ret
@@ -2925,13 +3390,28 @@ do_op_adca:
 ;|Mnemonic  |SZHPNC|Description          |Notes                 |
 ;----------------------------------------------------------------
 ;|SUB s     |***V1*|Subtract             |A=A-s                 |
-;|CP s      |***V1*|Compare              |A-s                   |
 ;|----------|SZHP C|---------- 8080 ----------------------------|
 ;|SUB s     |***P *|Subtract             |A=A-s                 |
-;|CP s      |***P *|Compare              |A-s                   |
 
 ;
 do_op_subfa:
+	sub z_a,opl
+	in temp,sreg
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,P
+	bmov	z_flags,ZFL_C, temp,AVR_C
+	do_z80_flags_HP
+	do_z80_flags_set_N
+	ret
+
+;----------------------------------------------------------------
+;|Mnemonic  |SZHPNC|Description          |Notes                 |
+;----------------------------------------------------------------
+;|CP s      |***V1*|Compare              |A-s                   |
+;|----------|SZHP C|---------- 8080 ----------------------------|
+;|CP s      |***P *|Compare              |A-s                   |
+
+;
+do_op_cpfa:
 	mov temp,z_a
 	sub temp,opl
 	mov opl,temp
@@ -2951,14 +3431,12 @@ do_op_subfa:
 ;
 ;
 do_op_sbcfa:
-	mov temp,z_a
 	clc
 	sbrc z_flags,ZFL_C
 	 sec
-	sbc temp,opl
-	mov opl,temp
+	sbc z_a,opl
 	in temp,sreg
-	ldpmx	z_flags,sz53p_tab,opl		;S,Z,P
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,P
 	bmov	z_flags,ZFL_C, temp,AVR_C
 	do_z80_flags_HP
 	do_z80_flags_set_N
@@ -2973,8 +3451,8 @@ do_op_sbcfa:
 ;
 ; TODO H-Flag
 do_op_anda:
-	and opl,z_a				;
-	ldpmx	z_flags,sz53p_tab,opl		;S,Z,P,N,C
+	and z_a,opl				;
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,P,N,C
 	do_z80_flags_op_and
 	ret
 
@@ -2988,8 +3466,8 @@ do_op_anda:
 ;
 ; TODO: H-Flag
 do_op_ora:
-	or opl,z_a
-	ldpmx	z_flags,sz53p_tab,opl		;S,Z,H,P,N,C
+	or z_a,opl
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,H,P,N,C
 	do_z80_flags_op_or
 	ret
 
@@ -3002,8 +3480,8 @@ do_op_ora:
 ;
 ; TODO: H-Flag
 do_op_xora:
-	eor opl,z_a
-	ldpmx	z_flags,sz53p_tab,opl		;S,Z,H,P,N,C
+	eor z_a,opl
+	ldpmx	z_flags,sz53p_tab,z_a		;S,Z,H,P,N,C
 	do_z80_flags_op_or
 	ret
 
@@ -3031,15 +3509,14 @@ do_op_addhl:
 ;
 ;
 do_op_sthl: ;store hl to mem loc in opl:h
-	movw adrl,opl
+	movw xl,opl
 #if DRAM_WORD_ACCESS
-	mov temp,z_l
-	mov temp2,z_h
+	movw temp,z_l
 	rcall memWriteWord
 #else
 	mov temp,z_l
 	rcall memWriteByte
-	adiw adrl,1
+	adiw xl,1
 	mov temp,z_h
 	rcall memWriteByte
 #endif
@@ -3052,14 +3529,14 @@ do_op_sthl: ;store hl to mem loc in opl:h
 ;
 ; 
 do_op_rmem16:
-	movw adrl,opl
+	movw xl,opl
 #if DRAM_WORD_ACCESS
 	rcall memReadWord
 	movw opl,temp
 #else
 	rcall memReadByte
 	mov opl,temp
-	adiw adrl,1
+	adiw xl,1
 	rcall memReadByte
 	mov oph,temp
 #endif	
@@ -3072,7 +3549,7 @@ do_op_rmem16:
 ;
 ;
 do_op_rmem8:
-	movw adrl,opl
+	movw xl,opl
 	rcall memReadByte
 	mov opl,temp
 	ret
@@ -3244,7 +3721,7 @@ do_op_ccf:
 ;
 ;
 do_op_cpl:
-	com opl
+	com z_a
 	do_z80_flags_set_HN
 	ret
 
@@ -3257,17 +3734,17 @@ do_op_cpl:
 ;
 ;
 do_op_push16:
-	movw adrl,z_spl
-	subi adrl,2
-	sbci adrh,0
-	movw z_spl,adrl
+	movw xl,z_spl
+	subi xl,2
+	sbci xh,0
+	movw z_spl,xl
 #if DRAM_WORD_ACCESS	
 	movw temp,opl
 	rcall memWriteWord
 #else
 	mov temp,opl
 	rcall memWriteByte
-	adiw adrl,1
+	adiw xl,1
 	mov temp,oph
 	rcall memWriteByte
 #endif
@@ -3299,14 +3776,14 @@ do_op_push16:
 ;
 ;
 do_op_pop16:
-	movw adrl,z_spl
+	movw xl,z_spl
 #if DRAM_WORD_ACCESS
 	rcall memReadWord
 	movw opl,temp
 #else
 	rcall memReadByte
 	mov opl,temp
-	adiw adrl,1
+	adiw xl,1
 	rcall memReadByte
 	mov oph,temp
 #endif	
@@ -3315,6 +3792,7 @@ do_op_pop16:
 	add z_spl,temp
 	adc z_sph,_0
 
+
 .if STACK_DBG
 	rcall printstr
 	.db "Stack pop: val ",0
@@ -3376,8 +3854,8 @@ do_op_ei:
 do_op_ifnz:
 	sbrs z_flags, ZFL_Z
 	ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3391,8 +3869,8 @@ do_op_ifnz:
 do_op_ifz:
 	sbrc z_flags, ZFL_Z
 	ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3406,8 +3884,8 @@ do_op_ifz:
 do_op_ifnc:
 	sbrs z_flags, ZFL_C
 	ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3421,8 +3899,8 @@ do_op_ifnc:
 do_op_ifc:
 	sbrc z_flags, ZFL_C
 	ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3436,8 +3914,8 @@ do_op_ifc:
 do_op_ifpo:
 	sbrs z_flags, ZFL_P
 	ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3451,8 +3929,8 @@ do_op_ifpo:
 do_op_ifpe:
 	sbrc z_flags, ZFL_P
 	ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3466,8 +3944,8 @@ do_op_ifpe:
 do_op_ifp: ;sign positive, aka s=0
 	sbrs z_flags, ZFL_S
 	 ret
-	ldi insdech,0
-	ldi insdecl,0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3481,8 +3959,8 @@ do_op_ifp: ;sign positive, aka s=0
 do_op_ifm: ;sign negative, aka s=1
 	sbrc z_flags, ZFL_S
 	 ret
-	ldi insdech, 0
-	ldi insdecl, 0
+	clr insdech
+	clr insdecl
 	ret
 
 ;----------------------------------------------------------------
@@ -3599,7 +4077,6 @@ sz53p_tab:
 ; The table is made of 256 words. These 16-bit words consist of 
 ; the fetch operation (bit 0-4), the processing operation (bit 10-16) and the store 
 ; operation (bit 5-9).
-
 .org (PC+255) & 0xff00
 inst_table:
 .dw (FETCH_NOP  | OP_NOP	| STORE_NOP)	 ; 00		NOP
@@ -3649,7 +4126,7 @@ inst_table:
 .dw (FETCH_L	| OP_INC	| STORE_L  )	 ; 2C		INC L
 .dw (FETCH_L	| OP_DEC	| STORE_L  )	 ; 2D		DEC L
 .dw (FETCH_DIR8	| OP_NOP	| STORE_L  )	 ; 2E nn	LD L,n
-.dw (FETCH_A    | OP_CPL	| STORE_A  )	 ; 2F		CPL
+.dw (FETCH_NOP  | OP_CPL	| STORE_NOP)	 ; 2F		CPL
 .dw (FETCH_NOP	| OP_INV	| STORE_NOP)	 ; 30 oo	JR NC,o		(Z80)
 .dw (FETCH_DIR16| OP_NOP	| STORE_SP )	 ; 31 nn nn	LD SP,nn
 .dw (FETCH_DIR16| OP_NOP	| STORE_AM )	 ; 32 nn nn	LD (nn),A
@@ -3662,8 +4139,8 @@ inst_table:
 .dw (FETCH_SP	| OP_ADDHL	| STORE_HL )	 ; 39		ADD HL,SP
 .dw (FETCH_DIR16| OP_RMEM8	| STORE_A  )	 ; 3A nn nn	LD A,(nn)
 .dw (FETCH_SP	| OP_DEC16	| STORE_SP )	 ; 3B		DEC SP
-.dw (FETCH_A    | OP_INC	| STORE_A  )	 ; 3C		INC A
-.dw (FETCH_A    | OP_DEC	| STORE_A  )	 ; 3D		DEC A
+.dw (FETCH_NOP  | OP_INCA	| STORE_NOP)	 ; 3C		INC A
+.dw (FETCH_NOP  | OP_DECA	| STORE_NOP)	 ; 3D		DEC A
 .dw (FETCH_DIR8	| OP_NOP	| STORE_A  )	 ; 3E nn	LD A,n
 .dw (FETCH_NOP	| OP_CCF	| STORE_NOP)	 ; 3F		CCF (Complement Carry Flag, gvd)
 .dw (FETCH_B	| OP_NOP	| STORE_B  )	 ; 40		LD B,r
@@ -3730,77 +4207,77 @@ inst_table:
 .dw (FETCH_L	| OP_NOP	| STORE_A  )	 ; 7D		LD A,r
 .dw (FETCH_MHL	| OP_NOP	| STORE_A  )	 ; 7E		LD A,r
 .dw (FETCH_A    | OP_NOP	| STORE_A  )	 ; 7F		LD A,r
-.dw (FETCH_B	| OP_ADDA	| STORE_A  )	 ; 80		ADD A,r
-.dw (FETCH_C	| OP_ADDA	| STORE_A  )	 ; 81		ADD A,r
-.dw (FETCH_D	| OP_ADDA	| STORE_A  )	 ; 82		ADD A,r
-.dw (FETCH_E	| OP_ADDA	| STORE_A  )	 ; 83		ADD A,r
-.dw (FETCH_H	| OP_ADDA	| STORE_A  )	 ; 84		ADD A,r
-.dw (FETCH_L	| OP_ADDA	| STORE_A  )	 ; 85		ADD A,r
-.dw (FETCH_MHL	| OP_ADDA	| STORE_A  )	 ; 86		ADD A,r
-.dw (FETCH_A    | OP_ADDA	| STORE_A  )	 ; 87		ADD A,r
-.dw (FETCH_B	| OP_ADCA	| STORE_A  )	 ; 88		ADC A,r
-.dw (FETCH_C	| OP_ADCA	| STORE_A  )	 ; 89		ADC A,r
-.dw (FETCH_D	| OP_ADCA	| STORE_A  )	 ; 8A		ADC A,r
-.dw (FETCH_E	| OP_ADCA	| STORE_A  )	 ; 8B		ADC A,r
-.dw (FETCH_H	| OP_ADCA	| STORE_A  )	 ; 8C		ADC A,r
-.dw (FETCH_L	| OP_ADCA	| STORE_A  )	 ; 8D		ADC A,r
-.dw (FETCH_MHL	| OP_ADCA	| STORE_A  )	 ; 8E		ADC A,r
-.dw (FETCH_A    | OP_ADCA	| STORE_A  )	 ; 8F		ADC A,r
-.dw (FETCH_B	| OP_SUBFA	| STORE_A  )	 ; 90		SUB A,r
-.dw (FETCH_C	| OP_SUBFA	| STORE_A  )	 ; 91		SUB A,r
-.dw (FETCH_D	| OP_SUBFA	| STORE_A  )	 ; 92		SUB A,r
-.dw (FETCH_E	| OP_SUBFA	| STORE_A  )	 ; 93		SUB A,r
-.dw (FETCH_H	| OP_SUBFA	| STORE_A  )	 ; 94		SUB A,r
-.dw (FETCH_L	| OP_SUBFA	| STORE_A  )	 ; 95		SUB A,r
-.dw (FETCH_MHL	| OP_SUBFA	| STORE_A  )	 ; 96		SUB A,r
-.dw (FETCH_A    | OP_SUBFA	| STORE_A  )	 ; 97		SUB A,r
-.dw (FETCH_B	| OP_SBCFA	| STORE_A  )	 ; 98		SBC A,r
-.dw (FETCH_C	| OP_SBCFA	| STORE_A  )	 ; 99		SBC A,r
-.dw (FETCH_D	| OP_SBCFA	| STORE_A  )	 ; 9A		SBC A,r
-.dw (FETCH_E	| OP_SBCFA	| STORE_A  )	 ; 9B		SBC A,r
-.dw (FETCH_H	| OP_SBCFA	| STORE_A  )	 ; 9C		SBC A,r
-.dw (FETCH_L	| OP_SBCFA	| STORE_A  )	 ; 9D		SBC A,r
-.dw (FETCH_MHL	| OP_SBCFA	| STORE_A  )	 ; 9E		SBC A,r
-.dw (FETCH_A    | OP_SBCFA	| STORE_A  )	 ; 9F		SBC A,r
-.dw (FETCH_B	| OP_ANDA	| STORE_A  )	 ; A0		AND A,r
-.dw (FETCH_C	| OP_ANDA	| STORE_A  )	 ; A1		AND A,r
-.dw (FETCH_D	| OP_ANDA	| STORE_A  )	 ; A2		AND A,r
-.dw (FETCH_E	| OP_ANDA	| STORE_A  )	 ; A3		AND A,r
-.dw (FETCH_H	| OP_ANDA	| STORE_A  )	 ; A4		AND A,r
-.dw (FETCH_L	| OP_ANDA	| STORE_A  )	 ; A5		AND A,r
-.dw (FETCH_MHL	| OP_ANDA	| STORE_A  )	 ; A6		AND A,r
-.dw (FETCH_A    | OP_ANDA	| STORE_A  )	 ; A7		AND A,r
-.dw (FETCH_B	| OP_XORA	| STORE_A  )	 ; A8		XOR A,r
-.dw (FETCH_C	| OP_XORA	| STORE_A  )	 ; A9		XOR A,r
-.dw (FETCH_D	| OP_XORA	| STORE_A  )	 ; AA		XOR A,r
-.dw (FETCH_E	| OP_XORA	| STORE_A  )	 ; AB		XOR A,r
-.dw (FETCH_H	| OP_XORA	| STORE_A  )	 ; AC		XOR A,r
-.dw (FETCH_L	| OP_XORA	| STORE_A  )	 ; AD		XOR A,r
-.dw (FETCH_MHL	| OP_XORA	| STORE_A  )	 ; AE		XOR A,r
-.dw (FETCH_A    | OP_XORA	| STORE_A  )	 ; AF		XOR A,r
-.dw (FETCH_B	| OP_ORA	| STORE_A  )	 ; B0		OR A,r
-.dw (FETCH_C	| OP_ORA	| STORE_A  )	 ; B1		OR A,r
-.dw (FETCH_D	| OP_ORA	| STORE_A  )	 ; B2		OR A,r
-.dw (FETCH_E	| OP_ORA	| STORE_A  )	 ; B3		OR A,r
-.dw (FETCH_H	| OP_ORA	| STORE_A  )	 ; B4		OR A,r
-.dw (FETCH_L	| OP_ORA	| STORE_A  )	 ; B5		OR A,r
-.dw (FETCH_MHL	| OP_ORA	| STORE_A  )	 ; B6		OR A,r
-.dw (FETCH_A    | OP_ORA	| STORE_A  )	 ; B7		OR A,r
-.dw (FETCH_B	| OP_SUBFA	| STORE_NOP)	 ; B8		CP A,r
-.dw (FETCH_C	| OP_SUBFA	| STORE_NOP)	 ; B9		CP A,r
-.dw (FETCH_D	| OP_SUBFA	| STORE_NOP)	 ; BA		CP A,r
-.dw (FETCH_E	| OP_SUBFA	| STORE_NOP)	 ; BB		CP A,r
-.dw (FETCH_H	| OP_SUBFA	| STORE_NOP)	 ; BC		CP A,r
-.dw (FETCH_L	| OP_SUBFA	| STORE_NOP)	 ; BD		CP A,r
-.dw (FETCH_MHL	| OP_SUBFA	| STORE_NOP)	 ; BE		CP A,r
-.dw (FETCH_A    | OP_SUBFA	| STORE_NOP)	 ; BF	 	CP A,r
+.dw (FETCH_B	| OP_ADDA	| STORE_NOP)	 ; 80		ADD A,r
+.dw (FETCH_C	| OP_ADDA	| STORE_NOP)	 ; 81		ADD A,r
+.dw (FETCH_D	| OP_ADDA	| STORE_NOP)	 ; 82		ADD A,r
+.dw (FETCH_E	| OP_ADDA	| STORE_NOP)	 ; 83		ADD A,r
+.dw (FETCH_H	| OP_ADDA	| STORE_NOP)	 ; 84		ADD A,r
+.dw (FETCH_L	| OP_ADDA	| STORE_NOP)	 ; 85		ADD A,r
+.dw (FETCH_MHL	| OP_ADDA	| STORE_NOP)	 ; 86		ADD A,r
+.dw (FETCH_A    | OP_ADDA	| STORE_NOP)	 ; 87		ADD A,r
+.dw (FETCH_B	| OP_ADCA	| STORE_NOP)	 ; 88		ADC A,r
+.dw (FETCH_C	| OP_ADCA	| STORE_NOP)	 ; 89		ADC A,r
+.dw (FETCH_D	| OP_ADCA	| STORE_NOP)	 ; 8A		ADC A,r
+.dw (FETCH_E	| OP_ADCA	| STORE_NOP)	 ; 8B		ADC A,r
+.dw (FETCH_H	| OP_ADCA	| STORE_NOP)	 ; 8C		ADC A,r
+.dw (FETCH_L	| OP_ADCA	| STORE_NOP)	 ; 8D		ADC A,r
+.dw (FETCH_MHL	| OP_ADCA	| STORE_NOP)	 ; 8E		ADC A,r
+.dw (FETCH_A    | OP_ADCA	| STORE_NOP)	 ; 8F		ADC A,r
+.dw (FETCH_B	| OP_SUBFA	| STORE_NOP)	 ; 90		SUB A,r
+.dw (FETCH_C	| OP_SUBFA	| STORE_NOP)	 ; 91		SUB A,r
+.dw (FETCH_D	| OP_SUBFA	| STORE_NOP)	 ; 92		SUB A,r
+.dw (FETCH_E	| OP_SUBFA	| STORE_NOP)	 ; 93		SUB A,r
+.dw (FETCH_H	| OP_SUBFA	| STORE_NOP)	 ; 94		SUB A,r
+.dw (FETCH_L	| OP_SUBFA	| STORE_NOP)	 ; 95		SUB A,r
+.dw (FETCH_MHL	| OP_SUBFA	| STORE_NOP)	 ; 96		SUB A,r
+.dw (FETCH_A    | OP_SUBFA	| STORE_NOP)	 ; 97		SUB A,r
+.dw (FETCH_B	| OP_SBCFA	| STORE_NOP)	 ; 98		SBC A,r
+.dw (FETCH_C	| OP_SBCFA	| STORE_NOP)	 ; 99		SBC A,r
+.dw (FETCH_D	| OP_SBCFA	| STORE_NOP)	 ; 9A		SBC A,r
+.dw (FETCH_E	| OP_SBCFA	| STORE_NOP)	 ; 9B		SBC A,r
+.dw (FETCH_H	| OP_SBCFA	| STORE_NOP)	 ; 9C		SBC A,r
+.dw (FETCH_L	| OP_SBCFA	| STORE_NOP)	 ; 9D		SBC A,r
+.dw (FETCH_MHL	| OP_SBCFA	| STORE_NOP)	 ; 9E		SBC A,r
+.dw (FETCH_A    | OP_SBCFA	| STORE_NOP)	 ; 9F		SBC A,r
+.dw (FETCH_B	| OP_ANDA	| STORE_NOP)	 ; A0		AND A,r
+.dw (FETCH_C	| OP_ANDA	| STORE_NOP)	 ; A1		AND A,r
+.dw (FETCH_D	| OP_ANDA	| STORE_NOP)	 ; A2		AND A,r
+.dw (FETCH_E	| OP_ANDA	| STORE_NOP)	 ; A3		AND A,r
+.dw (FETCH_H	| OP_ANDA	| STORE_NOP)	 ; A4		AND A,r
+.dw (FETCH_L	| OP_ANDA	| STORE_NOP)	 ; A5		AND A,r
+.dw (FETCH_MHL	| OP_ANDA	| STORE_NOP)	 ; A6		AND A,r
+.dw (FETCH_A    | OP_ANDA	| STORE_NOP)	 ; A7		AND A,r
+.dw (FETCH_B	| OP_XORA	| STORE_NOP)	 ; A8		XOR A,r
+.dw (FETCH_C	| OP_XORA	| STORE_NOP)	 ; A9		XOR A,r
+.dw (FETCH_D	| OP_XORA	| STORE_NOP)	 ; AA		XOR A,r
+.dw (FETCH_E	| OP_XORA	| STORE_NOP)	 ; AB		XOR A,r
+.dw (FETCH_H	| OP_XORA	| STORE_NOP)	 ; AC		XOR A,r
+.dw (FETCH_L	| OP_XORA	| STORE_NOP)	 ; AD		XOR A,r
+.dw (FETCH_MHL	| OP_XORA	| STORE_NOP)	 ; AE		XOR A,r
+.dw (FETCH_A    | OP_XORA	| STORE_NOP)	 ; AF		XOR A,r
+.dw (FETCH_B	| OP_ORA	| STORE_NOP)	 ; B0		OR A,r
+.dw (FETCH_C	| OP_ORA	| STORE_NOP)	 ; B1		OR A,r
+.dw (FETCH_D	| OP_ORA	| STORE_NOP)	 ; B2		OR A,r
+.dw (FETCH_E	| OP_ORA	| STORE_NOP)	 ; B3		OR A,r
+.dw (FETCH_H	| OP_ORA	| STORE_NOP)	 ; B4		OR A,r
+.dw (FETCH_L	| OP_ORA	| STORE_NOP)	 ; B5		OR A,r
+.dw (FETCH_MHL	| OP_ORA	| STORE_NOP)	 ; B6		OR A,r
+.dw (FETCH_A    | OP_ORA	| STORE_NOP)	 ; B7		OR A,r
+.dw (FETCH_B	| OP_CPFA	| STORE_NOP)	 ; B8		CP A,r
+.dw (FETCH_C	| OP_CPFA	| STORE_NOP)	 ; B9		CP A,r
+.dw (FETCH_D	| OP_CPFA	| STORE_NOP)	 ; BA		CP A,r
+.dw (FETCH_E	| OP_CPFA	| STORE_NOP)	 ; BB		CP A,r
+.dw (FETCH_H	| OP_CPFA	| STORE_NOP)	 ; BC		CP A,r
+.dw (FETCH_L	| OP_CPFA	| STORE_NOP)	 ; BD		CP A,r
+.dw (FETCH_MHL	| OP_CPFA	| STORE_NOP)	 ; BE		CP A,r
+.dw (FETCH_A    | OP_CPFA	| STORE_NOP)	 ; BF	 	CP A,r
 .dw (FETCH_NOP  | OP_IFNZ	| STORE_RET)	 ; C0		RET NZ
 .dw (FETCH_NOP  | OP_POP16	| STORE_BC )	 ; C1		POP BC
 .dw (FETCH_DIR16| OP_IFNZ	| STORE_PC )	 ; C2 nn nn	JP NZ,nn
 .dw (FETCH_DIR16| OP_NOP	| STORE_PC )	 ; C3 nn nn	JP nn
 .dw (FETCH_DIR16| OP_IFNZ	| STORE_CALL)	 ; C4 nn nn	CALL NZ,nn
 .dw (FETCH_BC	| OP_PUSH16	| STORE_NOP)	 ; C5		PUSH BC
-.dw (FETCH_DIR8	| OP_ADDA	| STORE_A  )	 ; C6 nn	ADD A,n
+.dw (FETCH_DIR8	| OP_ADDA	| STORE_NOP)	 ; C6 nn	ADD A,n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; C7		RST 0
 .dw (FETCH_NOP	| OP_IFZ	| STORE_RET)	 ; C8		RET Z
 .dw (FETCH_NOP	| OP_NOP	| STORE_RET)	 ; C9		RET
@@ -3808,7 +4285,7 @@ inst_table:
 .dw (FETCH_NOP	| OP_INV	| STORE_NOP)	 ; CB 		(Z80 specific)
 .dw (FETCH_DIR16| OP_IFZ	| STORE_CALL)	 ; CC nn nn	CALL Z,nn
 .dw (FETCH_DIR16| OP_NOP	| STORE_CALL)	 ; CD nn nn	CALL nn
-.dw (FETCH_DIR8	| OP_ADCA	| STORE_A  )	 ; CE nn	ADC A,n
+.dw (FETCH_DIR8	| OP_ADCA	| STORE_NOP)	 ; CE nn	ADC A,n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; CF		RST 8H
 .dw (FETCH_NOP	| OP_IFNC	| STORE_RET)	 ; D0		RET NC
 .dw (FETCH_NOP  | OP_POP16	| STORE_DE )	 ; D1		POP DE
@@ -3816,7 +4293,7 @@ inst_table:
 .dw (FETCH_DIR8	| OP_OUTA	| STORE_NOP)	 ; D3 nn	OUT (n),A
 .dw (FETCH_DIR16| OP_IFNC	| STORE_CALL)	 ; D4 nn nn	CALL NC,nn
 .dw (FETCH_DE	| OP_PUSH16	| STORE_NOP)	 ; D5		PUSH DE
-.dw (FETCH_DIR8	| OP_SUBFA	| STORE_A  )	 ; D6 nn	SUB n
+.dw (FETCH_DIR8	| OP_SUBFA	| STORE_NOP)	 ; D6 nn	SUB n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; D7		RST 10H
 .dw (FETCH_NOP	| OP_IFC	| STORE_RET)	 ; D8		RET C
 .dw (FETCH_NOP	| OP_INV	| STORE_NOP)	 ; D9		EXX		(Z80)
@@ -3824,7 +4301,7 @@ inst_table:
 .dw (FETCH_DIR8	| OP_IN 	| STORE_A  )	 ; DB nn	IN A,(n)
 .dw (FETCH_DIR16| OP_IFC	| STORE_CALL)	 ; DC nn nn	CALL C,nn
 .dw (FETCH_NOP	| OP_INV	| STORE_NOP)	 ; DD 		(Z80)
-.dw (FETCH_DIR8	| OP_SBCFA	| STORE_A  )	 ; DE nn	SBC A,n
+.dw (FETCH_DIR8	| OP_SBCFA	| STORE_NOP)	 ; DE nn	SBC A,n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; DF		RST 18H
 .dw (FETCH_NOP	| OP_IFPO	| STORE_RET)	 ; E0		RET PO
 .dw (FETCH_NOP	| OP_POP16	| STORE_HL )	 ; E1		POP HL
@@ -3832,7 +4309,7 @@ inst_table:
 .dw (FETCH_MSP	| OP_EXHL	| STORE_MSP)	 ; E3		EX (SP),HL
 .dw (FETCH_DIR16| OP_IFPO	| STORE_CALL)	 ; E4 nn nn	CALL PO,nn
 .dw (FETCH_HL	| OP_PUSH16	| STORE_NOP)	 ; E5		PUSH HL
-.dw (FETCH_DIR8	| OP_ANDA	| STORE_A  )	 ; E6 nn	AND n
+.dw (FETCH_DIR8	| OP_ANDA	| STORE_NOP)	 ; E6 nn	AND n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; E7		RST 20H
 .dw (FETCH_NOP	| OP_IFPE	| STORE_RET)	 ; E8		RET PE
 .dw (FETCH_HL	| OP_NOP	| STORE_PC )	 ; E9		JP (HL)
@@ -3840,7 +4317,7 @@ inst_table:
 .dw (FETCH_DE	| OP_EXHL	| STORE_DE )	 ; EB		EX DE,HL
 .dw (FETCH_DIR16| OP_IFPE	| STORE_CALL)	 ; EC nn nn	CALL PE,nn
 .dw (FETCH_NOP	| OP_INV	| STORE_NOP)	 ; ED		(Z80 specific)
-.dw (FETCH_DIR8	| OP_XORA	| STORE_A  )	 ; EE nn	XOR n
+.dw (FETCH_DIR8	| OP_XORA	| STORE_NOP)	 ; EE nn	XOR n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; EF		RST 28H
 .dw (FETCH_NOP	| OP_IFP	| STORE_RET)	 ; F0		RET P
 .dw (FETCH_NOP	| OP_POP16	| STORE_AF )	 ; F1		POP AF
@@ -3848,7 +4325,7 @@ inst_table:
 .dw (FETCH_NOP	| OP_DI		| STORE_NOP)	 ; F3		DI
 .dw (FETCH_DIR16| OP_IFP	| STORE_CALL)	 ; F4 nn nn	CALL P,nn
 .dw (FETCH_AF	| OP_PUSH16	| STORE_NOP)	 ; F5		PUSH AF
-.dw (FETCH_DIR8	| OP_ORA	| STORE_A  )	 ; F6 nn	OR n
+.dw (FETCH_DIR8	| OP_ORA	| STORE_NOP)	 ; F6 nn	OR n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; F7		RST 30H
 .dw (FETCH_NOP	| OP_IFM	| STORE_RET)	 ; F8		RET M
 .dw (FETCH_HL	| OP_NOP	| STORE_SP )	 ; F9		LD SP,HL
@@ -3856,8 +4333,7 @@ inst_table:
 .dw (FETCH_NOP	| OP_EI 	| STORE_NOP)	 ; FB		EI
 .dw (FETCH_DIR16| OP_IFM	| STORE_CALL)	 ; FC nn nn	CALL M,nn
 .dw (FETCH_NOP	| OP_INV	| STORE_NOP)	 ; FD 		(Z80 specific)
-.dw (FETCH_DIR8	| OP_SUBFA	| STORE_NOP)	 ; FE nn	CP n
+.dw (FETCH_DIR8	| OP_CPFA	| STORE_NOP)	 ; FE nn	CP n
 .dw (FETCH_RST	| OP_NOP	| STORE_CALL)	 ; FF		RST 38H
 
 ; vim:set ts=8 noet nowrap
-