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more Z80 work

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FeralChild64 authored and FeralChild64 committed 2021-01-26 00:03:07 +01:00
1 parent 24b3f9ebdb
commit 76ed769d7b
7 files changed
+608 -210
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src/zvm_m65/z80_instr_block.s
+67
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@@ -2,3 +2,70 @@
;
; Z80 block processing and search instructions
;
Z80_instr_ED_A0: ; LDI
lda REG_F
and #($FF - Z80_HF - Z80_PF - Z80_NF)
sta REG_F
jsr (VEC_fetch_via_HL)
jsr (VEC_store_via_DE)
inw REG_HL
inw REG_DE
dew REG_BC
+beq ZVM_next
+Z80_PUT_1_VF
jmp ZVM_next
Z80_instr_ED_B0: ; LDIR
lda REG_F
and #($FF - Z80_HF - Z80_PF - Z80_NF)
sta REG_F
@1:
jsr (VEC_fetch_via_HL)
jsr (VEC_store_via_DE)
inw REG_HL
inw REG_DE
dew REG_BC
bne @1
jmp ZVM_next
Z80_instr_ED_A8: ; LDD
lda REG_F
and #($FF - Z80_HF - Z80_PF - Z80_NF)
sta REG_F
jsr (VEC_fetch_via_HL)
jsr (VEC_store_via_DE)
dew REG_HL
dew REG_DE
dew REG_BC
+beq ZVM_next
+Z80_PUT_1_VF
jmp ZVM_next
Z80_instr_ED_B8: ; LDDR
lda REG_F
and #($FF - Z80_HF - Z80_PF - Z80_NF)
sta REG_F
@1:
jsr (VEC_fetch_via_HL)
jsr (VEC_store_via_DE)
dew REG_HL
dew REG_DE
dew REG_BC
bne @1
jmp ZVM_next