de.michab.simulator.mos6502
Class Cia

java.lang.Object
  de.michab.simulator.DefaultChip
      de.michab.simulator.mos6502.Cia

All Implemented Interfaces:

Addressable, Chip

public final class Cia

extends DefaultChip

Represents an instance of the 64's 6526 Complex Input/output Adapter. Represents a facade to the classes implementing the functional components of the chip and is responsible for dispatching the values written into or read from this chip's registers.

Version:

$Revision: 1.19 $

Author:

Michael G. Binz

Constructor Summary

Cia(Cpu6510 cpu, Clock clock)
Creates a CIA.

Method Summary

void	connectPortA(Forwarder listener) Connects IO port A to a bus that is written on each internal write operation on that port.
void	connectPortB(Forwarder listener) Connects IO port B to a bus that is written on each internal write operation on that port.
Forwarder	getInputPortA() Get a writeable reference to port A.
Forwarder	getInputPortB() Get a writeable reference to port B.
Port[]	getPorts() Get an array of the chip's ports.
byte	read(int portId) The central read entry.
void	reset() Resets the Chip.
void	write(int portId, byte value) This is the common write entry.

Methods inherited from class de.michab.simulator.DefaultChip

createPorts

Methods inherited from class java.lang.Object

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

Constructor Detail

Cia

public Cia(Cpu6510 cpu,
           Clock clock)

Creates a CIA. The passed CPU reference is used for interrupt purposes.

Parameters:

cpu - The CPU receiving the interrupts.

Method Detail

connectPortA

public void connectPortA(Forwarder listener)

Connects IO port A to a bus that is written on each internal write operation on that port. Only output lines are written.

connectPortB

public void connectPortB(Forwarder listener)

Connects IO port B to a bus that is written on each internal write operation on that port. Only output lines are written.

getInputPortA

public Forwarder getInputPortA()

Get a writeable reference to port A. The returned forwarder can be connected to bus systems.

getInputPortB

public Forwarder getInputPortB()

Get a writeable reference to port B. The returned forwarder can be connected to bus systems.

read

public byte read(int portId)

The central read entry. Called on each write to one of the internal registers (Ports).

Parameters:

portId - The source address.

Returns:

The byte read.

write

public void write(int portId,
                  byte value)

This is the common write entry.

Parameters:

portId - The port to write.

value - The value to write.

getPorts

public Port[] getPorts()

Description copied from interface: Chip

Get an array of the chip's ports. May return null if this chip does not support ports.

Returns:

An array of the chip's ports.

reset

public void reset()

Resets the Chip.