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upd7725: handle the LSB-first load from SI properly, for when SI gets hooked up in the future. [Lord Nightmare]

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Lord-Nightmare 2017-03-15 19:40:47 -04:00
parent 5fc90274cf
commit eb597834dc
1 changed files with 2 additions and 2 deletions
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src/devices/cpu/upd7725/upd7725.cpp
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@ -372,8 +372,8 @@ void necdsp_device::exec_op(uint32_t opcode) {
case 8: regs.idb = regs.dr; regs.sr.rqm = 1; break;
case 9: regs.idb = regs.dr; break;
case 10: regs.idb = regs.sr; break;
case 11: regs.idb = regs.si; break; //MSB
case 12: regs.idb = regs.si; break; //LSB
case 11: regs.idb = regs.si; break; //MSB = first bit in from serial, 'natural' SI register order
case 12: regs.idb = BITSWAP16(regs.si, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15); break; //LSB = first bit in from serial, 'reversed' SI register order
case 13: regs.idb = regs.k; break;
case 14: regs.idb = regs.l; break;
case 15: regs.idb = dataRAM[regs.dp]; break;