// license:BSD-3-Clause // copyright-holders:Joakim Larsson Edstrom // thanks-to: Jeff Laughton /* Diablo 1300 series Printer TTL CPU disassembler The work is based on the RE done by Jeff Laughton http://laughtonelectronics.com/Arcana/Diablo%20CPU/DiabloCPU.html */ #include "emu.h" #include "diablo1300dasm.h" u32 diablo1300_disassembler::opcode_alignment() const { return 1; } offs_t diablo1300_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) { uint16_t op = opcodes.r16(pc); switch (op & 0x0007) { case 0: // OUTPUT Dport, Sreg util::stream_format(stream, "OUTPUT dv%d, r%02X", (op & 0x0070) >> 4, ((op & 0x0f00) >> 8) + ((op & 0x0008) ? 0x10 : 0)); break; case 1: // JNC Addr util::stream_format(stream, "JNC %03X", ((op & 0xff00) >> 8) + ((op & 0x0008) ? 0x100 : 0)); break; case 2: // RST #Dport util::stream_format(stream, "RST dv%d", (op & 0x0700) >> 8); break; case 3: // LDBBIT Sreg, #val util::stream_format(stream, "LDBBIT r%02X, %02X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0), (op & 0xff00) >> 8); break; case 4: // switch (op & 0xc000) { case 0x4000: // XLAT Dreg util::stream_format(stream, "XLAT r%02X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0)); break; case 0xc000: // MOVCPL Dreg, Sreg util::stream_format(stream, "MOVCPL r%02X, r%02X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0), ((op & 0x0f00) >> 8) + ((op & 0x0008) ? 0x10 : 0)); break; case 0x8000: // INPUT Dreg, Sport util::stream_format(stream, "INPUT r%02X, dv%X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0), ((op & 0x0f00) >> 8)); break; default: util::stream_format(stream, "???"); break; } break; case 5: // LOAD# Dreg,#val util::stream_format(stream, "LOAD# r%02X, %02X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0), (op & 0xff00) >> 8); break; case 6: // ADCCPL S/Dreg, Sreg util::stream_format(stream, "ADCCPL r%02X, r%02X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0), ((op & 0x0f00) >> 8) + ((op & 0x0008) ? 0x10 : 0)); break; case 7: // ADC# S/Dreg, val util::stream_format(stream, "ADC# r%02X, %02X", ((op & 0x00f0) >> 4) + ((op & 0x0008) ? 0x10 : 0), (op & 0xff00) >> 8); break; default: util::stream_format(stream, "???"); break; } return 1 | SUPPORTED; }