MultiSoundTMS9919.java

/*
  MultiSoundTMS9919.java

  (c) 2009-2013 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.engine.sound;


import v9t9.common.hardware.ISoundChip;
import v9t9.common.machine.IMachine;
import v9t9.common.sound.MultiSoundTMS9919Consts;

/**
 * Multiple packed TMS9919 chips.  This provides a TMS9919 at any number
 * of addresses.  It is based on the description of the FORTI sound chips at
 * <http://nouspikel.group.shef.ac.uk//ti99/forti.htm>
 * @author ejs
 *
 */
public class MultiSoundTMS9919 extends BaseMultiSound {
	public MultiSoundTMS9919(IMachine machine) {
		super(machine);
	}

	/* (non-Javadoc)
	 * @see v9t9.engine.sound.BaseMultiSound#doGenerateChips()
	 */
	@Override
	protected void doGenerateChips() {
		// 	5 chips: the original TMS9919 on the console and 4 extra on the card

		this.chips = new SoundTMS9919[5];
		int regBase = 0;
		for (int i = 0; i < chips.length; i++) {
			chips[i] = new SoundTMS9919(machine, "S" + i, "Chip #" + i, regBase);
			regBase = registerChip(chips[i], regBase);
		}
		
		regCount = regBase;		
	}
	

	public void writeSound(int addr, byte val) {
		if ((addr & 0xff) < 0xC0) {
			int mask = addr & 0x1e;

			if (mask == 0) {
				chips[0].writeSound(addr, val);
			} else {
				int chip = 1;
				// the low 4 bits of the word address tell (NAND-wise)
				// which chip to target
				for (int bit = 2; bit <= 0x10; bit += bit) {
					if ((mask & bit) == 0 && chip < chips.length) {
						chips[chip].writeSound(addr, val);
					}
					chip++;
				}
			}
		}
	}
	
	public void setAudioGate(int addr, boolean b) {
		chips[0].setAudioGate(addr, b);
	}

//	public void setCassette(int addr, boolean b) {
//		chips[0].setCassette(addr, b);
//	}
	
//	/* (non-Javadoc)
//	 * @see v9t9.common.hardware.ISoundChip#getCassetteVoice()
//	 */
//	@Override
//	public ICassetteVoice getCassetteVoice() {
//		return chips[0].getCassetteVoice();
//	}

	/* (non-Javadoc)
	 * @see v9t9.common.machine.IRegisterAccess#getGroupName()
	 */
	@Override
	public String getGroupName() {
		return MultiSoundTMS9919Consts.GROUP_NAME;
	}
	
	/* (non-Javadoc)
	 * @see v9t9.common.hardware.ISoundChip#reset()
	 */
	@Override
	public void reset() {
		for (ISoundChip chip : chips) {
			chip.reset();
		}
	}
}