dioscuri.module.memory
Class Memory

java.lang.Object
  dioscuri.module.AbstractModule
      dioscuri.module.ModuleMemory
          dioscuri.module.memory.Memory

All Implemented Interfaces:

Module

public class Memory
extends ModuleMemory

An implementation of a hardware memory module.

Contains an array of 2^20 integers, offering 1MB of RAM.

See Also:

Metadata module ******************************************** general.type : memory general.name : 1 Megabyte Random Access Memory general.architecture : Von Neumann general.description : General implementation of 1 MB of flat RAM. general.creator : Tessella Support Services, Koninklijke Bibliotheek, Nationaal Archief of the Netherlands general.version : 1.0 general.keywords : memory, RAM, 1MB, A20 address line general.relations : cpu, mainboard general.yearOfIntroduction : general.yearOfEnding : general.ancestor : general.successor : memory.size : 1 MB

Notes: none

Nested Class Summary

Nested classes/interfaces inherited from interface dioscuri.interfaces.Module

Module.Type

Field Summary

protected static long	A20mask
byte[]	ram

Fields inherited from class dioscuri.module.AbstractModule

type

Constructor Summary

Memory(Emulator owner)
Class constructor

Method Summary

byte	getByte(int address) Return a byte from memory at a specific address
java.lang.String	getDump() Return a dump of module status
byte[]	getWord(int address) Returns the value of a word at a specific address Note: words in memory are stored in Little Endian order (LSB, MSB), but this method returns a word in Big Endian order (MSB, LSB) because this is the common way words are used by instructions.
boolean	reset() Reset all parameters of module.
void	setA20AddressLine(boolean status) Set A20 address line toggle
void	setByte(int address, byte value) Set a byte in memory at given address
void	setBytes(int address, byte[] binaryStream) Stores an array of bytes in memory starting at a specific address
void	setRamSizeInMB(int ramSizeMB) Set RAM Size in megabytes
void	setWatchValueAndAddress(boolean isWatchOn, int watchAddress) Set watch toggle and address to trace in memory
void	setWord(int address, byte[] value) Stores the value of a word at a specific address Note: words in memory are stored in Little Endian order (LSB, MSB), but this method assumes that a word is given in Big Endian order (MSB, LSB) because this is the common way words are used by instructions.

Methods inherited from class dioscuri.module.AbstractModule

getConnection, getConnections, getDebugMode, getExpectedConnections, getType, isConnected, setConnection, setDebugMode, start, stop

Methods inherited from class java.lang.Object

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

Field Detail

ram

public byte[] ram

A20mask

protected static long A20mask

Constructor Detail

Memory

public Memory(Emulator owner)

Class constructor

Parameters:

owner -

Method Detail

reset

public boolean reset()

Reset all parameters of module.

Specified by:

reset in interface Module

Specified by:

reset in class AbstractModule

Returns:

true iff the AbstractModule was reset properly.

See Also:

AbstractModule

getDump

public java.lang.String getDump()

Return a dump of module status

Provides a dummy implementation since many of the subclasses of this abstract module class do not need or use a getDump() implementation. The ones that do, can override this method.

Specified by:

getDump in interface Module

Overrides:

getDump in class AbstractModule

Returns:

string containing a dump of this module

See Also:

AbstractModule

getByte

public byte getByte(int address)

Return a byte from memory at a specific address

Specified by:

getByte in class ModuleMemory

Parameters:

address - Flat-address where data can be found

Returns:

the byte at the given address

See Also:

ModuleMemory

setByte

public void setByte(int address,
                    byte value)

Set a byte in memory at given address

Specified by:

setByte in class ModuleMemory

See Also:

ModuleMemory

getWord

public byte[] getWord(int address)

Returns the value of a word at a specific address Note: words in memory are stored in Little Endian order (LSB, MSB), but this method returns a word in Big Endian order (MSB, LSB) because this is the common way words are used by instructions.

Specified by:

getWord in class ModuleMemory

Parameters:

address - Flat-address where data can be found

Returns:

byte[] array [MSB, LSB] containing data, 0xFFFF if address outside RAM_SIZE range

See Also:

ModuleMemory

setWord

public void setWord(int address,
                    byte[] value)

Stores the value of a word at a specific address Note: words in memory are stored in Little Endian order (LSB, MSB), but this method assumes that a word is given in Big Endian order (MSB, LSB) because this is the common way words are used by instructions. However, storage takes place in Little Endian order.

Specified by:

setWord in class ModuleMemory

See Also:

ModuleMemory

setBytes

public void setBytes(int address,
                     byte[] binaryStream)
              throws ModuleException

Stores an array of bytes in memory starting at a specific address

Specified by:

setBytes in class ModuleMemory

Parameters:

address - Flat-address where data is stored

Throws:

ModuleException

See Also:

ModuleMemory

setA20AddressLine

public void setA20AddressLine(boolean status)

Set A20 address line toggle

Specified by:

setA20AddressLine in class ModuleMemory

See Also:

ModuleMemory

setWatchValueAndAddress

public void setWatchValueAndAddress(boolean isWatchOn,
                                    int watchAddress)

Set watch toggle and address to trace in memory

Specified by:

setWatchValueAndAddress in class ModuleMemory

See Also:

ModuleMemory

setRamSizeInMB

public void setRamSizeInMB(int ramSizeMB)

Set RAM Size in megabytes

Specified by:

setRamSizeInMB in class ModuleMemory

See Also:

ModuleMemory