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opcode.c
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opcode.c
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/*
* $Id: opcode.c,v 1.2 2007/07/22 13:33:26 khansen Exp $
* $Log: opcode.c,v $
* Revision 1.2 2007/07/22 13:33:26 khansen
* convert tabs to whitespaces
*
* Revision 1.1 2004/06/30 07:55:46 kenth
* Initial revision
*
*/
/**
* (C) 2004 Kent Hansen
*
* The XORcyst is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* The XORcyst is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with The XORcyst; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* This file contains functions for converting 6502 instruction mnemonics from
* an enumerated type to actual 6502 opcodes, getting zeropage-equivalent opcode
* of an absolute-mode opcode, getting instruction lengths, mnemonic strings ...
*/
#include "opcode.h"
/**
* Gets the opcode that a pair of (mnemonic, addressing mode) maps to.
* @param mnc Instruction mnemonic
* @param amode Addressing mode
* @return Valid opcode byte, or 0xFF if mnc and amode are an invalid combination
*/
unsigned char opcode_get(instr_mnemonic mnc, addressing_mode amode)
{
/* 56 instructions, 13 addressing modes. */
static unsigned char opcode_lookup[56][13] = {
/* ADC_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0x69,
/* ZEROPAGE_MODE */ 0x65,
/* ZEROPAGE_X_MODE */ 0x75,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x6D,
/* ABSOLUTE_X_MODE */ 0x7D,
/* ABSOLUTE_Y_MODE */ 0x79,
/* PREINDEXED_INDIRECT_MODE */ 0x61,
/* POSTINDEXED_INDIRECT_MODE */ 0x71,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* AND_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0x29,
/* ZEROPAGE_MODE */ 0x25,
/* ZEROPAGE_X_MODE */ 0x35,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x2D,
/* ABSOLUTE_X_MODE */ 0x3D,
/* ABSOLUTE_Y_MODE */ 0x39,
/* PREINDEXED_INDIRECT_MODE */ 0x21,
/* POSTINDEXED_INDIRECT_MODE */ 0x31,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* ASL_MNEMONIC */
{
/* IMPLIED_MODE */ 0x0A,
/* ACCUMULATOR_MODE */ 0x0A,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x06,
/* ZEROPAGE_X_MODE */ 0x16,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x0E,
/* ABSOLUTE_X_MODE */ 0x1E,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* BCC_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0x90
},
/* BCS_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xB0
},
/* BEQ_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xF0
},
/* BIT_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x24,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x2C,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* BMI_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0x30
},
/* BNE_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xD0
},
/* BPL_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0x10
},
/* BRK_MNEMONIC */
{
/* IMPLIED_MODE */ 0x00,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* BVC_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0x50
},
/* BVS_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0x70
},
/* CLC_MNEMONIC */
{
/* IMPLIED_MODE */ 0x18,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* CLD_MNEMONIC */
{
/* IMPLIED_MODE */ 0xD8,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* CLI_MNEMONIC */
{
/* IMPLIED_MODE */ 0x58,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* CLV_MNEMONIC */
{
/* IMPLIED_MODE */ 0xB8,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* CMP_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xC9,
/* ZEROPAGE_MODE */ 0xC5,
/* ZEROPAGE_X_MODE */ 0xD5,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xCD,
/* ABSOLUTE_X_MODE */ 0xDD,
/* ABSOLUTE_Y_MODE */ 0xD9,
/* PREINDEXED_INDIRECT_MODE */ 0xC1,
/* POSTINDEXED_INDIRECT_MODE */ 0xD1,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* CPX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xE0,
/* ZEROPAGE_MODE */ 0xE4,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xEC,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* CPY_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xC0,
/* ZEROPAGE_MODE */ 0xC4,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xCC,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* DEC_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xC6,
/* ZEROPAGE_X_MODE */ 0xD6,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xCE,
/* ABSOLUTE_X_MODE */ 0xDE,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* DEX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xCA,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* DEY_MNEMONIC */
{
/* IMPLIED_MODE */ 0x88,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* EOR_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0x49,
/* ZEROPAGE_MODE */ 0x45,
/* ZEROPAGE_X_MODE */ 0x55,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x4D,
/* ABSOLUTE_X_MODE */ 0x5D,
/* ABSOLUTE_Y_MODE */ 0x59,
/* PREINDEXED_INDIRECT_MODE */ 0x41,
/* POSTINDEXED_INDIRECT_MODE */ 0x51,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* INC_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xE6,
/* ZEROPAGE_X_MODE */ 0xF6,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xEE,
/* ABSOLUTE_X_MODE */ 0xFE,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* INX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xE8,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* INY_MNEMONIC */
{
/* IMPLIED_MODE */ 0xC8,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* JMP_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x4C,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0x6C,
/* RELATIVE_MODE */ 0xFF
},
/* JSR_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x20,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* LDA_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xA9,
/* ZEROPAGE_MODE */ 0xA5,
/* ZEROPAGE_X_MODE */ 0xB5,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xAD,
/* ABSOLUTE_X_MODE */ 0xBD,
/* ABSOLUTE_Y_MODE */ 0xB9,
/* PREINDEXED_INDIRECT_MODE */ 0xA1,
/* POSTINDEXED_INDIRECT_MODE */ 0xB1,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* LDX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xA2,
/* ZEROPAGE_MODE */ 0xA6,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xB6,
/* ABSOLUTE_MODE */ 0xAE,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xBE,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* LDY_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xA0,
/* ZEROPAGE_MODE */ 0xA4,
/* ZEROPAGE_X_MODE */ 0xB4,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xAC,
/* ABSOLUTE_X_MODE */ 0xBC,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* LSR_MNEMONIC */
{
/* IMPLIED_MODE */ 0x4A,
/* ACCUMULATOR_MODE */ 0x4A,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x46,
/* ZEROPAGE_X_MODE */ 0x56,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x4E,
/* ABSOLUTE_X_MODE */ 0x5E,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* NOP_MNEMONIC */
{
/* IMPLIED_MODE */ 0xEA,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* ORA_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0x09,
/* ZEROPAGE_MODE */ 0x05,
/* ZEROPAGE_X_MODE */ 0x15,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x0D,
/* ABSOLUTE_X_MODE */ 0x1D,
/* ABSOLUTE_Y_MODE */ 0x19,
/* PREINDEXED_INDIRECT_MODE */ 0x01,
/* POSTINDEXED_INDIRECT_MODE */ 0x11,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* PHA_MNEMONIC */
{
/* IMPLIED_MODE */ 0x48,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* PHP_MNEMONIC */
{
/* IMPLIED_MODE */ 0x08,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* PLA_MNEMONIC */
{
/* IMPLIED_MODE */ 0x68,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* PLP_MNEMONIC */
{
/* IMPLIED_MODE */ 0x28,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* ROL_MNEMONIC */
{
/* IMPLIED_MODE */ 0x2A,
/* ACCUMULATOR_MODE */ 0x2A,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x26,
/* ZEROPAGE_X_MODE */ 0x36,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x2E,
/* ABSOLUTE_X_MODE */ 0x3E,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* ROR_MNEMONIC */
{
/* IMPLIED_MODE */ 0x6A,
/* ACCUMULATOR_MODE */ 0x6A,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x66,
/* ZEROPAGE_X_MODE */ 0x76,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x6E,
/* ABSOLUTE_X_MODE */ 0x7E,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* RTI_MNEMONIC */
{
/* IMPLIED_MODE */ 0x40,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* RTS_MNEMONIC */
{
/* IMPLIED_MODE */ 0x60,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* SBC_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xE9,
/* ZEROPAGE_MODE */ 0xE5,
/* ZEROPAGE_X_MODE */ 0xF5,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xED,
/* ABSOLUTE_X_MODE */ 0xFD,
/* ABSOLUTE_Y_MODE */ 0xF9,
/* PREINDEXED_INDIRECT_MODE */ 0xE1,
/* POSTINDEXED_INDIRECT_MODE */ 0xF1,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* SEC_MNEMONIC */
{
/* IMPLIED_MODE */ 0x38,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* SED_MNEMONIC */
{
/* IMPLIED_MODE */ 0xF8,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* SEI_MNEMONIC */
{
/* IMPLIED_MODE */ 0x78,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* STA_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x85,
/* ZEROPAGE_X_MODE */ 0x95,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x8D,
/* ABSOLUTE_X_MODE */ 0x9D,
/* ABSOLUTE_Y_MODE */ 0x99,
/* PREINDEXED_INDIRECT_MODE */ 0x81,
/* POSTINDEXED_INDIRECT_MODE */ 0x91,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* STX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x86,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0x96,
/* ABSOLUTE_MODE */ 0x8E,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* STY_MNEMONIC */
{
/* IMPLIED_MODE */ 0xFF,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0x84,
/* ZEROPAGE_X_MODE */ 0x94,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0x8C,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* TAX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xAA,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* TAY_MNEMONIC */
{
/* IMPLIED_MODE */ 0xA8,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* TSX_MNEMONIC */
{
/* IMPLIED_MODE */ 0xBA,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* TXA_MNEMONIC */
{
/* IMPLIED_MODE */ 0x8A,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* TXS_MNEMONIC */
{
/* IMPLIED_MODE */ 0x9A,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
},
/* TYA_MNEMONIC */
{
/* IMPLIED_MODE */ 0x98,
/* ACCUMULATOR_MODE */ 0xFF,
/* IMMEDIATE_MODE */ 0xFF,
/* ZEROPAGE_MODE */ 0xFF,
/* ZEROPAGE_X_MODE */ 0xFF,
/* ZEROPAGE_Y_MODE */ 0xFF,
/* ABSOLUTE_MODE */ 0xFF,
/* ABSOLUTE_X_MODE */ 0xFF,
/* ABSOLUTE_Y_MODE */ 0xFF,
/* PREINDEXED_INDIRECT_MODE */ 0xFF,
/* POSTINDEXED_INDIRECT_MODE */ 0xFF,
/* INDIRECT_MODE */ 0xFF,
/* RELATIVE_MODE */ 0xFF
}
};
/* */
return opcode_lookup[mnc][amode];
}
/**
* Gets the length of an instruction, in bytes, given an opcode.
* The length includes the opcode (1 byte) and operand (0, 1 or 2 bytes).
* @param op Operation code
*/
int opcode_length(unsigned char op)
{
/* Lookup-table indexed by opcode */
static int length_lookup[] = {
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,
0, 2, 0, 0, 2, 2, 2, 0, 1, 1, 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
};
/* */
return length_lookup[op];
}
/**
* Gets the zeropage-equivalent opcode of an absolute-mode opcode, if such a
* conversion is possible.
* @param op Opcode
* @return Equivalent opcode, or 0xFF if one does not exist
*/
unsigned char opcode_zp_equiv(unsigned char op)
{
switch (op) {
case 0x6D: return 0x65; /* ADC oper */
case 0x7D: return 0x75; /* ADC oper,X */
case 0x2D: return 0x25; /* AND oper */
case 0x3D: return 0x35; /* AND oper,X */
case 0x0E: return 0x06; /* ASL oper */
case 0x1E: return 0x16; /* ASL oper,X */
case 0x2C: return 0x24; /* BIT oper */
case 0xCD: return 0xC5; /* CMP oper */
case 0xDD: return 0xD5; /* CMP oper,X */
case 0xEC: return 0xE4; /* CPX oper */
case 0xCC: return 0xC4; /* CPY oper */
case 0xCE: return 0xC6; /* DEC oper */
case 0xDE: return 0xD6; /* DEC oper,X */