my_getchar() parameter: allow return without new character

[z180-stamp.git] / z180 / r3init.180

	page	255\r
	.z80\r
\r
	extrn ddtz,bpent\r
	extrn $stack\r
	extrn $coninit,$cists,$ci\r
\r
	extrn romend\r
\r
\r
	global	isv_sw\r
\r
	include config.inc\r
	include	z180reg.inc\r
	include z180.lib\r
\r
;CR	equ	0dh\r
\r
\r
\r
;----------------------------------------------------------------------\r
\r
	cseg\r
\r
	jp start\r
\r
; restart vectors\r
\r
rsti	defl	1\r
	rept	7\r
	 db 0, 0, 0, 0, 0\r
	 jp bpent\r
rsti	 defl rsti+1\r
	endm\r
	 db 0, 0, 0, 0, 0\r
\r
;----------------------------------------------------------------------\r
	\r
	;org	40h\r
\r
	dw	0\r
	db	0\r
\r
\r
	if ROMSYS\r
$crom:	 defb c$rom		;\r
	else\r
	 db	0		;\r
	endif\r
\r
dmclrt:				;clear ram per dma\r
	db	dmct_e-dmclrt-2 ;\r
	db	sar0l		;first port\r
	dw	nullbyte	;src (fixed)\r
nullbyte:\r
	db 	000h		;src\r
	dw	romend		;dst (inc), start after "rom" code\r
	db	00h		;dst\r
	dw 	0-romend	;count (64k)\r
dmct_e:\r
\r
INIWAITS defl	CWAITIO\r
	if	ROMSYS\r
INIWAITS defl	INIWAITS+CWAITROM\r
	endif\r
\r
hwini0:\r
	db	3		;count\r
	db	rcr,CREFSH	;configure DRAM refresh\r
	db	dcntl,INIWAITS	;wait states\r
	db	cbar,SYS$CBAR\r
\r
;----------------------------------------------------------------------\r
\r
start:\r
	push af			;003c\r
	in0 a,(itc)		;003d	Illegal opcode trap?\r
	jp p,??st01		;0040\r
	pop af			;0043\r
	jp bpent		;0044	  yes, handle\r
\r
??st01:\r
	ld a,i			;0047	I register == 0 ?\r
	jr z,??st02		;004b     yes, harware reset\r
	pop af			;004d\r
	jp bpent		;004e	  no, allready set up\r
\r
??st02:\r
	di			;0058\r
	ld	a,CREFSH\r
	out0	(rcr),a		;	configure DRAM refresh\r
	ld	a,CWAITIO\r
	out0	(dcntl),a	;	wait states\r
\r
	ld	a,M_NCD		;No Clock Divide\r
	out0	(ccr),a\r
;	ld	a,M_X2CM	;X2 Clock Multiplier\r
;	out0	(cmr),a\r
\r
; search warm start mark\r
\r
	ld ix,mark_55AA		;00b8	; top of common area\r
	ld a,SYS$CBAR		;\r
	out0 (cbar),a		;\r
	ld a,071h		;00bc\r
	ex af,af'		;00be	;for cbr = 0x70 downto 0x40\r
swsm_l:\r
	ex af,af'		;00bf\r
	dec a			;00c0\r
	cp 03fh			;00c1\r
	jr z,kstart		;00c3	;  break (mark not found)\r
	out0 (cbr),a		;00c5\r
	ex af,af'		;00c8\r
	ld a,0aah		;00c9\r
	cp (ix+000h)		;00cb\r
	jr nz,swsm_l		;00ce\r
	cp (ix+002h)		;00d0\r
	jr nz,swsm_l		;00d3\r
	cpl			;00d5\r
	cp (ix+001h)		;00d6\r
	jr nz,swsm_l		;00d9\r
	cp (ix+003h)		;00db\r
	jr nz,swsm_l		;00de\r
	ld sp,$stack		;00e0	mark found, check\r
	call checkcrc_alv	;00e3\r
	jp z,wstart		;00e6	check ok,\r
\r
;\r
; ram not ok, initialize    --  kstart --\r
\r
kstart:\r
\r
	ld	a,088h		;00e9	0000-7fff: common 0\r
	out0	(cbar),a	;00eb   8000-ffff: common 1\r
	ld	ix,08000h	;00f3\r
	ld	a,0		;00f1	start at 008000 (2. phys. 32k block)\r
??f_0:\r
	out0	(cbr),a		;00f9\r
\r
	ld	(ix+0),a	;0103\r
	cpl\r
	ld	(ix+1),a	;0103\r
	cpl\r
	add	a,8		;010a	next 'bank'\r
	cp	078h		;010c	stop at 078000\r
	jr	nz,??f_0	;010e\r
\r
	ld	de,8000h	;0114   first block not tested, but mark as ok\r
	ld	a,0		;00f1	start at 008000 (2. phys. 32k block)\r
??cp_0:\r
	out0	(cbr),a		;011c\r
	ld	c,a\r
	xor	(ix+0)\r
	ld	b,a\r
	ld	a,c\r
	cpl\r
	xor	(ix+1)\r
	or	b\r
	jr	nz,??cp_1\r
	scf\r
??cp_1:\r
	rr	d\r
	rr	e\r
	ld	a,c\r
	add	a,8\r
	cp	078h		;	stop at 078000\r
	jr	nz,??cp_0\r
\r
;\r
;  ram test found 1 or more error free blocks (32k)\r
;\r
\r
ramok:\r
	ld	a,SYS$CBAR	;01c8\r
	out0	(cbar),a	;01ca\r
	ld	h,d\r
	ld	l,e\r
	ld 	c,070h		;01ce	highest block\r
	ld 	b,15		;01d0\r
??sr_1:\r
	add	hl,hl\r
	jr	c,alloc		;01d4	highest "error free" block\r
	ld	a,c		;01d6\r
	sub	008h		;01d7\r
	ld	c,a		;01d9\r
	djnz	??sr_1		;01da\r
\r
	slp			;01dc	should never be reached\r
\r
alloc:\r
	out0	(cbr),c		;01de\r
	ld	sp,$stack	;01e1\r
\r
; Clear RAM using DMA0\r
\r
	ld	hl,dmclrt	;load DMA registers\r
	call	io.ini.m\r
	ld	a,0cbh		;01ef	dst +1, src fixed, burst\r
	out0	(dmode),a	;01f1\r
\r
	ld	b,512/64\r
	ld	a,062h		;01f4	enable dma0,\r
??cl_1:\r
	out0	(dstat),a	;01f9	clear (up to) 64k\r
	djnz	??cl_1		;	end of RAM?\r
\r
; Init bank manager\r
\r
	ld	hl,banktabsys	;020f\r
	ld	(hl),c		;	Common area\r
	inc	hl		;0213\r
	ld	(hl),c		;	System work area\r
	inc	hl		;0215	Point to bank 0 entry\r
	ld	b,BANKS		;0216\r
l0218h:\r
	ld	(hl),0ffh	;0218	Mark all banks as unassigned\r
	inc	hl		;021a\r
	djnz	l0218h		;021b\r
\r
	ld	hl,memalv	;\r
	ld	b,8		;	8*4k ie. first 32k\r
??a_0:\r
	ld	(hl),0e0h	;	mark as sys ("rom"/monitor)\r
	inc	hl\r
	djnz	??a_0\r
\r
	rr	d		;	shift out bit for block 0\r
	rr	e		;\r
	ld	c,15		;022c	15*32k remaining blocks\r
l022eh:\r
	ld	a,0feh		;	0xfe == block with error(s)\r
	rr	d		;\r
	rr	e\r
	adc	a,0		;	==> 0xff : block ok\r
	ld	b,32/4		;	32k == 8 * 4k\r
l0236h:\r
	ld	(hl),a		;\r
	inc	hl		;\r
	djnz	l0236h		;\r
	dec	c		;\r
	jr	nz,l022eh	;next 32k block\r
\r
	ld	hl,memalv+0ch	;memalv+0ch\r
	ld	a,(banktabsys)	;\r
	call	add_hl_a\r
	ld	b,3		;\r
l024ah:\r
	ld	(hl),0ech	;alloc system ram\r
	inc	hl		;\r
	djnz	l024ah		;\r
	ld	(hl),0efh	;alloc common\r
	call	gencrc_alv\r
\r
	ld	hl,0000h	;bank #\r
	ld	bc,0f0fh	;  size (?) (4k blocks)\r
	xor	a		;\r
	call	sub_0420h	;alloc mem for bank 0\r
	ld	c,l		;\r
	or	a		;\r
	call	z,sub_04b5h	;\r
\r
	ld	hl,0101h	;\r
	ld	bc,0f0fh	;\r
	xor	a		;\r
	call	sub_0420h	;\r
	ld	c,l		;\r
	or	a		;\r
	call	z,sub_04b5h	;\r
\r
	ld	hl,055AAh	;set warm start mark\r
	ld	(mark_55AA),hl	;\r
	ld	(mark_55AA+2),hl;\r
\r
;\r
; crc ok       --  wstart  --\r
;\r
wstart:\r
	call	sysram_init	;027f\r
	call	ivtab_init\r
\r
	call	prt0_init\r
\r
	call	$coninit\r
\r
	call	bufferinit\r
\r
\r
\r
	im 2			;?030e\r
	ei			;0282\r
\r
	call $cists		;0284\r
	call $cists		;0287\r
	or a			;028a\r
	call nz,$ci		;028d\r
\r
	ld a,(banktab)		;\r
	ld e,a			;\r
	jp ddtz			;0290\r
\r
;\r
;----------------------------------------------------------------------\r
;\r
\r
;TODO: Make a ringbuffer module.\r
\r
	global	buf.init\r
\r
buf.init:\r
	ld	(ix+o.in_idx),0\r
	ld	(ix+o.out_idx),0\r
	ld	(ix+o.mask),a\r
	ret\r
\r
;----------------------------------------------------------------------\r
\r
	extrn	msginit,msg_tx_fifo,msg_rx_fifo\r
	extrn	msg.sout\r
\r
bufferinit:\r
\r
	ld	de,msg_tx_fifo\r
	in0	a,cbr\r
	call	log2phys\r
	ld	(40h+0),hl\r
	ld	(40h+2),a\r
\r
	ld	(bufdat+1),hl\r
	ld	(bufdat+3),a\r
	xor	a\r
	ld	(bufdat+0),a\r
	ld	hl,inimsg\r
	call	msg.sout\r
\r
	ld	de,msg_rx_fifo\r
	in0	a,cbr\r
	call	log2phys\r
	ld	(bufdat+1),hl\r
	ld	(bufdat+3),a\r
	ld	a,1\r
	ld	(bufdat+0),a\r
	ld	hl,inimsg\r
	call	msg.sout\r
\r
	ret\r
\r
inimsg:\r
	db	inimsg_e - $ - 1\r
	db	81h\r
	db	inimsg_e - $ - 1\r
	db	0\r
bufdat:\r
	db	0\r
	dw	0\r
	db	0\r
inimsg_e:\r
\r
;----------------------------------------------------------------------\r
;\r
if 0\r
\r
	extrn	msginit,msg.sout,msg_fifo\r
	extrn	tx.buf,rx.buf\r
\r
\r
bufferinit:\r
	call	 msginit\r
\r
	ld	hl,buffers\r
	ld	bc,0300h	; b:count, c:buffer nr\r
bfi_1:\r
	ld	e,(hl)\r
	inc	hl\r
	ld	d,(hl)\r
	inc	hl\r
	push	hl\r
	in0	a,cbr\r
	call	log2phys\r
	ld	(bufdat+1),hl\r
	ld	(bufdat+3),a\r
	ld	a,c\r
	ld	(bufdat+0),a\r
	ld	hl,inimsg\r
	call	msg.sout\r
	pop	hl\r
	inc	c\r
	djnz	bfi_1\r
	ret\r
\r
	rept	20\r
	db	0\r
	endm\r
\r
buffers:\r
	dw	msg_fifo\r
	dw	tx.buf\r
	dw	rx.buf\r
\r
inimsg:\r
	db	inimsg_e - $ -2\r
	db	PMSG\r
	db	81h\r
	db	inimsg_e - $ -1\r
	db	0\r
bufdat:\r
	db	0\r
	dw	0\r
	db	0\r
inimsg_e:\r
\r
endif\r
\r
;\r
;----------------------------------------------------------------------\r
;\r
\r
sysram_init:\r
	ld hl,sysramw\r
	ld de,topcodsys\r
	ld bc,sysrame-sysramw\r
	ldir\r
\r
	ret\r
\r
;----------------------------------------------------------------------\r
\r
ivtab_init:\r
	ld	hl,ivtab	;\r
	ld	a,h		;\r
	ld	i,a		;\r
	out0	(il),l		;\r
\r
; Let all vectors point to spurious int routines.\r
\r
	ld	d,high sp.int0\r
	ld	a,low  sp.int0\r
	ld	b,9\r
ivt_i1:\r
	ld	(hl),a\r
	inc	l\r
	ld	(hl),d\r
	inc	l\r
	add	a,sp.int.len\r
	djnz	ivt_i1\r
	ret\r
\r
;----------------------------------------------------------------------\r
\r
prt0_init:\r
	ld	a,i\r
	ld	h,a\r
	in0	a,(il)\r
	and	0E0h\r
	or	IV$PRT0\r
	ld	l,a\r
	ld	(hl),low  iprt0\r
	inc	hl\r
	ld	(hl),high iprt0\r
	ld	hl,prt0itab\r
	call	io.ini.m\r
	ret\r
\r
prt0itab:\r
	db	prt0it_e-prt0itab-2\r
	db	tmdr0l\r
	dw	PRT_TC10MS\r
	dw	PRT_TC10MS\r
	db	M_TIE0+M_TDE0	;enable timer 0 interrupt and down count.\r
prt0it_e:\r
\r
\r
;\r
;----------------------------------------------------------------------\r
;\r
\r
io.ini:\r
	push	bc\r
	ld	b,0		;high byte port adress\r
	ld	a,(hl)		;count\r
	inc	hl\r
ioi_1:\r
	ld	c,(hl)		;port address\r
	inc	hl\r
	outi\r
	inc	b		;outi decrements b\r
	dec	a\r
	jr	nz,ioi_1\r
	pop	bc\r
	ret\r
\r
io.ini.m:\r
	push	bc\r
	ld	b,(hl)\r
	inc	hl\r
	ld	c,(hl)\r
	inc	hl\r
	otimr\r
	pop	bc\r
	ret\r
\r
io.ini.l:\r
;\r
\r
;----------------------------------------------------------------------\r
;\r
\r
; compute crc\r
; hl: start adr\r
; bc: len\r
; bc returns crc val\r
\r
do_crc16:\r
	ld	de,0FFFFh\r
crc1:\r
	ld	a,(hl)\r
	xor	e\r
	ld	e,a\r
	rrca\r
	rrca\r
	rrca\r
	rrca\r
	and	0Fh\r
	xor	e\r
	ld	e,a\r
	rrca\r
	rrca\r
	rrca\r
	push	af\r
	and	1Fh\r
	xor	d\r
	ld	d,a\r
	pop	af\r
	push	af\r
	rrca\r
	and	0F0h\r
	xor	d\r
	ld	d,a\r
	pop	af\r
	and	0E0h\r
	xor	e\r
	ld	e,d\r
	ld	d,a\r
	cpi\r
	jp	pe,crc1\r
	or	e		;z-flag\r
	ret\r
\r
\r
gencrc_alv:\r
	push hl			;03f6\r
	push de			;03f7\r
	push bc\r
	push af			;03f8\r
	ld hl,banktabsys	;03f9\r
	ld bc,crc_len		;03fc\r
	call do_crc16		;03ff\r
	ld (hl),e\r
	inc hl\r
	ld (hl),d\r
	pop af			;0406\r
	pop bc\r
	pop de			;0407\r
	pop hl			;0408\r
	ret			;0409\r
\r
checkcrc_alv:\r
	push hl			;040a\r
	push de\r
	push bc			;040b\r
	ld hl,banktabsys	;040d\r
	ld bc,crc_len+2		;0410\r
	call do_crc16		;0413\r
	pop bc			;041d\r
	pop de\r
	pop hl			;041e\r
	ret			;041f\r
\r
;----------------------------------------------------------------------\r
\r
;\r
;  alloc\r
;\r
;	h:	max bank #\r
;	l:	min bank #\r
;	b:	max size\r
;	c:	min size\r
;\r
;    ret:\r
;	a: 	0  == ok\r
;		1  ==\r
;		2  == no bank # in requested range\r
;		ff == crc error\r
;\r
\r
sub_0420h:\r
	call checkcrc_alv	;0420\r
	jr nz,l049ch		;0424	crc error, tables corrupt\r
\r
	call sub_049dh		;0427	bank # in req. range available?\r
	jr c,l0499h		;042a\r
	push ix			;042c\r
	push iy			;042e\r
	push de			;0430\r
	push hl			;0431\r
	push bc			;0432\r
	ld c,b			;0433\r
	ld b,alv_len+1		;0434\r
	ld d,0			;0436\r
	ld hl,memalv-1		;0438\r
	jr l0441h		;043b\r
\r
; find free blocks\r
\r
l043dh:\r
	ld a,(hl)		;043d\r
	inc a			;043e	free blocks are marked 0ffh\r
	jr z,l0446h		;043f\r
l0441h:\r
	inc hl			;0441\r
	djnz l043dh		;0442\r
	jr l0464h		;0444\r
l0446h:\r
	push hl			;0446\r
	pop ix			;0447	free blocks start here\r
	ld e,000h		;0449\r
	jr l0451h		;044b\r
l044dh:				;	count free blocks\r
	ld a,(hl)		;044d\r
	inc a			;044e\r
	jr nz,l0457h		;044f\r
l0451h:\r
	inc e			;0451\r
	inc hl			;0452\r
	djnz l044dh		;0453\r
	jr l0464h		;0455\r
\r
; end of free blocks run.\r
\r
l0457h:\r
	ld a,d			;0457\r
	cp e			;0458	nr of blocks >= requested ?\r
	jr nc,l0441h		;0459\r
\r
	ld d,e			;045b\r
	push ix			;045c\r
	pop iy			;045e\r
	ld a,d			;0460\r
	cp c			;0461\r
	jr c,l0441h		;0462\r
l0464h:\r
	pop bc			;0464\r
	ld a,d			;0465\r
	cp b			;0466\r
	jr c,l046ch		;0467\r
	ld d,b			;0469\r
	jr l0471h		;046a\r
l046ch:\r
	cp c			;046c\r
	jr nc,l0471h		;046d\r
	ld d,000h		;046f\r
l0471h:\r
	ld a,d			;0471\r
	push iy			;0472\r
	pop hl			;0474\r
	ld de,memalv		;0475\r
	or a			;0478\r
	sbc hl,de		;0479\r
	ld b,l			;047b\r
	ld c,a			;047c\r
	pop hl			;047d\r
l047eh:\r
	or a			;047e\r
	jr z,l0489h		;047f\r
	ld (iy+0),l		;0481\r
	inc iy			;0484\r
	dec a			;0486\r
	jr l047eh		;0487\r
l0489h:\r
	pop de			;0489\r
	pop iy			;048a\r
	pop ix			;048c\r
	call gencrc_alv		;048e\r
	ld a,c			;0491\r
	or a			;0492\r
	ld a,000h		;0493\r
	ret nz			;0495\r
	or 001h			;0496\r
	ret			;0498\r
\r
l0499h:\r
	ld a,2			;0499\r
l049ch:\r
	or a\r
	ret			;049c\r
\r
\r
; search a free bank number in range\r
;	h: max #\r
;	l: min #\r
;    ret:\r
;	l: bank number available\r
;	nc, if found, bank nr. in l\r
;	cy, if none found\r
\r
sub_049dh:\r
	push de			;049d\r
	push bc			;049e\r
	ex de,hl		;049f\r
	dec e			;04a0\r
l04a1h:\r
	inc e			;04a1	test next #\r
	ld a,d			;04a2\r
	cp e			;04a3\r
	jr c,l04b1h		;04a4\r
	ld a,e			;04a6\r
	ld hl,memalv		;04a7\r
	ld bc,alv_len		;04aa\r
	cpir			;04ad	bank# allready allocated?\r
	jr z,l04a1h		;04af	if yes, search for next\r
l04b1h:\r
	ex de,hl		;04b1\r
	pop bc			;04b2\r
	pop de			;04b3\r
	ret			;04b4\r
\r
\r
sub_04b5h:\r
	ld a,l			;04b5\r
	cp 012h			;04b6\r
	ccf			;04b8\r
	ret c			;04b9\r
	push hl			;04ba\r
	ld hl,banktab		;04bb\r
	call add_hl_a\r
	ld (hl),b		;04c3\r
	call gencrc_alv		;04c4\r
	pop hl			;04c7\r
	or a			;04c8	clear carry\r
	ret			;04c9\r
\r
\r
;--------------------------------------------------------------\r
;\r
; de: Log. Address\r
;  a: Bank number\r
;\r
;out ahl: Phys. (linear) Address\r
\r
\r
bnk2phys:\r
	push	hl\r
	ld	hl,banktab\r
	call	add_hl_a\r
	ld	a,(hl)\r
	pop	hl\r
\r
	; fall thru\r
;--------------------------------------------------------------\r
;\r
; de: Log. Address\r
;  a: Bank (bbr)\r
;\r
; OP: ahl = (a<<12) + (d<<8) + e\r
;\r
;out ahl: Phys. (linear) Address\r
\r
\r
log2phys:\r
	push	bc		;\r
	ld	c,a		;\r
	ld	b,16		;\r
	mlt	bc		;bc = a<<4\r
	ld	l,d		;\r
	ld	h,0		;\r
	add	hl,bc		;bc + d == a<<4 + d\r
	ld	a,h		;\r
	ld	h,l		;\r
	ld	l,e		;\r
	pop	bc		;\r
	ret			;\r
\r
\r
;--------------------------------------------------------------\r
;\r
;return:\r
; hl = hl + a\r
; Flags undefined\r
;\r
\r
add_hl_a:\r
	add a,l\r
	ld l,a\r
	ret nc\r
	inc h\r
	ret\r
\r
; ---------------------------------------------------------\r
\r
sysramw:\r
\r
	.phase isvsw_loc\r
topcodsys:\r
\r
; Trampoline for interrupt routines in banked ram.\r
; Switch stack pointer to "system" stack in top ram\r
; Save cbar\r
\r
isv_sw:				;\r
	ex (sp),hl		;	save hl, return adr in hl\r
	push de			;\r
	push af			;\r
	ex de,hl		;\r
	ld hl,0			;\r
	add hl,sp		;\r
	ld a,h			;\r
	cp 0f8h			;\r
	jr nc,isw_1		;\r
	ld sp,$stack		;\r
isw_1:\r
	push hl			;\r
	in0 h,(cbar)		;\r
	push hl			;\r
	ld a,SYS$CBAR		;\r
	out0 (cbar),a		;\r
	ex de,hl		;\r
	ld e,(hl)		;\r
	inc hl			;\r
	ld d,(hl)		;\r
	ex de,hl		;\r
	push bc			;\r
	call jphl		;\r
\r
	pop bc			;\r
	pop hl			;\r
	out0 (cbar),h		;\r
	pop hl			;\r
	ld sp,hl		;\r
	pop af			;\r
	pop de			;\r
	pop hl			;\r
	ei			;\r
	ret			;\r
jphl:\r
	jp (hl)			;\r
\r
; ---------------------------------------------------------\r
\r
\r
iprt0:\r
	push	af\r
	push	hl\r
	in0	a,(tcr)\r
	in0	a,(tmdr0l)\r
	in0	a,(tmdr0h)\r
	ld	a,(tim_ms)\r
	inc	a\r
	cp	100\r
	jr	nz,iprt_1\r
	xor	a\r
	ld	hl,(tim_s)\r
	inc	hl\r
	ld	(tim_s),hl\r
iprt_1:\r
	ld	(tim_ms),a\r
	pop	hl\r
	pop	af\r
	ei\r
	ret\r
\r
; ---------------------------------------------------------\r
\r
sp.int0:\r
	ld	a,0d0h\r
	jr	sp.i.1\r
sp.int.len equ	$-sp.int0\r
	ld	a,0d1h\r
	jr	sp.i.1\r
	ld	a,0d2h\r
	jr	sp.i.1\r
	ld	a,0d3h\r
	jr	sp.i.1\r
	ld	a,0d4h\r
	jr	sp.i.1\r
	ld	a,0d5h\r
	jr	sp.i.1\r
	ld	a,0d6h\r
	jr	sp.i.1\r
	ld	a,0d7h\r
	jr	sp.i.1\r
	ld	a,0d8h\r
sp.i.1:\r
;	out	(80h),a\r
	halt\r
\r
curph	defl	$\r
	.dephase\r
sysrame:\r
	.phase curph\r
tim_ms:	db	0\r
tim_s:	dw	0\r
	.dephase\r
\r
;-----------------------------------------------------\r
\r
	dseg\r
\r
	ds	1\r
banktabsys:\r
	ds	1	;0c001h\r
	ds	1	;0c002h\r
banktab:\r
	ds	BANKS	;0c003h\r
memalv:\r
	ds	512/4		;Number of 4k blocks\r
alv_len	equ	$-memalv\r
crc_len	equ	$-banktabsys\r
\r
crc_memalv:\r
	ds	2	;\r
\r
	cseg\r
\r
	;.phase	0ffc0h\r
;ivtab	equ	0ffc0h		; 0ffc0h	;int vector table\r
	;.dephase\r
\r
	;.phase	0fffch\r
mark_55AA equ 0fffch\r
	;ds	4		; 0fffch\r
	;.dephase\r
\r
\r
	end\r
\r