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/*****************************************************************************
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* Intel 4004 CPU Disassembly
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* Initial version by Miodrag Milanovic
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*****************************************************************************/
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#define OP(A) oprom[(A) - PC]
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#define ARG(A) opram[(A) - PC]
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CPU_DISASSEMBLE( i4004 )
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UINT16 page = PC & 0x0f00;
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switch (op = OP(pc++))
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case 0x00: sprintf (buffer,"nop"); break;
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case 0x11: sprintf (buffer,"jnt $%03x",page | ARG(pc)); pc++; break;
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case 0x12: sprintf (buffer,"jc $%03x",page | ARG(pc)); pc++; break;
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case 0x14: sprintf (buffer,"jz $%03x",page | ARG(pc)); pc++; break;
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case 0x19: sprintf (buffer,"jt $%03x",page | ARG(pc)); pc++; break;
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case 0x1a: sprintf (buffer,"jnc $%03x",page | ARG(pc)); pc++; break;
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case 0x1c: sprintf (buffer,"jnz $%03x",page | ARG(pc)); pc++; break;
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case 0x10: case 0x13: case 0x15: case 0x16:
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case 0x17: case 0x18: case 0x1b: case 0x1d:
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sprintf (buffer,"jcn $%01x,$%03x",op & 0x0f,page | ARG(pc)); pc++; break;
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case 0x20: case 0x22: case 0x24: case 0x26:
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case 0x28: case 0x2a: case 0x2c: case 0x2e:
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sprintf (buffer,"fim $%01x,$%02x",op & 0x0f,OP(pc)); pc++; break;
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case 0x21: case 0x23: case 0x25: case 0x27:
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case 0x29: case 0x2b: case 0x2d: case 0x2f:
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sprintf (buffer,"src $%01x",(op & 0x0f)-1); break;
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case 0x30: case 0x32: case 0x34: case 0x36:
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case 0x38: case 0x3a: case 0x3c: case 0x3e:
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sprintf (buffer,"fin $%01x",op & 0x0f); break;
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case 0x31: case 0x33: case 0x35: case 0x37:
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case 0x39: case 0x3b: case 0x3d: case 0x3f:
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sprintf (buffer,"jin $%01x",(op & 0x0f)-1); break;
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case 0x40: case 0x41: case 0x42: case 0x43:
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case 0x44: case 0x45: case 0x46: case 0x47:
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case 0x48: case 0x49: case 0x4a: case 0x4b:
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case 0x4c: case 0x4d: case 0x4e: case 0x4f:
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sprintf (buffer,"jun $%01x%02x",op & 0x0f,ARG(pc)); pc++; break;
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case 0x50: case 0x51: case 0x52: case 0x53:
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case 0x54: case 0x55: case 0x56: case 0x57:
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case 0x58: case 0x59: case 0x5a: case 0x5b:
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case 0x5c: case 0x5d: case 0x5e: case 0x5f:
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sprintf (buffer,"jms $%01x%02x",op & 0x0f,ARG(pc)); pc++; break;
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case 0x60: case 0x61: case 0x62: case 0x63:
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case 0x64: case 0x65: case 0x66: case 0x67:
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case 0x68: case 0x69: case 0x6a: case 0x6b:
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case 0x6c: case 0x6d: case 0x6e: case 0x6f:
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sprintf (buffer,"inc $%01x",op & 0x0f); break;
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case 0x70: case 0x71: case 0x72: case 0x73:
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case 0x74: case 0x75: case 0x76: case 0x77:
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case 0x78: case 0x79: case 0x7a: case 0x7b:
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case 0x7c: case 0x7d: case 0x7e: case 0x7f:
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sprintf (buffer,"isz $%01x,%03x",op & 0x0f,page | ARG(pc)); pc++; break;
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case 0x80: case 0x81: case 0x82: case 0x83:
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case 0x84: case 0x85: case 0x86: case 0x87:
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case 0x88: case 0x89: case 0x8a: case 0x8b:
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case 0x8c: case 0x8d: case 0x8e: case 0x8f:
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sprintf (buffer,"add $%01x",op & 0x0f); break;
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case 0x90: case 0x91: case 0x92: case 0x93:
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case 0x94: case 0x95: case 0x96: case 0x97:
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case 0x98: case 0x99: case 0x9a: case 0x9b:
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case 0x9c: case 0x9d: case 0x9e: case 0x9f:
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sprintf (buffer,"sub $%01x",op & 0x0f); break;
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case 0xa0: case 0xa1: case 0xa2: case 0xa3:
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case 0xa4: case 0xa5: case 0xa6: case 0xa7:
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case 0xa8: case 0xa9: case 0xaa: case 0xab:
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case 0xac: case 0xad: case 0xae: case 0xaf:
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sprintf (buffer,"ld $%01x",op & 0x0f); break;
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case 0xb0: case 0xb1: case 0xb2: case 0xb3:
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case 0xb4: case 0xb5: case 0xb6: case 0xb7:
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case 0xb8: case 0xb9: case 0xba: case 0xbb:
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case 0xbc: case 0xbd: case 0xbe: case 0xbf:
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sprintf (buffer,"xch $%01x",op & 0x0f); break;
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case 0xc0: case 0xc1: case 0xc2: case 0xc3:
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case 0xc4: case 0xc5: case 0xc6: case 0xc7:
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case 0xc8: case 0xc9: case 0xca: case 0xcb:
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case 0xcc: case 0xcd: case 0xce: case 0xcf:
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sprintf (buffer,"bbl $%01x",op & 0x0f); break;
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case 0xd0: case 0xd1: case 0xd2: case 0xd3:
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case 0xd4: case 0xd5: case 0xd6: case 0xd7:
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case 0xd8: case 0xd9: case 0xda: case 0xdb:
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case 0xdc: case 0xdd: case 0xde: case 0xdf:
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sprintf (buffer,"ldm $%01x",op & 0x0f); break;
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case 0xe0: sprintf (buffer,"wrm"); break;
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case 0xe1: sprintf (buffer,"wmp"); break;
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case 0xe2: sprintf (buffer,"wrr"); break;
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case 0xe3: sprintf (buffer,"wpm"); break;
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case 0xe4: sprintf (buffer,"wr0"); break;
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case 0xe5: sprintf (buffer,"wr1"); break;
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case 0xe6: sprintf (buffer,"wr2"); break;
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case 0xe7: sprintf (buffer,"wr3"); break;
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case 0xe8: sprintf (buffer,"sbm"); break;
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case 0xe9: sprintf (buffer,"rdm"); break;
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case 0xea: sprintf (buffer,"rdr"); break;
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case 0xeb: sprintf (buffer,"adm"); break;
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case 0xec: sprintf (buffer,"rd0"); break;
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case 0xed: sprintf (buffer,"rd1"); break;
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case 0xee: sprintf (buffer,"rd2"); break;
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case 0xef: sprintf (buffer,"rd3"); break;
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case 0xf0: sprintf (buffer,"clb"); break;
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case 0xf1: sprintf (buffer,"clc"); break;
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case 0xf2: sprintf (buffer,"iac"); break;
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case 0xf3: sprintf (buffer,"cmc"); break;
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case 0xf4: sprintf (buffer,"cma"); break;
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case 0xf5: sprintf (buffer,"ral"); break;
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case 0xf6: sprintf (buffer,"rar"); break;
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case 0xf7: sprintf (buffer,"tcc"); break;
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case 0xf8: sprintf (buffer,"dac"); break;
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case 0xf9: sprintf (buffer,"tcs"); break;
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case 0xfa: sprintf (buffer,"stc"); break;
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case 0xfb: sprintf (buffer,"daa"); break;
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case 0xfc: sprintf (buffer,"kbp"); break;
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case 0xfd: sprintf (buffer,"dcl"); break;
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default : sprintf (buffer,"illegal"); break;
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return (pc - PC) | flags | DASMFLAG_SUPPORTED;
added
removed
src/emu/cpu/i4004/4004dasm.c
