717 lines
32 KiB
C#
717 lines
32 KiB
C#
// <copyright file="Disassembler.cs" company="Adrian Conlon">
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// Copyright (c) Adrian Conlon. All rights reserved.
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// </copyright>
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namespace EightBit
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{
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using System.Text;
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public class Disassembler
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{
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private readonly Bus bus;
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private readonly M6502 processor;
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private readonly Symbols symbols;
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private ushort address;
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public Disassembler(Bus bus, M6502 processor, Symbols symbols)
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{
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this.bus = bus;
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this.processor = processor;
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this.symbols = symbols;
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}
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public static string DumpFlags(byte value)
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{
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var returned = new StringBuilder();
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returned.Append((value & (byte)StatusBits.NF) != 0 ? "N" : "-");
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returned.Append((value & (byte)StatusBits.VF) != 0 ? "O" : "-");
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returned.Append((value & (byte)StatusBits.RF) != 0 ? "R" : "-");
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returned.Append((value & (byte)StatusBits.BF) != 0 ? "B" : "-");
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returned.Append((value & (byte)StatusBits.DF) != 0 ? "D" : "-");
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returned.Append((value & (byte)StatusBits.IF) != 0 ? "I" : "-");
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returned.Append((value & (byte)StatusBits.ZF) != 0 ? "Z" : "-");
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returned.Append((value & (byte)StatusBits.CF) != 0 ? "C" : "-");
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return returned.ToString();
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}
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public static string DumpByteValue(byte value) => value.ToString("X2");
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public static string DumpWordValue(ushort value) => value.ToString("X4");
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public string Disassemble(ushort current)
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{
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this.address = current;
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var output = new StringBuilder();
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var cell = this.bus.Peek(current);
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output.Append(DumpByteValue(cell));
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output.Append(" ");
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var next = this.bus.Peek((ushort)(current + 1));
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var relative = (ushort)(this.processor.PC.Word + 2 + (sbyte)next);
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var aaa = (cell & 0b11100000) >> 5;
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var bbb = (cell & 0b00011100) >> 2;
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var cc = cell & 0b00000011;
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switch (cc)
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{
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case 0b00:
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switch (aaa)
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{
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case 0b000:
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switch (bbb)
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{
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case 0b000: // BRK
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output.Append(Disassemble_Implied("BRK"));
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break;
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case 0b001: // DOP/NOP (0x04)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b010: // PHP
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output.Append(Disassemble_Implied("PHP"));
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break;
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case 0b011: // TOP/NOP (0b00001100, 0x0c)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b100: // BPL
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output.Append(this.Disassemble_Relative("BPL", relative));
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break;
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case 0b101: // DOP/NOP (0x14)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b110: // CLC
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output.Append(Disassemble_Implied("CLC"));
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break;
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case 0b111: // TOP/NOP (0b00011100, 0x1c)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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default:
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throw new System.InvalidOperationException("Illegal instruction");
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}
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break;
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case 0b001:
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switch (bbb)
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{
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case 0b000: // JSR
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output.Append(this.Disassemble_Absolute("JSR"));
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break;
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case 0b010: // PLP
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output.Append(Disassemble_Implied("PLP"));
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break;
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case 0b100: // BMI
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output.Append(this.Disassemble_Relative("BMI", relative));
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break;
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case 0b101: // DOP/NOP (0x34)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b110: // SEC
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output.Append(Disassemble_Implied("SEC"));
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break;
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case 0b111: // TOP/NOP (0b00111100, 0x3c)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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default: // BIT
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output.Append(this.Disassemble_AM_00(bbb, "BIT"));
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break;
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}
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break;
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case 0b010:
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switch (bbb)
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{
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case 0b000: // RTI
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output.Append(Disassemble_Implied("RTI"));
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break;
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case 0b001: // DOP/NOP (0x44)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b010: // PHA
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output.Append(Disassemble_Implied("PHA"));
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break;
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case 0b011: // JMP
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output.Append(this.Disassemble_Absolute("JMP"));
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break;
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case 0b100: // BVC
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output.Append(this.Disassemble_Relative("BVC", relative));
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break;
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case 0b101: // DOP/NOP (0x54)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b110: // CLI
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output.Append(Disassemble_Implied("CLI"));
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break;
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case 0b111: // TOP/NOP (0b01011100, 0x5c)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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default:
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throw new System.InvalidOperationException("Illegal addressing mode");
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}
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break;
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case 0b011:
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switch (bbb)
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{
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case 0b000: // RTS
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output.Append(Disassemble_Implied("RTS"));
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break;
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case 0b001: // DOP/NOP (0x64)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b010: // PLA
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output.Append(Disassemble_Implied("PLA"));
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break;
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case 0b011: // JMP (abs)
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output.Append(this.Disassemble_Indirect("JMP"));
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break;
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case 0b100: // BVS
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output.Append(this.Disassemble_Relative("BVS", relative));
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break;
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case 0b101: // DOP/NOP (0x74)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b110: // SEI
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output.Append(Disassemble_Implied("SEI"));
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break;
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case 0b111: // TOP/NOP (0b01111100, 0x7c)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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default:
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throw new System.InvalidOperationException("Illegal addressing mode");
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}
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break;
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case 0b100:
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switch (bbb)
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{
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case 0b000: // DOP/NOP (0x80)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b010: // DEY
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output.Append(Disassemble_Implied("DEY"));
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break;
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case 0b100: // BCC
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output.Append(this.Disassemble_Relative("BCC", relative));
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break;
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case 0b110: // TYA
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output.Append(Disassemble_Implied("TYA"));
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break;
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default: // STY
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output.Append(this.Disassemble_AM_00(bbb, "STY"));
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break;
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}
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break;
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case 0b101:
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switch (bbb)
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{
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case 0b010: // TAY
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output.Append(Disassemble_Implied("TAY"));
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break;
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case 0b100: // BCS
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output.Append(this.Disassemble_Relative("BCS", relative));
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break;
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case 0b110: // CLV
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output.Append(Disassemble_Implied("CLV"));
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break;
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default: // LDY
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output.Append(this.Disassemble_AM_00(bbb, "LDY"));
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break;
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}
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break;
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case 0b110:
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switch (bbb)
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{
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case 0b010: // INY
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output.Append(Disassemble_Implied("INY"));
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break;
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case 0b100: // BNE
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output.Append(this.Disassemble_Relative("BNE", relative));
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break;
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case 0b101: // DOP/NOP (0xd4)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b110: // CLD
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output.Append(Disassemble_Implied("CLD"));
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break;
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case 0b111: // TOP/NOP (0b11011100, 0xdc)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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default: // CPY
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output.Append(this.Disassemble_AM_00(bbb, "CPY"));
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break;
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}
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break;
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case 0b111:
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switch (bbb)
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{
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case 0b010: // INX
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output.Append(Disassemble_Implied("INX"));
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break;
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case 0b100: // BEQ
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output.Append(this.Disassemble_Relative("BEQ", relative));
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break;
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case 0b101: // DOP/NOP (0xf4)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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case 0b110: // SED
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output.Append(Disassemble_Implied("SED"));
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break;
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case 0b111: // TOP/NOP (0b11111100, 0xfc)
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output.Append(this.Disassemble_AM_00(bbb, "*NOP"));
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break;
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default: // CPX
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output.Append(this.Disassemble_AM_00(bbb, "CPX"));
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break;
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}
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break;
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}
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break;
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case 0b01:
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switch (aaa)
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{
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case 0b000: // ORA
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output.Append(this.Disassemble_AM_01(bbb, "ORA"));
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break;
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case 0b001: // AND
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output.Append(this.Disassemble_AM_01(bbb, "AND"));
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break;
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case 0b010: // EOR
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output.Append(this.Disassemble_AM_01(bbb, "EOR"));
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break;
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case 0b011: // ADC
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output.Append(this.Disassemble_AM_01(bbb, "ADC"));
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break;
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case 0b100: // STA
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output.Append(this.Disassemble_AM_01(bbb, "STA"));
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break;
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case 0b101: // LDA
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output.Append(this.Disassemble_AM_01(bbb, "LDA"));
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break;
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case 0b110: // CMP
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output.Append(this.Disassemble_AM_01(bbb, "CMP"));
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break;
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case 0b111: // SBC
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output.Append(this.Disassemble_AM_01(bbb, "SBC"));
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break;
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default:
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throw new System.InvalidOperationException("Illegal addressing mode");
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}
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break;
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case 0b10:
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switch (aaa)
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{
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case 0b000: // ASL
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switch (bbb)
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{
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case 0b110: // 0x1a
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output.Append(Disassemble_Implied("*NOP"));
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break;
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default:
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output.Append(this.Disassemble_AM_10(bbb, "ASL"));
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break;
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}
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break;
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case 0b001: // ROL
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switch (bbb)
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{
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case 0b110: // 0x3a
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output.Append(Disassemble_Implied("*NOP"));
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break;
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default:
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output.Append(this.Disassemble_AM_10(bbb, "ROL"));
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break;
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}
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break;
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case 0b010: // LSR
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switch (bbb)
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{
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case 0b110: // 0x5a
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output.Append(Disassemble_Implied("*NOP"));
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break;
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default:
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output.Append(this.Disassemble_AM_10(bbb, "LSR"));
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break;
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}
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break;
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case 0b011: // ROR
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switch (bbb)
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{
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case 0b110: // 0x7a
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output.Append(Disassemble_Implied("*NOP"));
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break;
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default:
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output.Append(this.Disassemble_AM_10(bbb, "ROR"));
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break;
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}
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break;
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case 0b100:
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switch (bbb)
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{
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case 0b010: // TXA
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output.Append(Disassemble_Implied("TXA"));
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break;
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case 0b110: // TXS
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output.Append(Disassemble_Implied("TXS"));
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break;
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default: // STX
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output.Append(this.Disassemble_AM_10_x(bbb, "STX"));
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break;
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}
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break;
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case 0b101:
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switch (bbb)
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{
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case 0b010: // TAX
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output.Append(Disassemble_Implied("TAX"));
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break;
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case 0b110: // TSX
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output.Append(Disassemble_Implied("TSX"));
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break;
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default: // LDX
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output.Append(this.Disassemble_AM_10_x(bbb, "LDX"));
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break;
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}
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break;
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case 0b110:
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switch (bbb)
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{
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case 0b010: // DEX
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output.Append(Disassemble_Implied("DEX"));
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break;
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case 0b110: // 0xda
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output.Append(Disassemble_Implied("*NOP"));
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break;
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default: // DEC
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output.Append(this.Disassemble_AM_10(bbb, "DEC"));
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break;
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}
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break;
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case 0b111:
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switch (bbb)
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{
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case 0b010: // NOP
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output.Append(Disassemble_Implied("NOP"));
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break;
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case 0b110: // 0xfa
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output.Append(Disassemble_Implied("*NOP"));
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break;
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default: // INC
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output.Append(this.Disassemble_AM_10(bbb, "INC"));
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break;
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}
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break;
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default:
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throw new System.InvalidOperationException("Illegal instruction");
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}
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break;
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case 0b11:
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switch (aaa)
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{
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case 0b000:
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switch (bbb)
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{
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case 0b010:
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output.Append(this.Disassemble_Immediate("*AAC"));
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break;
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default:
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output.Append(this.Disassemble_AM_01(bbb, "*SLO"));
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break;
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}
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break;
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case 0b001:
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switch (bbb)
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{
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case 0b010:
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output.Append(this.Disassemble_Immediate("*AAC"));
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break;
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default:
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output.Append(this.Disassemble_AM_01(bbb, "*RLA"));
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break;
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}
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break;
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case 0b010:
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output.Append(this.Disassemble_AM_01(bbb, "*SRE"));
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break;
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case 0b011:
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output.Append(this.Disassemble_AM_01(bbb, "*RRA"));
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break;
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case 0b100:
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output.Append(this.Disassemble_AM_11(bbb, "*SAX"));
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break;
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case 0b101:
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output.Append(this.Disassemble_AM_11(bbb, "*LAX"));
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break;
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case 0b110:
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output.Append(this.Disassemble_AM_11_x(bbb, "*DCP"));
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break;
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case 0b111:
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switch (bbb)
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{
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case 0b000: // *ISB
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case 0b001:
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case 0b011:
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case 0b100:
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case 0b101:
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case 0b110:
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case 0b111:
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output.Append(this.Disassemble_AM_01(bbb, "*ISB"));
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break;
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case 0b010:
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output.Append(this.Disassemble_AM_11(bbb, "*SBC"));
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break;
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default:
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throw new System.InvalidOperationException("Impossible addressing mode");
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}
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break;
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default:
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throw new System.InvalidOperationException("Illegal instruction group");
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}
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break;
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default:
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throw new System.InvalidOperationException("Impossible instruction");
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}
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return output.ToString();
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}
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private string ConvertAddress(ushort absolute) => this.symbols.Labels.TryGetValue(absolute, out var label) ? label : "$" + DumpWordValue(absolute);
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private string ConvertAddress(byte absolute) => this.symbols.Labels.TryGetValue(absolute, out var label) ? label : "$" + DumpByteValue(absolute);
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private string ConvertConstant(ushort constant) => this.symbols.Constants.TryGetValue(constant, out var label) ? label : this.Dump_DByte(constant);
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private string ConvertConstant(byte constant) => this.symbols.Constants.TryGetValue(constant, out var label) ? label : DumpByteValue(constant);
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private byte GetByte(ushort absolute) => this.bus.Peek(absolute);
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private ushort GetWord(ushort absolute) => this.processor.PeekWord(absolute).Word;
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private string Dump_Byte(ushort absolute) => Disassembler.DumpByteValue(this.GetByte(absolute));
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private string Dump_DByte(ushort absolute) => this.Dump_Byte(absolute) + " " + this.Dump_Byte(++absolute);
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private string Dump_Word(ushort absolute) => Disassembler.DumpWordValue(this.GetWord(absolute));
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private static string Disassemble_Implied(string instruction) => "\t" + instruction;
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private string Disassemble_Absolute(string instruction) => this.AM_Absolute_dump() + "\t" + instruction + " " + this.AM_Absolute();
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private string Disassemble_Indirect(string instruction) => this.AM_Absolute_dump() + "\t" + instruction + " (" + this.AM_Absolute() + ")";
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private string Disassemble_Relative(string instruction, ushort absolute) => this.AM_Immediate_dump() + "\t" + instruction + " $" + Disassembler.DumpWordValue(absolute);
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private string Disassemble_Immediate(string instruction) => this.AM_Immediate_dump() + "\t" + instruction + " " + this.AM_Immediate();
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private string Disassemble_AM_00(int bbb, string instruction) => this.AM_00_dump(bbb) + "\t" + instruction + " " + this.AM_00(bbb);
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private string Disassemble_AM_01(int bbb, string instruction) => this.AM_01_dump(bbb) + "\t" + instruction + " " + this.AM_01(bbb);
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private string Disassemble_AM_10(int bbb, string instruction) => this.AM_10_dump(bbb) + "\t" + instruction + " " + this.AM_10(bbb);
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private string Disassemble_AM_10_x(int bbb, string instruction) => this.AM_10_x_dump(bbb) + "\t" + instruction + " " + this.AM_10_x(bbb);
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private string Disassemble_AM_11(int bbb, string instruction) => this.AM_11_dump(bbb) + "\t" + instruction + " " + this.AM_11(bbb);
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private string Disassemble_AM_11_x(int bbb, string instruction) => this.AM_11_x_dump(bbb) + "\t" + instruction + " " + this.AM_11_x(bbb);
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private string AM_Immediate_dump() => this.Dump_Byte((ushort)(this.address + 1));
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private string AM_Immediate() => "#$" + this.AM_Immediate_dump();
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private string AM_Absolute_dump() => this.Dump_DByte((ushort)(this.address + 1));
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private string AM_Absolute() => "$" + this.Dump_Word((ushort)(this.address + 1));
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private string AM_ZeroPage_dump() => this.Dump_Byte((ushort)(this.address + 1));
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private string AM_ZeroPage() => "$" + this.Dump_Byte((ushort)(this.address + 1));
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private string AM_ZeroPageX_dump() => this.AM_ZeroPage_dump();
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private string AM_ZeroPageX() => this.AM_ZeroPage() + ",X";
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private string AM_ZeroPageY_dump() => this.AM_ZeroPage_dump();
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private string AM_ZeroPageY() => this.AM_ZeroPage() + ",Y";
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private string AM_AbsoluteX_dump() => this.AM_Absolute_dump();
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private string AM_AbsoluteX() => this.AM_Absolute() + ",X";
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private string AM_AbsoluteY_dump() => this.AM_Absolute_dump();
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private string AM_AbsoluteY() => this.AM_Absolute() + ",Y";
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private string AM_IndexedIndirectX_dump() => this.AM_ZeroPage_dump();
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private string AM_IndexedIndirectX() => "($" + this.Dump_Byte((ushort)(this.address + 1)) + ",X)";
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private string AM_IndirectIndexedY_dump() => this.AM_ZeroPage_dump();
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private string AM_IndirectIndexedY() => "($" + this.Dump_Byte((ushort)(this.address + 1)) + "),Y";
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private string AM_00_dump(int bbb) => bbb switch
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{
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0b000 => this.AM_Immediate_dump(),
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0b001 => this.AM_ZeroPage_dump(),
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0b011 => this.AM_Absolute_dump(),
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0b101 => this.AM_ZeroPageX_dump(),
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0b111 => this.AM_AbsoluteX_dump(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_00(int bbb) => bbb switch
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{
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0b000 => this.AM_Immediate(),
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0b001 => this.AM_ZeroPage(),
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0b011 => this.AM_Absolute(),
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0b101 => this.AM_ZeroPageX(),
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0b111 => this.AM_AbsoluteX(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_01_dump(int bbb) => bbb switch
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{
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0b000 => this.AM_IndexedIndirectX_dump(),
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0b001 => this.AM_ZeroPage_dump(),
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0b010 => this.AM_Immediate_dump(),
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0b011 => this.AM_Absolute_dump(),
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0b100 => this.AM_IndirectIndexedY_dump(),
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0b101 => this.AM_ZeroPageX_dump(),
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0b110 => this.AM_AbsoluteY_dump(),
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0b111 => this.AM_AbsoluteX_dump(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_01(int bbb) => bbb switch
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{
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0b000 => this.AM_IndexedIndirectX(),
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0b001 => this.AM_ZeroPage(),
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0b010 => this.AM_Immediate(),
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0b011 => this.AM_Absolute(),
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0b100 => this.AM_IndirectIndexedY(),
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0b101 => this.AM_ZeroPageX(),
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0b110 => this.AM_AbsoluteY(),
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0b111 => this.AM_AbsoluteX(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_10_dump(int bbb) => bbb switch
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{
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0b000 => this.AM_Immediate_dump(),
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0b001 => this.AM_ZeroPage_dump(),
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0b010 => string.Empty,
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0b011 => this.AM_Absolute_dump(),
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0b101 => this.AM_ZeroPageX_dump(),
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0b111 => this.AM_AbsoluteX_dump(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_10(int bbb) => bbb switch
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{
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0b000 => this.AM_Immediate(),
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0b001 => this.AM_ZeroPage(),
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0b010 => "A",
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0b011 => this.AM_Absolute(),
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0b101 => this.AM_ZeroPageX(),
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0b111 => this.AM_AbsoluteX(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_10_x_dump(int bbb) => bbb switch
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{
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0b000 => this.AM_Immediate_dump(),
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0b001 => this.AM_ZeroPage_dump(),
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0b010 => string.Empty,
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0b011 => this.AM_Absolute_dump(),
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0b101 => this.AM_ZeroPageY_dump(),
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0b111 => this.AM_AbsoluteY_dump(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_10_x(int bbb) => bbb switch
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{
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0b000 => this.AM_Immediate(),
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0b001 => this.AM_ZeroPage(),
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0b010 => "A",
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0b011 => this.AM_Absolute(),
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0b101 => this.AM_ZeroPageY(),
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0b111 => this.AM_AbsoluteY(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_11_dump(int bbb) => bbb switch
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{
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0b000 => this.AM_IndexedIndirectX_dump(),
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0b001 => this.AM_ZeroPage_dump(),
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0b010 => this.AM_Immediate_dump(),
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0b011 => this.AM_Absolute_dump(),
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0b100 => this.AM_IndirectIndexedY_dump(),
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0b101 => this.AM_ZeroPageY_dump(),
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0b111 => this.AM_AbsoluteY_dump(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_11_x_dump(int bbb) => bbb switch
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{
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0b000 => this.AM_IndexedIndirectX_dump(),
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0b001 => this.AM_ZeroPage_dump(),
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0b010 => this.AM_Immediate_dump(),
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0b011 => this.AM_Absolute_dump(),
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0b100 => this.AM_IndirectIndexedY_dump(),
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0b101 => this.AM_ZeroPageX_dump(),
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0b110 => this.AM_AbsoluteY_dump(),
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0b111 => this.AM_AbsoluteX_dump(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_11(int bbb) => bbb switch
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{
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0b000 => this.AM_IndexedIndirectX(),
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0b001 => this.AM_ZeroPage(),
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0b010 => this.AM_Immediate(),
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0b011 => this.AM_Absolute(),
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0b100 => this.AM_IndirectIndexedY(),
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0b101 => this.AM_ZeroPageY(),
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0b111 => this.AM_AbsoluteY(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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};
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private string AM_11_x(int bbb) => bbb switch
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{
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0b000 => this.AM_IndexedIndirectX(),
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0b001 => this.AM_ZeroPage(),
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0b010 => this.AM_Immediate(),
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0b011 => this.AM_Absolute(),
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0b100 => this.AM_IndirectIndexedY(),
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0b101 => this.AM_ZeroPageX(),
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0b110 => this.AM_AbsoluteY(),
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0b111 => this.AM_AbsoluteX(),
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_ => throw new System.InvalidOperationException("Illegal addressing mode"),
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|
};
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}
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}
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