awful gross method got awfuller and grosser

eval.java

	/**
	 * Evaluates the command at the program counter.
	 */
	public void eval() {

		int currentInstruction = ram[counter.getModule()][counter.getIndex()];
		int tempA = 0x00000000;
		int tempB = 0x00000000;
		short address = 0x0000;

		switch (currentInstruction) {
		case 0x01: // STORE
			address = Byte.parseByte(Integer.toString(currentInstruction)
					.substring(3, 7));
			counter.increment();
			currentInstruction = ram[counter.getModule()][counter.getIndex()];
			writeToRAM(currentInstruction, parseHex(address));
			break;
		case 0x02: // ADD
			DataStack.push(DataStack.pop() + DataStack.pop());
			break;
		case 0x03: // SUBTRACT
			DataStack.push(DataStack.pop() - DataStack.pop());
			break;
		case 0x04: // RSTORE
			ReturnStack.push(DataStack.pop());
			break;
		case 0x05: // FETCH
			address = Byte.parseByte(Integer.toString(currentInstruction)
					.substring(3, 7));
			DataStack.push(readFromRAM(parseHex(address)));
			break;
		case 0x06: // AND
			DataStack.push(DataStack.pop() & DataStack.pop());
			break;
		case 0x07: // DROP
			DataStack.pop();
			break;
		case 0x08: // DUP
			DataStack.push(DataStack.pop());
			DataStack.push(DataStack.pop());
			break;
		case 0x09: // OR
			DataStack.push(DataStack.pop() ^ DataStack.pop());
			break;
		case 0x0A: // OVER
			break;
		case 0x0B: // RFETCH
			DataStack.push(ReturnStack.pop());
			break;
		case 0x0C: // SWAP
			tempA = DataStack.pop();
			tempB = DataStack.pop();
			DataStack.push(tempB);
			DataStack.push(tempA);
			break;
		}
	}