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add experimental single-cycle step control to spc700

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scawful
2024-05-11 13:56:19 -04:00
parent d42421a5a6
commit a6907044bd
3 changed files with 57 additions and 25 deletions
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18
src/app/emu/audio/internal/instructions.cc
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@@ -20,18 +20,24 @@ void Spc700::MOVY(uint16_t adr) {
}
void Spc700::MOVS(uint16_t adr) {
read(adr);
write(adr, A);
switch (bstep) {
case 0: read(adr); break;
case 1: write(adr, A); bstep = 0; break;
}
}
void Spc700::MOVSX(uint16_t adr) {
read(adr);
write(adr, X);
switch (bstep) {
case 0: read(adr); break;
case 1: write(adr, X); bstep = 0; break;
}
}
void Spc700::MOVSY(uint16_t adr) {
read(adr);
write(adr, Y);
switch (bstep) {
case 0: read(adr); break;
case 1: write(adr, Y); bstep = 0; break;
}
}
void Spc700::MOV(uint16_t adr) {