com.monkeycoder.monkeynes.hardware
Class NesOpCodeTable

java.lang.Object
  |
  +--com.monkeycoder.monkeynes.hardware.NesOpCodeTable

public class NesOpCodeTable

extends Object

This class contains every shred of information available about every OpCode supported by the NES. Its arrays and helper functions are intended for static access.

Originally part of the MonkeyNES project.

Author:

David Stephens

Field Summary

static int[]	bt_cycles This is the Branch Taken extra cycles count.
static int[]	cycles The base number of machine cycles each OpCode requires to complete.
static int[]	length The length in bytes of each OpCode.
static int[]	mode The mode in which each OpCode operates.
static int	MODE_ABSOLUTE
static int	MODE_ABSOLUTE_X
static int	MODE_ABSOLUTE_Y
static int	MODE_ACCUMULATOR
static int	MODE_COUNT
static int	MODE_IMMEDIATE
static int	MODE_IMPLIED
static int	MODE_INDIRECT
static int	MODE_INDIRECT_X
static int	MODE_INDIRECT_Y
static int	MODE_RELATIVE
static int	MODE_UNKNOWN
static int	MODE_ZERO_PAGE
static int	MODE_ZERO_PAGE_X
static int	MODE_ZERO_PAGE_Y
static String[]	name The 6502 assembly name of the OpCode.
static int[]	pb_cycles This is the Page Boundry Crossing Extra Cycle Count.

Constructor Summary

NesOpCodeTable()

Method Summary

static int	getOpCodeBySyntax(String baseOp, String params) Returns the OpCode index value from a 6502 assembly statement based on the syntax of that statement.
static String	getParam(String in) Returns just the actual hex value portion of a paramater from the full 6502 formatted parameter String.
static String	getSyntaxFormatted(int opCodeNum, int inByte1, int inByte2) Produces a String containing the 6502 assembly language version of an OpCode and its parameters.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MODE_UNKNOWN

public static final int MODE_UNKNOWN

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Constant Field Values

MODE_IMPLIED

public static final int MODE_IMPLIED

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Constant Field Values

MODE_ACCUMULATOR

public static final int MODE_ACCUMULATOR

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Constant Field Values

MODE_IMMEDIATE

public static final int MODE_IMMEDIATE

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Constant Field Values

MODE_ZERO_PAGE

public static final int MODE_ZERO_PAGE

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Constant Field Values

MODE_ZERO_PAGE_X

public static final int MODE_ZERO_PAGE_X

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Constant Field Values

MODE_ZERO_PAGE_Y

public static final int MODE_ZERO_PAGE_Y

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Constant Field Values

MODE_ABSOLUTE

public static final int MODE_ABSOLUTE

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Constant Field Values

MODE_ABSOLUTE_X

public static final int MODE_ABSOLUTE_X

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Constant Field Values

MODE_ABSOLUTE_Y

public static final int MODE_ABSOLUTE_Y

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Constant Field Values

MODE_INDIRECT

public static final int MODE_INDIRECT

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Constant Field Values

MODE_INDIRECT_X

public static final int MODE_INDIRECT_X

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Constant Field Values

MODE_INDIRECT_Y

public static final int MODE_INDIRECT_Y

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Constant Field Values

MODE_RELATIVE

public static final int MODE_RELATIVE

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Constant Field Values

MODE_COUNT

public static final int MODE_COUNT

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Constant Field Values

name

public static final String[] name

The 6502 assembly name of the OpCode.

mode

public static final int[] mode

The mode in which each OpCode operates.

length

public static final int[] length

The length in bytes of each OpCode.

cycles

public static final int[] cycles

The base number of machine cycles each OpCode requires to complete. This does not take into account page boundry crossing or taking branches.

pb_cycles

public static final int[] pb_cycles

This is the Page Boundry Crossing Extra Cycle Count. This many cycles are added to the required cycle count if a page boundry is crossed.

bt_cycles

public static final int[] bt_cycles

This is the Branch Taken extra cycles count. This many cycles are added to the required cycle count if a branch is taken.

Constructor Detail

NesOpCodeTable

public NesOpCodeTable()

Method Detail

getSyntaxFormatted

public static String getSyntaxFormatted(int opCodeNum,
                                        int inByte1,
                                        int inByte2)

Produces a String containing the 6502 assembly language version of an OpCode and its parameters.

Parameters:

opCodeNum - The OpCode for which the 6502 assembly will be produced.

inByte1 - The first byte of parameter data or 0 if there is no first parameter.

inByte2 - The second byte of parameter data or 0 if there is no second parameter.

Returns:

The 6502 assembly formatted code.

getOpCodeBySyntax

public static int getOpCodeBySyntax(String baseOp,
                                    String params)

Returns the OpCode index value from a 6502 assembly statement based on the syntax of that statement.

Parameters:

baseOp - The OpCode nane.

params - The text of the params.

Returns:

The OpCode index value.

getParam

public static String getParam(String in)

Returns just the actual hex value portion of a paramater from the full 6502 formatted parameter String.

Parameters:

in - The String to analyze.

Returns:

The hex portion of the parameter string.