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fix for COM/COMB (test with 0117400)

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folkert van heusden 2022-03-20 02:18:23 +01:00
parent be5c619982
commit 7eec8c3520
1 changed files with 11 additions and 10 deletions
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21
cpu.cpp
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@ -520,7 +520,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
case 4: { // XOR (word only)
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
uint16_t vl = b->read(a, false) ^ getRegister(reg);;
uint16_t vl = b->read(a, false) ^ getRegister(reg);
if (dst_mode == 0)
putGAM(dst_mode, dst_reg, false, vl, false);
@ -609,21 +609,22 @@ bool cpu::single_operand_instructions(const uint16_t instr)
case 0b000101001: // COM/COMB
a = getGAMAddress(dst_mode, dst_reg, word_mode, false);
vl = b -> read(a, word_mode);
if (word_mode)
vl ^= 0xff;
else
vl ^= 0xffff;
v = b -> read(a, word_mode);
setPSW_n(SIGN(vl, word_mode));
setPSW_z(vl == 0);
if (word_mode)
v ^= 0xff;
else
v ^= 0xffff;
setPSW_n(SIGN(v, word_mode));
setPSW_z(v == 0);
setPSW_v(false);
setPSW_c(true);
if (dst_mode == 0)
putGAM(dst_mode, dst_reg, word_mode, vl, false);
putGAM(dst_mode, dst_reg, word_mode, v, false);
else
b -> write(a, word_mode, vl);
b -> write(a, word_mode, v);
break;