Apple-2-SW/Applerm-II
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dec and inc was swapped, and results are not stored correctly

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This commit is contained in:
Takashi Toyoshima 2014-12-07 15:10:05 +09:00
parent c3c8eafc07
commit c5d69f2c14
1 changed files with 4 additions and 6 deletions
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6502.S
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@ -451,20 +451,18 @@
.endm
.macro _dec
mov r0, RA
adds r0, r0, #1
subs r0, r0, #1
uxtb r0, r0
mov RA, r0
_flag_nz
mov T0, r0
adds PC, PC, #1
.endm
.macro _inc
mov r0, RA
subs r0, r0, #1
adds r0, r0, #1
uxtb r0, r0
mov RA, r0
_flag_nz
mov T0, r0
adds PC, PC, #1
.endm