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11/70 has no MTPS instruction

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folkert van heusden 2023-03-19 21:49:48 +01:00
parent 35eed8e117
commit 1677c9be1b
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 4 additions and 1 deletions
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5
cpu.cpp
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@ -1291,8 +1291,12 @@ bool cpu::single_operand_instructions(const uint16_t instr)
case 0b000110100: // MARK/MTPS (put something in PSW)
if (word_mode) { // MTPS
#if 0 // not in the PDP-11/70
psw &= 0xff00; // only alter lower 8 bits
psw |= getGAM(dst_mode, dst_reg, word_mode, false).value.value() & 0xef; // can't change bit 4
#else
trap(010);
#endif
}
else {
setRegister(6, getPC() + dst * 2);
@ -1301,7 +1305,6 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setRegister(5, popStack());
}
break;
case 0b000110111: { // MFPS (get PSW to something) / SXT