src/main/java/com/loomcom/symon/InstructionTable.java - minecraft/thistle - Rivoreo Source Code Repositories

 /*
  * Copyright (c) 2016 Seth J. Morabito <web@loomcom.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice shall be
  * included in all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

 package com.loomcom.symon;

 public interface InstructionTable {

 	/**
 	 * Enumeration of valid CPU behaviors. These determine what behavior and instruction
 	 * set will be simulated, depending on desired version of 6502.
 	 *
 	 * TODO: As of version 0.6, this is still not used! All CPUs are "idealized" NMOS 6502 only.
 	 */
 	enum CpuBehavior {
 		/**
 		 * The earliest NMOS 6502 includes a bug that causes the ROR instruction
 		 * to behave like an ASL that does not affect the carry bit. This version
 		 * is very rare in the wild.
 		 *
 		 * NB: Does NOT implement "unimplemented" NMOS instructions.
 		 */
 		NMOS_WITH_ROR_BUG,

 		/**
 		 * All NMOS 6502's have a bug with the indirect JMP instruction. If the
 		 *
 		 * NB: Does NOT implement "unimplemented" NMOS instructions.
 		 */
 		NMOS_WITH_INDIRECT_JMP_BUG,

 		/**
 		 * Emulate an NMOS 6502 without the indirect JMP bug. This type of 6502
 		 * does not actually exist in the wild.
 		 *
 		 * NB: Does NOT implement "unimplemented" NMOS instructions.
 		 */
 		NMOS_WITHOUT_INDIRECT_JMP_BUG,

 		/**
 		 * Emulate a CMOS 65C02, with all CMOS instructions and addressing modes.
 		 */
 		CMOS
 	}

 	/**
 	 * Enumeration of Addressing Modes.
 	 */
 	enum Mode {
 		ACC {
 			public String toString() {
 				return "Accumulator";
 			}
 		},

 		ABS {
 			public String toString() {
 				return "Absolute";
 			}
 		},

 		ABX {
 			public String toString() {
 				return "Absolute, X-indexed";
 			}
 		},

 		ABY {
 			public String toString() {
 				return "Absolute, Y-indexed";
 			}
 		},

 		IMM {
 			public String toString() {
 				return "Immediate";
 			}
 		},

 		IMP {
 			public String toString() {
 				return "Implied";
 			}
 		},

 		IND {
 			public String toString() {
 				return "Indirect";
 			}
 		},

 		XIN {
 			public String toString() {
 				return "X-indexed Indirect";
 			}
 		},

 		INY {
 			public String toString() {
 				return "Indirect, Y-indexed";
 			}
 		},

 		REL {
 			public String toString() {
 				return "Relative";
 			}
 		},

 		ZPG {
 			public String toString() {
 				return "Zeropage";
 			}
 		},

 		ZPX {
 			public String toString() {
 				return "Zeropage, X-indexed";
 			}
 		},

 		ZPY {
 			public String toString() {
 				return "Zeropage, Y-indexed";
 			}
 		},

 		NUL {
 			public String toString() {
 				return "NULL";
 			}
 		}
 	}

 	// 6502 opcodes.  No 65C02 opcodes implemented.

 	/**
 	 * Instruction opcode names.
 	 */
 	String[] opcodeNames = { "BRK", "ORA", null, null, null, "ORA", "ASL", null, "PHP", "ORA", "ASL", null, null, "ORA", "ASL", null, "BPL", "ORA", null, null, null, "ORA", "ASL", null, "CLC", "ORA", null, null, null, "ORA", "ASL", null, "JSR", "AND", null, null, "BIT", "AND", "ROL", null, "PLP", "AND", "ROL", null, "BIT", "AND", "ROL", null, "BMI", "AND", null, null, null, "AND", "ROL", null, "SEC", "AND", null, null, null, "AND", "ROL", null, "RTI", "EOR", null, null, null, "EOR", "LSR", null, "PHA", "EOR", "LSR", null, "JMP", "EOR", "LSR", null, "BVC", "EOR", null, null, null, "EOR", "LSR", null, "CLI", "EOR", null, null, null, "EOR", "LSR", null, "RTS", "ADC", null, null, null, "ADC", "ROR", null, "PLA", "ADC", "ROR", null, "JMP", "ADC", "ROR", null, "BVS", "ADC", null, null, null, "ADC", "ROR", null, "SEI", "ADC", null, null, null, "ADC", "ROR", null, "BCS", "STA", null, null, "STY", "STA", "STX", null, "DEY", null, "TXA", null, "STY", "STA", "STX", null, "BCC", "STA", null, null, "STY", "STA", "STX", null, "TYA", "STA", "TXS", null, null, "STA", null, null, "LDY", "LDA", "LDX", null, "LDY", "LDA", "LDX", null, "TAY", "LDA", "TAX", null, "LDY", "LDA", "LDX", null, "BCS", "LDA", null, null, "LDY", "LDA", "LDX", null, "CLV", "LDA", "TSX", null, "LDY", "LDA", "LDX", null, "CPY", "CMP", null, null, "CPY", "CMP", "DEC", null, "INY", "CMP", "DEX", null, "CPY", "CMP", "DEC", null, "BNE", "CMP", null, null, null, "CMP", "DEC", null, "CLD", "CMP", null, null, null, "CMP", "DEC", null, "CPX", "SBC", null, null, "CPX", "SBC", "INC", null, "INX", "SBC", "NOP", null, "CPX", "SBC", "INC", null, "BEQ", "SBC", null, null, null, "SBC", "INC", null, "SED", "SBC", null, null, null, "SBC", "INC", null };

 	/**
 	 * Instruction addressing modes.
 	 */
 	Mode[] instructionModes = {
 		Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x00-0x03
 		Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x04-0x07
 		Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x08-0x0b
 		Mode.NUL, Mode.ABS, Mode.ABS, Mode.NUL, // 0x0c-0x0f
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x10-0x13
 		Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x14-0x17
 		Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x18-0x1b
 		Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x1c-0x1f
 		Mode.ABS, Mode.XIN, Mode.NUL, Mode.NUL, // 0x20-0x23
 		Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x24-0x27
 		Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x28-0x2b
 		Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x2c-0x2f
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x30-0x33
 		Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x34-0x37
 		Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x38-0x3b
 		Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x3c-0x3f
 		Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x40-0x43
 		Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x44-0x47
 		Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x48-0x4b
 		Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x4c-0x4f
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x50-0x53
 		Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x54-0x57
 		Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x58-0x5b
 		Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x5c-0x5f
 		Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x60-0x63
 		Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x64-0x67
 		Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x68-0x6b
 		Mode.IND, Mode.ABS, Mode.ABS, Mode.NUL, // 0x6c-0x6f
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x70-0x73
 		Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x74-0x77
 		Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x78-0x7b
 		Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x7c-0x7f
 		Mode.REL, Mode.XIN, Mode.NUL, Mode.NUL, // 0x80-0x83
 		Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x84-0x87
 		Mode.IMP, Mode.NUL, Mode.IMP, Mode.NUL, // 0x88-0x8b
 		Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x8c-0x8f
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x90-0x93
 		Mode.ZPX, Mode.ZPX, Mode.ZPY, Mode.NUL, // 0x94-0x97
 		Mode.IMP, Mode.ABY, Mode.IMP, Mode.NUL, // 0x98-0x9b
 		Mode.NUL, Mode.ABX, Mode.NUL, Mode.NUL, // 0x9c-0x9f
 		Mode.IMM, Mode.XIN, Mode.IMM, Mode.NUL, // 0xa0-0xa3
 		Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xa4-0xa7
 		Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xa8-0xab
 		Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xac-0xaf
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xb0-0xb3
 		Mode.ZPX, Mode.ZPX, Mode.ZPY, Mode.NUL, // 0xb4-0xb7
 		Mode.IMP, Mode.ABY, Mode.IMP, Mode.NUL, // 0xb8-0xbb
 		Mode.ABX, Mode.ABX, Mode.ABY, Mode.NUL, // 0xbc-0xbf
 		Mode.IMM, Mode.XIN, Mode.NUL, Mode.NUL, // 0xc0-0xc3
 		Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xc4-0xc7
 		Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xc8-0xcb
 		Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xcc-0xcf
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xd0-0xd3
 		Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0xd4-0xd7
 		Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0xd8-0xdb
 		Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0xdc-0xdf
 		Mode.IMM, Mode.XIN, Mode.NUL, Mode.NUL, // 0xe0-0xe3
 		Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xe4-0xe7
 		Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xe8-0xeb
 		Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xec-0xef
 		Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xf0-0xf3
 		Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0xf4-0xf7
 		Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0xf8-0xfb
 		Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL  // 0xfc-0xff
 	};

 	/**
 	 * Size, in bytes, required for each instruction.
 	 */
 	int[] instructionSizes = { 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 0, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 3, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 0, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 0, 3, 0, 0, 2, 2, 2, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0 };

 	/**
 	 * Number of clock cycles required for each instruction
 	 */
 	int[] instructionClocks = { 7, 6, 0, 0, 0, 3, 5, 0, 3, 2, 2, 0, 0, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 6, 6, 0, 0, 3, 3, 5, 0, 4, 2, 2, 0, 4, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 6, 6, 0, 0, 0, 3, 5, 0, 3, 2, 2, 0, 3, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 6, 6, 0, 0, 0, 3, 5, 0, 4, 2, 2, 0, 5, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 2, 6, 0, 0, 3, 3, 3, 0, 2, 0, 2, 0, 4, 4, 4, 0, 2, 6, 0, 0, 4, 4, 4, 0, 2, 5, 2, 0, 0, 5, 0, 0, 2, 6, 2, 0, 3, 3, 3, 0, 2, 2, 2, 0, 4, 4, 4, 0, 2, 5, 0, 0, 4, 4, 4, 0, 2, 4, 2, 0, 4, 4, 4, 0, 2, 6, 0, 0, 3, 3, 5, 0, 2, 2, 2, 0, 4, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 2, 6, 0, 0, 3, 3, 5, 0, 2, 2, 2, 0, 4, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0 };

 }
	/*
	* Copyright (c) 2016 Seth J. Morabito <web@loomcom.com>
	*
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sublicense, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice shall be
	* included in all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
	* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	package com.loomcom.symon;

	public interface InstructionTable {

	/**
	* Enumeration of valid CPU behaviors. These determine what behavior and instruction
	* set will be simulated, depending on desired version of 6502.
	*
	* TODO: As of version 0.6, this is still not used! All CPUs are "idealized" NMOS 6502 only.
	*/
	enum CpuBehavior {
	/**
	* The earliest NMOS 6502 includes a bug that causes the ROR instruction
	* to behave like an ASL that does not affect the carry bit. This version
	* is very rare in the wild.
	*
	* NB: Does NOT implement "unimplemented" NMOS instructions.
	*/
	NMOS_WITH_ROR_BUG,

	/**
	* All NMOS 6502's have a bug with the indirect JMP instruction. If the
	*
	* NB: Does NOT implement "unimplemented" NMOS instructions.
	*/
	NMOS_WITH_INDIRECT_JMP_BUG,

	/**
	* Emulate an NMOS 6502 without the indirect JMP bug. This type of 6502
	* does not actually exist in the wild.
	*
	* NB: Does NOT implement "unimplemented" NMOS instructions.
	*/
	NMOS_WITHOUT_INDIRECT_JMP_BUG,

	/**
	* Emulate a CMOS 65C02, with all CMOS instructions and addressing modes.
	*/
	CMOS
	}

	/**
	* Enumeration of Addressing Modes.
	*/
	enum Mode {
	ACC {
	public String toString() {
	return "Accumulator";
	}
	},

	ABS {
	public String toString() {
	return "Absolute";
	}
	},

	ABX {
	public String toString() {
	return "Absolute, X-indexed";
	}
	},

	ABY {
	public String toString() {
	return "Absolute, Y-indexed";
	}
	},

	IMM {
	public String toString() {
	return "Immediate";
	}
	},

	IMP {
	public String toString() {
	return "Implied";
	}
	},

	IND {
	public String toString() {
	return "Indirect";
	}
	},

	XIN {
	public String toString() {
	return "X-indexed Indirect";
	}
	},

	INY {
	public String toString() {
	return "Indirect, Y-indexed";
	}
	},

	REL {
	public String toString() {
	return "Relative";
	}
	},

	ZPG {
	public String toString() {
	return "Zeropage";
	}
	},

	ZPX {
	public String toString() {
	return "Zeropage, X-indexed";
	}
	},

	ZPY {
	public String toString() {
	return "Zeropage, Y-indexed";
	}
	},

	NUL {
	public String toString() {
	return "NULL";
	}
	}
	}

	// 6502 opcodes. No 65C02 opcodes implemented.

	/**
	* Instruction opcode names.
	*/
	String[] opcodeNames = { "BRK", "ORA", null, null, null, "ORA", "ASL", null, "PHP", "ORA", "ASL", null, null, "ORA", "ASL", null, "BPL", "ORA", null, null, null, "ORA", "ASL", null, "CLC", "ORA", null, null, null, "ORA", "ASL", null, "JSR", "AND", null, null, "BIT", "AND", "ROL", null, "PLP", "AND", "ROL", null, "BIT", "AND", "ROL", null, "BMI", "AND", null, null, null, "AND", "ROL", null, "SEC", "AND", null, null, null, "AND", "ROL", null, "RTI", "EOR", null, null, null, "EOR", "LSR", null, "PHA", "EOR", "LSR", null, "JMP", "EOR", "LSR", null, "BVC", "EOR", null, null, null, "EOR", "LSR", null, "CLI", "EOR", null, null, null, "EOR", "LSR", null, "RTS", "ADC", null, null, null, "ADC", "ROR", null, "PLA", "ADC", "ROR", null, "JMP", "ADC", "ROR", null, "BVS", "ADC", null, null, null, "ADC", "ROR", null, "SEI", "ADC", null, null, null, "ADC", "ROR", null, "BCS", "STA", null, null, "STY", "STA", "STX", null, "DEY", null, "TXA", null, "STY", "STA", "STX", null, "BCC", "STA", null, null, "STY", "STA", "STX", null, "TYA", "STA", "TXS", null, null, "STA", null, null, "LDY", "LDA", "LDX", null, "LDY", "LDA", "LDX", null, "TAY", "LDA", "TAX", null, "LDY", "LDA", "LDX", null, "BCS", "LDA", null, null, "LDY", "LDA", "LDX", null, "CLV", "LDA", "TSX", null, "LDY", "LDA", "LDX", null, "CPY", "CMP", null, null, "CPY", "CMP", "DEC", null, "INY", "CMP", "DEX", null, "CPY", "CMP", "DEC", null, "BNE", "CMP", null, null, null, "CMP", "DEC", null, "CLD", "CMP", null, null, null, "CMP", "DEC", null, "CPX", "SBC", null, null, "CPX", "SBC", "INC", null, "INX", "SBC", "NOP", null, "CPX", "SBC", "INC", null, "BEQ", "SBC", null, null, null, "SBC", "INC", null, "SED", "SBC", null, null, null, "SBC", "INC", null };

	/**
	* Instruction addressing modes.
	*/
	Mode[] instructionModes = {
	Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x00-0x03
	Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x04-0x07
	Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x08-0x0b
	Mode.NUL, Mode.ABS, Mode.ABS, Mode.NUL, // 0x0c-0x0f
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x10-0x13
	Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x14-0x17
	Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x18-0x1b
	Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x1c-0x1f
	Mode.ABS, Mode.XIN, Mode.NUL, Mode.NUL, // 0x20-0x23
	Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x24-0x27
	Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x28-0x2b
	Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x2c-0x2f
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x30-0x33
	Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x34-0x37
	Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x38-0x3b
	Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x3c-0x3f
	Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x40-0x43
	Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x44-0x47
	Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x48-0x4b
	Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x4c-0x4f
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x50-0x53
	Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x54-0x57
	Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x58-0x5b
	Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x5c-0x5f
	Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x60-0x63
	Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x64-0x67
	Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x68-0x6b
	Mode.IND, Mode.ABS, Mode.ABS, Mode.NUL, // 0x6c-0x6f
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x70-0x73
	Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x74-0x77
	Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x78-0x7b
	Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x7c-0x7f
	Mode.REL, Mode.XIN, Mode.NUL, Mode.NUL, // 0x80-0x83
	Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x84-0x87
	Mode.IMP, Mode.NUL, Mode.IMP, Mode.NUL, // 0x88-0x8b
	Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x8c-0x8f
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x90-0x93
	Mode.ZPX, Mode.ZPX, Mode.ZPY, Mode.NUL, // 0x94-0x97
	Mode.IMP, Mode.ABY, Mode.IMP, Mode.NUL, // 0x98-0x9b
	Mode.NUL, Mode.ABX, Mode.NUL, Mode.NUL, // 0x9c-0x9f
	Mode.IMM, Mode.XIN, Mode.IMM, Mode.NUL, // 0xa0-0xa3
	Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xa4-0xa7
	Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xa8-0xab
	Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xac-0xaf
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xb0-0xb3
	Mode.ZPX, Mode.ZPX, Mode.ZPY, Mode.NUL, // 0xb4-0xb7
	Mode.IMP, Mode.ABY, Mode.IMP, Mode.NUL, // 0xb8-0xbb
	Mode.ABX, Mode.ABX, Mode.ABY, Mode.NUL, // 0xbc-0xbf
	Mode.IMM, Mode.XIN, Mode.NUL, Mode.NUL, // 0xc0-0xc3
	Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xc4-0xc7
	Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xc8-0xcb
	Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xcc-0xcf
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xd0-0xd3
	Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0xd4-0xd7
	Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0xd8-0xdb
	Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0xdc-0xdf
	Mode.IMM, Mode.XIN, Mode.NUL, Mode.NUL, // 0xe0-0xe3
	Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xe4-0xe7
	Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xe8-0xeb
	Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xec-0xef
	Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xf0-0xf3
	Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0xf4-0xf7
	Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0xf8-0xfb
	Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL // 0xfc-0xff
	};

	/**
	* Size, in bytes, required for each instruction.
	*/
	int[] instructionSizes = { 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 0, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 3, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 0, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 0, 3, 0, 0, 2, 2, 2, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0, 2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0, 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0 };

	/**
	* Number of clock cycles required for each instruction
	*/
	int[] instructionClocks = { 7, 6, 0, 0, 0, 3, 5, 0, 3, 2, 2, 0, 0, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 6, 6, 0, 0, 3, 3, 5, 0, 4, 2, 2, 0, 4, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 6, 6, 0, 0, 0, 3, 5, 0, 3, 2, 2, 0, 3, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 6, 6, 0, 0, 0, 3, 5, 0, 4, 2, 2, 0, 5, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 2, 6, 0, 0, 3, 3, 3, 0, 2, 0, 2, 0, 4, 4, 4, 0, 2, 6, 0, 0, 4, 4, 4, 0, 2, 5, 2, 0, 0, 5, 0, 0, 2, 6, 2, 0, 3, 3, 3, 0, 2, 2, 2, 0, 4, 4, 4, 0, 2, 5, 0, 0, 4, 4, 4, 0, 2, 4, 2, 0, 4, 4, 4, 0, 2, 6, 0, 0, 3, 3, 5, 0, 2, 2, 2, 0, 4, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0, 2, 6, 0, 0, 3, 3, 5, 0, 2, 2, 2, 0, 4, 4, 6, 0, 2, 5, 0, 0, 0, 4, 6, 0, 2, 4, 0, 0, 0, 4, 7, 0 };

	}