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update spc700::SBCM

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scawful
2024-04-24 10:06:31 -04:00
parent adb9a8df2d
commit 0525782cf5
1 changed files with 10 additions and 46 deletions
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56
src/app/emu/audio/internal/instructions.cc
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@@ -57,18 +57,6 @@ void Spc700::ADC(uint16_t adr) {
PSW.N = (A & 0x80); PSW.N = (A & 0x80);
} }
// void spc_adcm(uint16_t dst, uint8_t value) {
// uint8_t applyOn = read(dst);
// int result = applyOn + value + PSW.C;
// spc->v =
// (applyOn & 0x80) == (value & 0x80) && (value & 0x80) != (result &
// 0x80);
// PSW.H = ((applyOn & 0xf) + (value & 0xf) + PSW.C) > 0xf;
// PSW.C = result > 0xff;
// spc_write(dst, result);
// spc_setZN(result);
// }
void Spc700::ADCM(uint16_t& dest, uint8_t operand) { void Spc700::ADCM(uint16_t& dest, uint8_t operand) {
uint8_t applyOn = read(dest); uint8_t applyOn = read(dest);
int result = applyOn + operand + PSW.C; int result = applyOn + operand + PSW.C;
@@ -79,18 +67,8 @@ void Spc700::ADCM(uint16_t& dest, uint8_t operand) {
write(dest, result); write(dest, result);
PSW.Z = ((result & 0xFF) == 0); PSW.Z = ((result & 0xFF) == 0);
PSW.N = (result & 0x80); PSW.N = (result & 0x80);
// dest = result & 0xFF;
} }
// void spc_sbcm(uint16_t dst, uint8_t value) {
// value ^= 0xff;
// uint8_t applyOn = read(dst);
// int result = applyOn + value + PSW.C;
// spc->v = (applyOn & 0x80) == (value & 0x80) && (value & 0x80) != (result &
// 0x80); PSW.H = ((applyOn & 0xf) + (value & 0xf) + PSW.C) > 0xf; PSW.C =
// result > 0xff; spc_write(dst, result); spc_setZN(result);
// }
void Spc700::SBC(uint16_t adr) { void Spc700::SBC(uint16_t adr) {
uint8_t value = read(adr) ^ 0xff; uint8_t value = read(adr) ^ 0xff;
int result = A + value + PSW.C; int result = A + value + PSW.C;
@@ -103,13 +81,16 @@ void Spc700::SBC(uint16_t adr) {
} }
void Spc700::SBCM(uint16_t& dest, uint8_t operand) { void Spc700::SBCM(uint16_t& dest, uint8_t operand) {
uint8_t value = read(dest) - operand - (1 - PSW.C); operand ^= 0xff;
PSW.V = ((read(dest) ^ value) & (read(dest) ^ operand) & 0x80); uint8_t applyOn = read(dest);
PSW.C = (value < 0x100); int result = applyOn + operand + PSW.C;
PSW.Z = ((value & 0xFF) == 0); PSW.V = (applyOn & 0x80) == (operand & 0x80) &&
PSW.N = (value & 0x80); (operand & 0x80) != (operand & 0x80);
PSW.H = ((read(dest) ^ operand ^ value) & 0x10); PSW.H = ((applyOn & 0xF) + (operand & 0xF) + PSW.C) > 0xF;
write(dest, value); PSW.C = result > 0xFF;
write(dest, result);
PSW.Z = ((A & 0xFF) == 0);
PSW.N = (A & 0x80);
} }
void Spc700::CMPX(uint16_t adr) { void Spc700::CMPX(uint16_t adr) {
@@ -145,12 +126,6 @@ void Spc700::CMP(uint16_t adr) {
PSW.N = (result & 0x80); PSW.N = (result & 0x80);
} }
// void spc_andm(uint16_t dst, uint8_t value) {
// uint8_t result = read(dst) & value;
// spc_write(dst, result);
// spc_setZN(result);
// }
void Spc700::AND(uint16_t adr) { void Spc700::AND(uint16_t adr) {
A &= read(adr); A &= read(adr);
PSW.Z = (A == 0); PSW.Z = (A == 0);
@@ -164,17 +139,6 @@ void Spc700::ANDM(uint16_t dest, uint8_t operand) {
PSW.N = (result & 0x80); PSW.N = (result & 0x80);
} }
// void spc_or(uint16_t adr) {
// A |= read(adr);
// spc_setZN(A);
// }
// void spc_orm(uint16_t dst, uint8_t value) {
// uint8_t result = read(dst) | value;
// spc_write(dst, result);
// spc_setZN(result);
// }
void Spc700::OR(uint16_t adr) { void Spc700::OR(uint16_t adr) {
A |= read(adr); A |= read(adr);
PSW.Z = (A == 0); PSW.Z = (A == 0);