/***************************************************************************** * * pps4dasm.c * * Rockwell PPS-4 CPU Disassembly * * Initial version by Miodrag Milanovic * *****************************************************************************/ #include "emu.h" #define OP(A) oprom[(A) - PC] #define ARG(A) opram[(A) - PC] CPU_DISASSEMBLE( pps4 ) { UINT32 flags = 0; unsigned PC = pc; UINT8 op; switch (op = OP(pc++)) { // Arithmetic instructions case 0x0b: sprintf (buffer,"ad"); break; case 0x0a: sprintf (buffer,"adc"); break; case 0x09: sprintf (buffer,"adsk"); break; case 0x08: sprintf (buffer,"adcsk"); break; case 0x60: case 0x61: case 0x62: case 0x63: case 0x64: case 0x66: case 0x67: case 0x68: case 0x69: case 0x6a: case 0x6b: case 0x6c: case 0x6d: case 0x6e: sprintf (buffer,"adi %01x",(op & 0x0f)); break; case 0x65: sprintf (buffer,"dc"); break; // Logical instructions case 0x0d: sprintf (buffer,"and"); break; case 0x0f: sprintf (buffer,"or"); break; case 0x0c: sprintf (buffer,"eor"); break; case 0x0e: sprintf (buffer,"comp"); break; // Data transfer instructions case 0x20: sprintf (buffer,"sc"); break; case 0x24: sprintf (buffer,"rc"); break; case 0x22: sprintf (buffer,"sf1"); break; case 0x26: sprintf (buffer,"rf1"); break; case 0x21: sprintf (buffer,"sf2"); break; case 0x25: sprintf (buffer,"rf2"); break; case 0x30: case 0x31: case 0x32: case 0x33: case 0x34: case 0x35: case 0x36: case 0x37: sprintf (buffer,"ld %01x",(op & 0x07)); break; case 0x38: case 0x39: case 0x3a: case 0x3b: case 0x3c: case 0x3d: case 0x3e: case 0x3f: sprintf (buffer,"ex %01x",(op & 0x07)); break; case 0x28: case 0x29: case 0x2a: case 0x2b: case 0x2c: case 0x2d: case 0x2e: case 0x2f: sprintf (buffer,"exd %01x",(op & 0x07)); break; case 0x70: case 0x71: case 0x72: case 0x73: case 0x74: case 0x75: case 0x76: case 0x77: sprintf (buffer,"ldi %01x",(op & 0x0f)); break; case 0x12: sprintf (buffer,"lax"); break; case 0x1b: sprintf (buffer,"lxa"); break; case 0x11: sprintf (buffer,"labl"); break; case 0x10: sprintf (buffer,"lbmx"); break; case 0x04: sprintf (buffer,"lbua"); break; case 0x19: sprintf (buffer,"xabl"); break; case 0x18: sprintf (buffer,"xbmx"); break; case 0x1a: sprintf (buffer,"xax"); break; case 0x06: sprintf (buffer,"xs"); break; case 0x6f: sprintf (buffer,"cys"); break; case 0xc0: case 0xc1: case 0xc2: case 0xc3: case 0xc4: case 0xc5: case 0xc6: case 0xc7: case 0xc8: case 0xc9: case 0xca: case 0xcb: case 0xcc: case 0xcd: case 0xce: case 0xcf: sprintf (buffer,"lb %02x",ARG(pc)); pc++; break; case 0x00: sprintf (buffer,"lbl %02x",ARG(pc)); pc++; break; case 0x17: sprintf (buffer,"incb"); break; case 0x1f: sprintf (buffer,"decb"); break; // Control transfer instructions case 0x80: case 0x81: case 0x82: case 0x83: case 0x84: case 0x85: case 0x86: case 0x87: case 0x88: case 0x89: case 0x8a: case 0x8b: case 0x8c: case 0x8d: case 0x8e: case 0x8f: case 0x90: case 0x91: case 0x92: case 0x93: case 0x94: case 0x95: case 0x96: case 0x97: case 0x98: case 0x99: case 0x9a: case 0x9b: case 0x9c: case 0x9d: case 0x9e: case 0x9f: case 0xa0: case 0xa1: case 0xa2: case 0xa3: case 0xa4: case 0xa5: case 0xa6: case 0xa7: case 0xa8: case 0xa9: case 0xaa: case 0xab: case 0xac: case 0xad: case 0xae: case 0xaf: case 0xb0: case 0xb1: case 0xb2: case 0xb3: case 0xb4: case 0xb5: case 0xb6: case 0xb7: case 0xb8: case 0xb9: case 0xba: case 0xbb: case 0xbc: case 0xbd: case 0xbe: case 0xbf: sprintf (buffer,"t %02x",(op & 0x3f)); break; case 0xd0: case 0xd1: case 0xd2: case 0xd3: case 0xd4: case 0xd5: case 0xd6: case 0xd7: case 0xd8: case 0xd9: case 0xda: case 0xdb: case 0xdc: case 0xdd: case 0xde: case 0xdf: case 0xe0: case 0xe1: case 0xe2: case 0xe3: case 0xe4: case 0xe5: case 0xe6: case 0xe7: case 0xe8: case 0xe9: case 0xea: case 0xeb: case 0xec: case 0xed: case 0xee: case 0xef: case 0xf0: case 0xf1: case 0xf2: case 0xf3: case 0xf4: case 0xf5: case 0xf6: case 0xf7: case 0xf8: case 0xf9: case 0xfa: case 0xfb: case 0xfc: case 0xfd: case 0xfe: case 0xff: sprintf (buffer,"tm %02x %02x",(op & 0x3f),ARG(pc)); pc++; break; case 0x50: case 0x51: case 0x52: case 0x53: case 0x54: case 0x55: case 0x56: case 0x57: case 0x58: case 0x59: case 0x5a: case 0x5b: case 0x5c: case 0x5d: case 0x5e: case 0x5f: sprintf (buffer,"tl %01x %02x",(op & 0x0f),ARG(pc)); pc++; break; case 0x01: case 0x02: case 0x03: sprintf (buffer,"tml %02x",ARG(pc)); pc++; break; case 0x15: sprintf (buffer,"skc"); break; case 0x1e: sprintf (buffer,"skz"); break; case 0x40: case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x46: case 0x47: case 0x48: case 0x49: case 0x4a: case 0x4b: case 0x4c: case 0x4d: case 0x4e: case 0x4f: sprintf (buffer,"skbi %01x",(op & 0x0f)); break; case 0x16: sprintf (buffer,"skf1"); break; case 0x14: sprintf (buffer,"skf2"); break; case 0x05: sprintf (buffer,"rtn"); break; case 0x07: sprintf (buffer,"rtnsk"); break; // Input/Output instructions case 0x1c: sprintf (buffer,"iol %02x",ARG(pc)); pc++; break; case 0x27: sprintf (buffer,"dia"); break; case 0x23: sprintf (buffer,"dib"); break; case 0x1d: sprintf (buffer,"doa"); break; // Special instructions case 0x13: sprintf (buffer,"sag"); break; } return (pc - PC) | flags | DASMFLAG_SUPPORTED; }