org.razvan.jzx.v128
Class IO

java.lang.Object
  org.razvan.jzx.BaseComponent
      org.razvan.jzx.BaseIO
          org.razvan.jzx.v128.IO

public class IO
extends BaseIO

The 128k model specialization of the BaseIO class.

Author:

Razvan Surdulescu (c) 2001 - 2006, Erik Kunze (c) 1995, 1996, 1997, Des Herriott (c) 1993, 1994
You may use and distribute this software for free provided you include this copyright notice. You may not sell this software, use my name for publicity reasons or modify the code without permission from me.

Field Summary

static int	B_BANK128 Bit mask for the 128k memory banks.
static int	B_PAGING Bit mask for enabling/disabling memory paging.
static int	B_SELRAM Bit mask for selecting the RAM page on C000-FFFF.
static int	B_SELROM Bit mask for selecting the ROM page.
static int	B_SELSCREEN Bit mask for selecting the Screen RAM page.
static int	B_SNDCHIP Sound chip mask (AY-3-8912 chip)
static int	B_SNDCONTROL Sound control mask (AY-3-8912 chip)
static int	B_SNDDATA Sound data mask (AY-3-8912 chip)
protected AY8912	m_ay8912 AY-3-8912 chip.
protected int	m_last0x7ffd Last value written to the memory bank port.
protected int	m_last0xfffd Last value written to the sound chip port.
protected int[]	m_psgPorts AY-3-8912 ports.
static int	P_128 Definition for all 128k ports.
static int	P_BANK128 Port address for 128k memory management.
static int	P_SNDCONTROL Sound control register (AY-3-8912 chip)
static int	P_SNDDATA Sound data register (AY-3-8912 chip)

Fields inherited from class org.razvan.jzx.BaseIO

B_BORDER, B_DOWN, B_EAR, B_FIRE, B_KEMPSTON, B_KEYBOARD, B_LEFT, B_MIC, B_RIGHT, B_SPEAKER, B_ULA, B_UP, LINE_BUF_SIZE, m_buffer, m_cpu, m_index, m_inPorts, m_keyPorts, m_lastBorderColor, m_memory, m_outPorts, m_screen, m_speakerLevel, P_KEMPSTON, P_SINCLAIR1, P_SINCLAIR2, P_ULA, SAMPLE_FREQ

Fields inherited from class org.razvan.jzx.BaseComponent

m_logger, m_spectrum

Constructor Summary

IO()

Method Summary

void	advance(int tStates)
int	in8(int port16) Read an 8-bit value from the specified 16-bit I/O port.
void	init(BaseSpectrum spectrum, ILogger logger) Allocate the AY port array and cache the reference to the AY-3-8912 chip.
void	load(BaseLoader loader) Load the saved values of 0x7ffd and 0xfffd oirt values.
void	out(int port16, int val8) Write an 8-bit value to the specified 16-bit I/O port.
void	reset() Set the AY port array to 0.
void	terminate() Set the port array to null and release the cached reference to the AY chip.

Methods inherited from class org.razvan.jzx.BaseIO

andIn, andKey, andOut, getAudioSamplesForTStates, mixSound, orIn, orKey, orOut

Methods inherited from class org.razvan.jzx.BaseComponent

getSpectrum

Methods inherited from class java.lang.Object

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

Field Detail

P_128

public static final int P_128

Definition for all 128k ports.

See Also:

Constant Field Values

P_BANK128

public static final int P_BANK128

Port address for 128k memory management.

See Also:

Constant Field Values

B_BANK128

public static final int B_BANK128

Bit mask for the 128k memory banks.

See Also:

Constant Field Values

B_SELRAM

public static final int B_SELRAM

Bit mask for selecting the RAM page on C000-FFFF.

See Also:

Constant Field Values

B_SELSCREEN

public static final int B_SELSCREEN

Bit mask for selecting the Screen RAM page.

See Also:

Constant Field Values

B_SELROM

public static final int B_SELROM

Bit mask for selecting the ROM page.

See Also:

Constant Field Values

B_PAGING

public static final int B_PAGING

Bit mask for enabling/disabling memory paging.

See Also:

Constant Field Values

P_SNDCONTROL

public static final int P_SNDCONTROL

Sound control register (AY-3-8912 chip)

See Also:

Constant Field Values

P_SNDDATA

public static final int P_SNDDATA

Sound data register (AY-3-8912 chip)

See Also:

Constant Field Values

B_SNDCHIP

public static final int B_SNDCHIP

Sound chip mask (AY-3-8912 chip)

See Also:

Constant Field Values

B_SNDCONTROL

public static final int B_SNDCONTROL

Sound control mask (AY-3-8912 chip)

See Also:

Constant Field Values

B_SNDDATA

public static final int B_SNDDATA

Sound data mask (AY-3-8912 chip)

See Also:

Constant Field Values

m_last0x7ffd

protected int m_last0x7ffd

Last value written to the memory bank port.

m_last0xfffd

protected int m_last0xfffd

Last value written to the sound chip port.

m_psgPorts

protected int[] m_psgPorts

AY-3-8912 ports.

m_ay8912

protected AY8912 m_ay8912

AY-3-8912 chip.

Constructor Detail

IO

public IO()

Method Detail

init

public void init(BaseSpectrum spectrum,
                 ILogger logger)

Allocate the AY port array and cache the reference to the AY-3-8912 chip.

Overrides:

init in class BaseIO

reset

public void reset()

Set the AY port array to 0.

Overrides:

reset in class BaseIO

terminate

public void terminate()

Set the port array to null and release the cached reference to the AY chip.

Overrides:

terminate in class BaseIO

in8

public int in8(int port16)

Read an 8-bit value from the specified 16-bit I/O port.

Overrides:

in8 in class BaseIO

Parameters:

port16 - The 16-bit I/O input port.

Returns:

The 8-bit value read from the I/O port.

out

public void out(int port16,
                int val8)

Write an 8-bit value to the specified 16-bit I/O port.

Overrides:

out in class BaseIO

Parameters:

port16 - The 16-bit I/O output port.

val8 - The 8-bit value to write to the I/O port.

advance

public void advance(int tStates)

Overrides:

advance in class BaseIO

load

public void load(BaseLoader loader)

Load the saved values of 0x7ffd and 0xfffd oirt values.

Overrides:

load in class BaseIO