ConsoleMmioReadArea.java

/*
  ConsoleMmioReadArea.java

  (c) 2008-2013 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.memory.mmio;

import v9t9.common.memory.IMemoryEntry;
import v9t9.engine.memory.IConsoleMmioReader;

public class ConsoleMmioReadArea extends ConsoleMmioArea {
    protected final IConsoleMmioReader reader;

	public ConsoleMmioReadArea(IConsoleMmioReader reader, int latency, int oddLatency) {
		super(latency, oddLatency);
        this.reader = reader;
		if (reader == null) {
			throw new NullPointerException();
		}
    }
	
	public ConsoleMmioReadArea(IConsoleMmioReader reader, int latency) {
		this(reader, latency, latency);
	}
	
	@Override
	public byte readByte(IMemoryEntry entry, int addr) {
		if (0 == (addr & 1))
			return reader.read(addr);
		return 0;
	}
	
	@Override
	public short readWord(IMemoryEntry entry, int addr) {
		return reader.read(addr);
	}
	
	@Override
	public byte flatReadByte(IMemoryEntry entry, int addr) {
		return 0;
	}
	
	@Override
	public short flatReadWord(IMemoryEntry entry, int addr) {
		return 0;
	}
	
	@Override
	public void flatWriteByte(IMemoryEntry entry, int addr, byte val) {
	}
	
	@Override
	public void flatWriteWord(IMemoryEntry entry, int addr, short val) {
	}
}