PCodeDsrRomBankedMemoryEntry.java

/*
  PCodeDsrRomBankedMemoryEntry.java

  (c) 2010-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.machine.ti99.dsr.pcode;

import v9t9.common.client.ISettingsHandler;
import v9t9.common.memory.IMemory;
import v9t9.common.memory.IMemoryEntry;
import v9t9.engine.hardware.ICruWriter;
import v9t9.engine.memory.GplMmio;
import v9t9.engine.memory.MultiBankedMemoryEntry;
import v9t9.machine.ti99.machine.TI99Machine;

/**
 * @author ejs
 *
 */
public class PCodeDsrRomBankedMemoryEntry extends MultiBankedMemoryEntry {

	private GplMmio pcodeGromMmio;

	public PCodeDsrRomBankedMemoryEntry() {
	}
	public PCodeDsrRomBankedMemoryEntry(ISettingsHandler settings, IMemory memory, String name,
			IMemoryEntry[] banks) {
		super(settings, memory, name, banks);
	}
	
	public void setup(TI99Machine machine, GplMmio pcodeGromMmio) {
		this.pcodeGromMmio = pcodeGromMmio;
		
		// bit 0 (0x1f00) handled as DSR
		machine.getCruManager().removeWriter(0x1f80, 1);
		machine.getCruManager().removeWriter(0x1f86, 1);
		
		machine.getCruManager().add(0x1f80, 1, 
				new ICruWriter() {

					@Override
					public int write(int addr, int data, int num) {
						selectBank(data & 1);
						return 0;
					}
			
		});
		
		machine.getCruManager().add(0x1f86, 1, 
				new ICruWriter() {

					@Override
					public int write(int addr, int data, int num) {
						// blink light
						System.out.println("*** PCODE blink " + (data == 0 ? "off" : "on"));
						return 0;
					}
			
		});
	}

	/* (non-Javadoc)
	 * @see v9t9.engine.memory.MemoryEntry#readByte(int)
	 */
	@Override
	public byte readByte(int addr) {
		if (addr >= 0x5bfc && addr <= 0x5bff) {
			return pcodeGromMmio.read(addr);
		}
		return super.readByte(addr);
	}

	@Override
	public void writeByte(int addr, byte val) {
		if (addr >= 0x5ffc && addr <= 0x5fff) {
			pcodeGromMmio.write(addr, val);
			return;
		}
		super.writeByte(addr, val);
	}

	/* (non-Javadoc)
	 * @see v9t9.engine.memory.BankedMemoryEntry#reset()
	 */
	@Override
	public void reset() {
		super.reset();
		pcodeGromMmio.reset();
	}
}