z_h: .byte 1
z_l: .byte 1
-
.cseg
;Init z80
printstring "Ok, CPU is live!"
printnewline
-
main:
.if INS_DEBUG
cbi flags,trace
notraceon:
.endif
-
.if PRINT_PC
cpi z_pch,DBG_TRACE_BOTTOM
brlo noprintpc
do_fetch_mbc:
lds xh,z_b
lds xl,z_c
- mem_read_d opl
+ mem_read_d z_a
fetch_end
do_fetch_mde:
lds xh,z_d
lds xl,z_e
- mem_read_d opl
+ mem_read_d z_a
fetch_end
do_fetch_mhl:
do_store_mbc:
lds xh,z_b
lds xl,z_c
- mem_write_s opl
+ mem_write_s z_a
store_end
do_store_mde:
lds xh,z_d
lds xl,z_e
- mem_write_s opl
+ mem_write_s z_a
store_end
do_store_mhl:
gen_opjmp op_dec
gen_opjmp op_inc16
gen_opjmp op_dec16
- gen_opjmp op_rlc
- gen_opjmp op_rrc
- gen_opjmp op_rr
- gen_opjmp op_rl
+ gen_opjmp op_rlca
+ gen_opjmp op_rrca
+ gen_opjmp op_rra
+ gen_opjmp op_rla
gen_opjmp op_adda
gen_opjmp op_adca
gen_opjmp op_subfa
.equ ZFL_N = 1
.equ ZFL_C = 0
-
.equ AVR_T = SREG_T
.equ AVR_H = SREG_H
.equ AVR_S = SREG_S
lpm @0,z
.endm
-.macro do_z80_flags_HP
+.macro do_z80_flags_V
#if EM_Z80
bmov z_flags, ZFL_P, temp, AVR_V
- bmov z_flags, ZFL_H, temp, AVR_H
#endif
.endm
#endif
.endm
+.macro do_z80_flags_clear_HN
+#if EM_Z80
+ andi z_flags,~((1<<ZFL_H)|(1<<ZFL_N))
+#endif
+.endm
+
+
+.macro do_z80_flags_copy_HC
+#if EM_Z80
+ bmov z_flags, ZFL_H, z_flags, ZFL_H
+#endif
+.endm
+
.macro do_z80_flags_op_rotate
; must not change avr carry flag!
#if EM_Z80
.macro do_z80_flags_op_and
#if EM_Z80
ori z_flags,(1<<ZFL_H)
-#else
- ori z_flags,(1<<ZFL_H)
#endif
.endm
.macro do_z80_flags_op_or
#if EM_Z80
+ ;nothing to do
#endif
.endm
;----------------------------------------------------------------
do_op_inv:
- printstring "Invalid opcode @ PC="
- movw temp,z_pcl
- lcall printhexw
+ sbiw z_pcl,1
+ lcall printregs
+ printstring "Invalid opcode! "
haltinv:
rjmp haltinv
.endif
mov temp,z_a
mov temp2,opl
- rcall portWrite
- op_end
+ lcall portWrite
+ ret
;----------------------------------------------------------------
;|Mnemonic |SZHPNC|Description |Notes |
.endif
mov temp2,opl
- rcall portRead
+ lcall portRead
mov opl,temp
.if PORT_DEBUG
;
;
do_op_inc:
- inc opl
-#if EM_Z80
+ ldi temp,1
+ add opl,temp
in temp, sreg
-#endif
- andi z_flags,(1<<ZFL_H)|(1<<ZFL_C) ; preserve C-, and H-flag
+ andi z_flags,(1<<ZFL_C) ; preserve C-flag
ldpmx temp2, sz53p_tab, opl
or z_flags,temp2 ;
- do_z80_flags_HP
- op_end
+ bmov z_flags, ZFL_H, temp, AVR_H
+ do_z80_flags_V
+op_end
do_op_inca:
- inc z_a
-#if EM_Z80
+ ldi temp,1
+ add z_a,temp
in temp, sreg
-#endif
- andi z_flags,(1<<ZFL_H)|(1<<ZFL_C) ; preserve C-, and H-flag
+ andi z_flags,(1<<ZFL_C) ; preserve C-flag
ldpmx temp2, sz53p_tab, z_a
or z_flags,temp2 ;
- do_z80_flags_HP
+ bmov z_flags, ZFL_H, temp, AVR_H
+ do_z80_flags_V
op_end
;----------------------------------------------------------------
;
;
do_op_dec:
- dec opl
-#if EM_Z80
+ subi opl,1
in temp, sreg
-#endif
- andi z_flags,(1<<ZFL_H)|(1<<ZFL_C) ; preserve C-, and H-flag
+ andi z_flags,(1<<ZFL_C) ; preserve C-flag
ldpmx temp2, sz53p_tab, opl
or z_flags,temp2 ;
- do_z80_flags_HP
+ bmov z_flags, ZFL_H, temp, AVR_H
+ do_z80_flags_V
do_z80_flags_set_N
op_end
do_op_deca:
- dec z_a
-#if EM_Z80
+ ldi opl,1
+ sub z_a,opl
in temp, sreg
-#endif
- andi z_flags,(1<<ZFL_H)|(1<<ZFL_C) ; preserve C-, and H-flag
+ andi z_flags,(1<<ZFL_C) ; preserve C-flag
ldpmx temp2, sz53p_tab, z_a
or z_flags,temp2 ;
- do_z80_flags_HP
+ bmov z_flags, ZFL_H, temp, AVR_H
+ do_z80_flags_V
do_z80_flags_set_N
op_end
;|RLCA |---- *|Rotate Left Circular |A=A<- |
;
;
-do_op_rlc:
+do_op_rlca:
;Rotate Left Cyclical. All bits move 1 to the
;left, the msb becomes c and lsb.
do_z80_flags_op_rotate
- lsl opl
+ lsl z_a
brcc do_op_rlc_noc
- ori opl, 1
+ ldi temp,1
+ or z_a,temp
ori z_flags, (1<<ZFL_C)
do_op_rlc_noc:
op_end
;|RRCA |---- *|Rotate Right Circular|A=->A |
;
;
-do_op_rrc:
+do_op_rrca:
;Rotate Right Cyclical. All bits move 1 to the
;right, the lsb becomes c and msb.
do_z80_flags_op_rotate
- lsr opl
+ lsr z_a
brcc do_op_rrc_noc
- ori opl, 0x80
+ ldi temp,0x80
+ or z_a,temp
ori z_flags, (1<<ZFL_C)
do_op_rrc_noc:
op_end
;|RRA |---- *|Rotate Right Acc. |A=->{CY,A} |
;
;
-do_op_rr:
+do_op_rra:
;Rotate Right. All bits move 1 to the right, the lsb
;becomes c, c becomes msb.
clc ; get z80 carry to avr carry
sbrc z_flags,ZFL_C
sec
do_z80_flags_op_rotate ; (clear ZFL_C, doesn't change AVR_C)
- bmov z_flags,ZFL_C, opl,0 ; Bit 0 --> CY
- ror opl
+ bmov z_flags,ZFL_C, z_a,0 ; Bit 0 --> CY
+ ror z_a
op_end
;----------------------------------------------------------------
;|RLA |---- *|Rotate Left Acc. |A={CY,A}<- |
;
;
-do_op_rl:
+do_op_rla:
;Rotate Left. All bits move 1 to the left, the msb
;becomes c, c becomes lsb.
clc
sbrc z_flags,ZFL_C
sec
do_z80_flags_op_rotate ; (clear ZFL_C, doesn't change AVR_C)
- bmov z_flags,ZFL_C, opl,7 ; Bit 7 --> CY
- rol opl
+ bmov z_flags,ZFL_C, z_a,7 ; Bit 7 --> CY
+ rol z_a
op_end
;----------------------------------------------------------------
in temp,sreg
ldpmx z_flags,sz53p_tab,z_a ;S,Z,P flag
bmov z_flags,ZFL_C, temp,AVR_C
- do_z80_flags_HP
+ bmov z_flags,ZFL_H, temp,AVR_H
+ do_z80_flags_V
op_end
;----------------------------------------------------------------
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
+ bmov z_flags,ZFL_H, temp,AVR_H
+ do_z80_flags_V
op_end
;----------------------------------------------------------------
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
+ bmov z_flags,ZFL_H, temp,AVR_H
+ do_z80_flags_V
do_z80_flags_set_N
op_end
;
do_op_cpfa:
- mov temp,z_a
- sub temp,opl
- mov opl,temp
+ mov temp2,z_a
+ sub temp2,opl
in temp,sreg
- ldpmx z_flags,sz53p_tab,opl ;S,Z,P
+ ldpmx z_flags,sz53p_tab,temp2 ;S,Z,P
bmov z_flags,ZFL_C, temp,AVR_C
- do_z80_flags_HP
+ bmov z_flags,ZFL_H, temp,AVR_H
+ do_z80_flags_V
do_z80_flags_set_N
op_end
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
+ bmov z_flags,ZFL_H, temp,AVR_H
+ do_z80_flags_V
do_z80_flags_set_N
op_end
;|----------|SZHP C|---------- 8080 ----------------------------|
;|AND s |**-P 0|Logical AND |A=A&s |
;
-; TODO H-Flag
+;
do_op_anda:
and z_a,opl ;
ldpmx z_flags,sz53p_tab,z_a ;S,Z,P,N,C
;|----------|SZHP C|---------- 8080 ----------------------------|
;|OR s |**-P00|Logical inclusive OR |A=Avs |
;
-; TODO: H-Flag
+;
do_op_ora:
or z_a,opl
ldpmx z_flags,sz53p_tab,z_a ;S,Z,H,P,N,C
;|----------|SZHP C|---------- 8080 ----------------------------|
;|XOR s |**-P 0|Logical Exclusive OR |A=Axs |
;
-; TODO: H-Flag
+;
do_op_xora:
eor z_a,opl
ldpmx z_flags,sz53p_tab,z_a ;S,Z,H,P,N,C
; and subtraction operations. For addition (ADD, ADC, INC) or subtraction
; (SUB, SBC, DEC, NEC), the following table indicates the operation performed:
;
-; -------------------------------------------------------------------------------
-; | | C Flag | HEX value in | H Flag | HEX value in | Number | C flag|
-; | Operation| Before | upper digit | Before | lower digit | added | After |
-; | | DAA | (bit 7-4) | DAA | (bit 3-0) | to byte | DAA |
-; |-----------------------------------------------------------------------------|
+; -------------------------------------------------------------------
+; | |C Flag |HEX value in|H Flag |HEX val in | Number |C flag |
+; | Oper |Before |upper digit |Before |lower digit| added |After |
+; | |DAA |(bit 7-4) |DAA |(bit 3-0) | to A |DAA |
+; |-------+-------+------------+-------+-----------+--------+-------|
; | | 0 | 0-9 | 0 | 0-9 | 00 | 0 |
; | ADD | 0 | 0-8 | 0 | A-F | 06 | 0 |
; | | 0 | 0-9 | 1 | 0-3 | 06 | 0 |
; | | 1 | 0-2 | 0 | 0-9 | 60 | 1 |
; | | 1 | 0-2 | 0 | A-F | 66 | 1 |
; | | 1 | 0-3 | 1 | 0-3 | 66 | 1 |
-; |-----------------------------------------------------------------------------|
+; |-------+-------+------------+-------+-----------+--------+-------|
; | SUB | 0 | 0-9 | 0 | 0-9 | 00 | 0 |
; | SBC | 0 | 0-8 | 1 | 6-F | FA | 0 |
; | DEC | 1 | 7-F | 0 | 0-9 | A0 | 1 |
; | NEG | 1 | 6-F | 1 | 6-F | 9A | 1 |
-; |-----------------------------------------------------------------------------|
-;
-; Flags:
-; C: See instruction.
+; -------------------------------------------------------------------
+;
+; The H flag is affected as follows:
+;
+; ---------------------
+; | N | H | low |H' |
+; | | |nibble | |
+; |---+---+-------+---|
+; | 0 | * | 0-9 | 0 |
+; | 0 | * | a-f | 1 |
+; | 1 | 0 | * | 0 |
+; | 1 | 1 | 6-f | 0 |
+; | 1 | 1 | 0-5 | 1 |
+; ---------------------
+;
+; Ohter flags:
; N: Unaffected.
; P/V: Set if Acc. is even parity after operation, reset otherwise.
-; H: See instruction.
; Z: Set if Acc. is Zero after operation, reset otherwise.
; S: Set if most significant bit of Acc. is 1 after operation, reset otherwise.
-
-
#if 1
+
do_op_da:
- ldi oph,0 ; what to add
- sbrc z_flags,ZFL_H ; if H-Flag
- rjmp op_da_06
- mov temp,opl
- andi temp,0x0f ; ... or lower digit > 9
- cpi temp,0x0a
- brlo op_da_06n
-op_da_06:
- ori oph,0x06
-op_da_06n:
- sbrc z_flags,(1<<ZFL_C)
- rjmp op_da_60
- cpi opl,0xa0
- brlo op_da_60n
-op_da_60:
- ori oph,0x60
-op_da_60n:
- cpi opl,0x9a
- brlo op_da_99n
- ori z_flags,(1<<ZFL_C); set C
-op_da_99n:
- sbrs z_flags,ZFL_N ; if sub-op
- rjmp op_da_add ; then
- sub opl,oph
- rjmp op_da_ex
-op_da_add: ; else add-op
- cpi opl,0x91
- brlo op_da_60n2
- mov temp,opl
- andi temp,0x0f
- cpi temp,0x0a
- brlo op_da_60n2
- ori oph,0x60
-op_da_60n2:
- add opl,oph
-op_da_ex:
- in temp,SREG
- sbrc temp,AVR_H
- ori z_flags,(1<<ZFL_C)
- andi z_flags,(1<<ZFL_N)|(1<<ZFL_C) ; preserve C,N
- ldpmx temp2, sz53p_tab, opl ; get S,Z,P
- or z_flags,temp2
- bmov z_flags,ZFL_H, temp,AVR_H ; H (?)
+
+#if EM_Z80
+ sbrc z_flags,ZFL_N ;if add-op
+ rjmp op_da_sub ;then
+#endif
+
+op_da_add:
+ ldi temp2,0 ; new C and H flag
+ sbrc z_flags,ZFL_H ; |
+ rjmp op_da_a01 ; if (H flag ...
+ mov temp,opl ; |
+ andi temp,0x0f ; |
+ cpi temp,0x0a ; or (lower nibble >= 0x0A))
+ brlo op_da_a10 ; |
+op_da_a01: ; then
+ ldi oph,0x06 ; add 6 to lower nibble
+ add opl,oph ;
+ brhc op_da_02 ; if
+ ori temp2,(1<<ZFL_H) ; set new H flag
+op_da_02: ;
+ brcc op_da_a10 ; if
+ ori temp2,(1<<ZFL_C) ; set new H flag
+op_da_a10: ; endif
+ sbrc z_flags,ZFL_C ; |
+ rjmp op_da_a12 ; if (C flag ...
+ cpi opl,0xA0 ; |... or upper nibble >= 0xA0)
+ brlo op_da_a13 ;
+op_da_a12: ;
+ ldi oph,0x60 ; add 6 to lower nibble
+ add opl,oph ;
+ ori temp2,(1<<ZFL_C) ; set new C flag
+op_da_a13: ;
+ ldpmx z_flags, sz53p_tab, opl ; get S,Z,P flag
+ or z_flags,temp2 ; merge new C and H flag
op_end
+
+#if EM_Z80
+
+op_da_sub: ;else (sub-op)
+ rcall do_op_inv ; TODO: !
+ op_end ;endif
+#endif
+
#else
do_op_da:
- sbrc z_flags,ZFL_N ; if add-op
- rjmp do_op_da_sub ; then
- ldi temp2,0 ;
- mov temp,opl ;
- andi temp,0x0f ;
- cpi temp,0x0a ; if lower digit > 9
- brlo do_op_da_h ;
- ori temp2,0x06 ; add 6 to lower digit
-do_op_da_h: ;
- sbrc z_flags,ZFL_H ; ... or H-Flag
- ori temp2,0x06 ;
- add opl,temp2 ;
-
- ldi temp2,0 ;
- mov temp,opl ;
- andi temp,0xf0 ;
- cpi temp,0xa0 ;
- brlo do_op_da_c ;
- ori temp2,0x60 ;
-do_op_da_c: ; else sub-op
- sbrc z_flags,ZFL_C ;
- ori temp2,0x60 ;
- andi z_flags, ~( (1<<ZFL_S) | (1<<ZFL_Z) | (1<<ZFL_H) )
- add opl,temp2 ;
- in temp,SREG ;
- bst temp,AVR_Z ;Z-Flag
- bld z_flags,ZFL_Z ;
- bst temp,AVR_N ;S-Flag
- bst z_flags,ZFL_S ;
- sbrc temp2,5 ;C-Flag, set if 0x06 added
- ori z_flags,(1<<ZFL_C) ;
- ;H-Flag?
- op_end
-
-do_op_da_sub: ;TODO:
- rcall do_op_inv
+ ldi temp2,0 ;new C and H flag
+ ldi oph,0 ;oph: what to add
+
+ sbrc z_flags,ZFL_N ;if add-op
+ rjmp op_da_sub ;then
+op_da_add:
+ mov temp,opl ; |
+ andi temp,0x0f ; |
+ cpi temp,0x0a ; if (lower nibble >= 0x0A)
+ brlo op_da_a10 ; |
+ ori oph,0x06 ; add 6
+ ori temp2,(1<<ZFL_H) ; set new H flag
+
+ sbrc z_flags,ZFL_C ; |
+ rjmp op_da_a02 ; if (C flag ...
+ cpi opl,0x90 ; |... or upper nibble >= 0x90)
+ brlo op_da_a03 ; |
+op_da_a02:
+ ori oph,0x60 ; add 0x60
+ ori temp2,(1<<ZFL_C) ; set new C flag
+op_da_a03: ; endif
+ rjmp op_da_ae
+op_da_a10: ; else (lower nibble is 0x09 or lower)
+ sbrc z_flags,ZFL_C ; |
+ rjmp op_da_a12 ; if (C flag ...
+ cpi opl,0xA0 ; |... or upper nibble >= 0xA0)
+ brlo op_da_a13 ;
+op_da_a12:
+ ori oph,0x60 ; add 0x60
+ ori temp2,(1<<ZFL_C) ; set new C flag
+op_da_a13:
+ sbrs z_flags,ZFL_H ; if (H flag)
+ rjmp op_da_ae ; |
+ ori oph,0x06 ; add 0x06
+ mov temp,opl ; |
+ andi temp,0x0f ; |
+ cpi temp,0x06 ; if (lower nibble >= 0x0A)
+ brsh op_da_ae ; |
+ ori temp2,(1<<ZFL_H) ; set new H flag
+ ; endif
+ ; endif
+op_da_ae:
+ add opl,oph
+ ldpmx z_flags, sz53p_tab, opl ; get S,Z,P flag
+ or z_flags,temp2 ; merge new C and H flag
op_end
+
+op_da_sub: ;else (sub-op)
+ rcall do_op_inv ; TODO: !
+ op_end ;endif
#endif
+
;----------------------------------------------------------------
;|Mnemonic |SZHPNC|Description |Notes |
;----------------------------------------------------------------
;
;
do_op_scf:
- andi z_flags,~((1<<ZFL_H)|(1<<ZFL_N))
+ do_z80_flags_clear_HN
ori z_flags,(1<<ZFL_C)
op_end
;----------------------------------------------------------------
;|Mnemonic |SZHPNC|Description |Notes |
;----------------------------------------------------------------
-;|CCF |--?-0*|Complement Carry Flag|CY=~CY |
+;|CCF |--?-0*|Complement Carry Flag|CY=~CY, HC=previous CY|
;|----------|SZHP C|---------- 8080 ----------------------------|
-;|SCF |---- 1|Set Carry Flag |CY=1 |
+;|CCF |---- 1|Set Carry Flag |CY=1 |
;
-;TODO: H-Flag
do_op_ccf:
do_z80_flags_clear_N
+ do_z80_flags_copy_HC
ldi temp,(1<<ZFL_C)
eor z_flags,temp
op_end
todo_table:
instr do_fetch_nop, op_nop, do_store_nop ;00 ;NOP
instr do_fetch_DIR16, op_nop, do_store_BC ;01 nn nn ;LD BC,nn
-instr do_fetch_A, op_nop, do_store_MBC ;02 ;LD (BC),A
+instr do_fetch_nop, op_nop, do_store_MBC ;02 ;LD (BC),A
instr do_fetch_BC, op_INC16, do_store_BC ;03 ;INC BC
instr do_fetch_B, op_INC, do_store_B ;04 ;INC B
instr do_fetch_B, op_DEC, do_store_B ;05 ;DEC B
instr do_fetch_DIR8, op_nop, do_store_B ;06 ;LD B,n
-instr do_fetch_A, op_RLC, do_store_A ;07 ;RLCA
+instr do_fetch_nop, op_RLCA, do_store_nop ;07 ;RLCA
instr do_fetch_nop, op_INV, do_store_nop ;08 ;EX AF,AF'
instr do_fetch_BC, op_ADDHL, do_store_HL ;09 ;ADD HL,BC
-instr do_fetch_MBC, op_nop, do_store_A ;0A ;LD A,(BC)
+instr do_fetch_MBC, op_nop, do_store_nop ;0A ;LD A,(BC)
instr do_fetch_BC, op_DEC16, do_store_BC ;0B ;DEC BC
instr do_fetch_C, op_INC, do_store_C ;0C ;INC C
instr do_fetch_C, op_DEC, do_store_C ;0D ;DEC C
instr do_fetch_DIR8, op_nop, do_store_C ;0E nn ;LD C,n
-instr do_fetch_A, op_RRC, do_store_A ;0F ;RRCA
+instr do_fetch_nop, op_RRCA, do_store_nop ;0F ;RRCA
instr do_fetch_nop, op_INV, do_store_nop ;10 oo ;DJNZ o
instr do_fetch_DIR16, op_nop, do_store_DE ;11 nn nn ;LD DE,nn
-instr do_fetch_A, op_nop, do_store_MDE ;12 ;LD (DE),A
+instr do_fetch_nop, op_nop, do_store_MDE ;12 ;LD (DE),A
instr do_fetch_DE, op_INC16, do_store_DE ;13 ;INC DE
instr do_fetch_D, op_INC, do_store_D ;14 ;INC D
instr do_fetch_D, op_DEC, do_store_D ;15 ;DEC D
instr do_fetch_DIR8, op_nop, do_store_D ;16 nn ;LD D,n
-instr do_fetch_A, op_RL, do_store_A ;17 ;RLA
+instr do_fetch_nop, op_RLA, do_store_nop ;17 ;RLA
instr do_fetch_nop, op_INV, do_store_nop ;18 oo ;JR o
instr do_fetch_DE, op_ADDHL, do_store_HL ;19 ;ADD HL,DE
-instr do_fetch_MDE, op_nop, do_store_A ;1A ;LD A,(DE)
+instr do_fetch_MDE, op_nop, do_store_nop ;1A ;LD A,(DE)
instr do_fetch_DE, op_DEC16, do_store_DE ;1B ;DEC DE
instr do_fetch_E, op_INC, do_store_E ;1C ;INC E
instr do_fetch_E, op_DEC, do_store_E ;1D ;DEC E
instr do_fetch_DIR8, op_nop, do_store_E ;1E nn ;LD E,n
-instr do_fetch_A, op_RR, do_store_A ;1F ;RRA
+instr do_fetch_nop, op_RRA, do_store_nop ;1F ;RRA
instr do_fetch_nop, op_INV, do_store_nop ;20 oo ;JR NZ,o
instr do_fetch_DIR16, op_nop, do_store_HL ;21 nn nn ;LD HL,nn
instr do_fetch_DIR16, op_STHL, do_store_nop ;22 nn nn ;LD (nn),HL
instr do_fetch_nop, op_DECA, do_store_nop ;3D ;DEC A
instr do_fetch_DIR8, op_nop, do_store_A ;3E nn ;LD A,n
instr do_fetch_nop, op_CCF, do_store_nop ;3F ;CCF (Complement Carry Flag, gvd)
-instr do_fetch_B, op_nop, do_store_B ;40 ;LD B,B
+instr do_fetch_nop, op_nop, do_store_nop ;40 ;LD B,B
instr do_fetch_C, op_nop, do_store_B ;41 ;LD B,C
instr do_fetch_D, op_nop, do_store_B ;42 ;LD B,D
instr do_fetch_E, op_nop, do_store_B ;43 ;LD B,E
instr do_fetch_MHL, op_nop, do_store_B ;46 ;LD B,(HL)
instr do_fetch_A, op_nop, do_store_B ;47 ;LD B,A
instr do_fetch_B, op_nop, do_store_C ;48 ;LD C,B
-instr do_fetch_C, op_nop, do_store_C ;49 ;LD C,C
+instr do_fetch_nop, op_nop, do_store_nop ;49 ;LD C,C
instr do_fetch_D, op_nop, do_store_C ;4A ;LD C,D
instr do_fetch_E, op_nop, do_store_C ;4B ;LD C,E
instr do_fetch_H, op_nop, do_store_C ;4C ;LD C,H
instr do_fetch_A, op_nop, do_store_C ;4F ;LD C,A
instr do_fetch_B, op_nop, do_store_D ;50 ;LD D,B
instr do_fetch_C, op_nop, do_store_D ;51 ;LD D,C
-instr do_fetch_D, op_nop, do_store_D ;52 ;LD D,D
+instr do_fetch_nop, op_nop, do_store_nop ;52 ;LD D,D
instr do_fetch_E, op_nop, do_store_D ;53 ;LD D,E
instr do_fetch_H, op_nop, do_store_D ;54 ;LD D,H
instr do_fetch_L, op_nop, do_store_D ;55 ;LD D,L
instr do_fetch_B, op_nop, do_store_E ;58 ;LD E,B
instr do_fetch_C, op_nop, do_store_E ;59 ;LD E,C
instr do_fetch_D, op_nop, do_store_E ;5A ;LD E,D
-instr do_fetch_E, op_nop, do_store_E ;5B ;LD E,E
+instr do_fetch_nop, op_nop, do_store_nop ;5B ;LD E,E
instr do_fetch_H, op_nop, do_store_E ;5C ;LD E,H
instr do_fetch_L, op_nop, do_store_E ;5D ;LD E,L
instr do_fetch_MHL, op_nop, do_store_E ;5E ;LD E,(HL)
instr do_fetch_C, op_nop, do_store_H ;61 ;LD H,C
instr do_fetch_D, op_nop, do_store_H ;62 ;LD H,D
instr do_fetch_E, op_nop, do_store_H ;63 ;LD H,E
-instr do_fetch_H, op_nop, do_store_H ;64 ;LD H,H
+instr do_fetch_nop, op_nop, do_store_nop ;64 ;LD H,H
instr do_fetch_L, op_nop, do_store_H ;65 ;LD H,L
instr do_fetch_MHL, op_nop, do_store_H ;66 ;LD H,(HL)
instr do_fetch_A, op_nop, do_store_H ;67 ;LD H,A
instr do_fetch_D, op_nop, do_store_L ;6A ;LD L,D
instr do_fetch_E, op_nop, do_store_L ;6B ;LD L,E
instr do_fetch_H, op_nop, do_store_L ;6C ;LD L,H
-instr do_fetch_L, op_nop, do_store_L ;6D ;LD L,L
+instr do_fetch_nop, op_nop, do_store_nop ;6D ;LD L,L
instr do_fetch_MHL, op_nop, do_store_L ;6E ;LD L,(HL)
instr do_fetch_A, op_nop, do_store_L ;6F ;LD L,A
instr do_fetch_B, op_nop, do_store_MHL ;70 ;LD (HL),B
instr do_fetch_H, op_nop, do_store_A ;7C ;LD A,H
instr do_fetch_L, op_nop, do_store_A ;7D ;LD A,L
instr do_fetch_MHL, op_nop, do_store_A ;7E ;LD A,(HL)
-instr do_fetch_A, op_nop, do_store_A ;7F ;LD A,A
+instr do_fetch_nop, op_nop, do_store_nop ;7F ;LD A,A
instr do_fetch_B, op_ADDA, do_store_nop ;80 ;ADD A,B
instr do_fetch_C, op_ADDA, do_store_nop ;81 ;ADD A,C
instr do_fetch_D, op_ADDA, do_store_nop ;82 ;ADD A,D
instr do_fetch_DIR8, op_CPFA, do_store_nop ;FE nn ;CP n
instr do_fetch_RST, op_nop, do_store_CALL ;FF ;RST 38H
+
;----------------------------------------------------------------
; Lookup table, stolen from z80ex, Z80 emulation library.
; http://z80ex.sourceforge.net/
projects / avrcpm.git / blobdiff