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hphybrid: fixed indirect EXE instruction

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This commit is contained in:
fulivi 2016-10-05 18:02:19 +02:00
parent 7657035662
commit d030ab2755
1 changed files with 16 additions and 8 deletions
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10
src/devices/cpu/hphybrid/hphybrid.cpp
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@ -265,7 +265,15 @@ UINT16 hp_hybrid_cpu_device::execute_one(UINT16 opcode)
if ((opcode & 0x7fe0) == 0x7000) {
// EXE
m_icount -= 8;
return RM(opcode & 0x1f);
// Indirect addressing in EXE instruction seems to use AEC case A instead of case C
// (because it's an opcode fetch)
UINT16 reg = RM(opcode & 0x1f);
if (BIT(opcode , 15)) {
m_icount -= 6;
return RM(add_mae(AEC_CASE_A , reg));
} else {
return reg;
}
} else {
m_reg_P = execute_one_sub(opcode);
return fetch();