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Try to match technical behavior described for JSR/RTS

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This commit is contained in:
Peter Evans 2018-01-21 01:17:04 -06:00
parent 0581ed6b44
commit 5f93bdae25
1 changed files with 2 additions and 1 deletions
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3
src/mos6502.exec.c
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@ -37,7 +37,7 @@ DEFINE_INST(jmp)
*/ */
DEFINE_INST(jsr) DEFINE_INST(jsr)
{ {
vm_16bit pc3 = cpu->PC + 3; vm_16bit pc3 = cpu->PC + 2;
mos6502_push_stack(cpu, pc3 >> 8); mos6502_push_stack(cpu, pc3 >> 8);
mos6502_push_stack(cpu, pc3 & 0xff); mos6502_push_stack(cpu, pc3 & 0xff);
@ -72,4 +72,5 @@ DEFINE_INST(rts)
{ {
cpu->PC = mos6502_pop_stack(cpu); cpu->PC = mos6502_pop_stack(cpu);
cpu->PC |= mos6502_pop_stack(cpu) << 8; cpu->PC |= mos6502_pop_stack(cpu) << 8;
cpu->PC++;
} }