/*
* - ADD $m Add the value in memory to the accumulator
* - ADD #$val Add the value to the accumulator
*/
private static void ADD(CPU cpu, Boolean immediate, short operand)
{
short acc = cpu.getRegisterValue(2);
if (immediate)
{
cpu.setRegisterValue(2, (short)(acc + operand));
}
else
{
short value = (short)cpu.getMemory().getMemoryLocation(operand);
cpu.setRegisterValue(2, (short)(acc + value));
}
}
/*
* - SHL #$val Shift the accumulator by the number of bits to the left
*/
private static void SHL(CPU cpu, short operand)
{
short acc = cpu.getRegisterValue(2);
cpu.setRegisterValue(2, (short)(acc << operand));
}
/*
* - NOTA Logical "not" of accumulator
*/
private static void NOTA(CPU cpu)
{
short acc = cpu.getRegisterValue(2);
cpu.setRegisterValue(2, (short)~cpu.getRegisterValue(2));
}
/*
* - LDA #$val Sets the accumulator with the value
* - LDA $m Sets the accumulator from a memory location
*/
private static void LDA(CPU cpu, Boolean immediate, short operand)
{
if (immediate)
{
cpu.setRegisterValue(2, operand);
}
else
{
cpu.setRegisterValue(2, (short)cpu.getMemory().getMemoryLocation(operand));
}
}
/*
* - BL lbl Branch to label if operation resulted in Negative
*/
private static void BL(CPU cpu, short operand)
{
short acc = cpu.getRegisterValue(2);
if (acc < 0)
{
cpu.setRegisterValue(5, operand);
}
}
/*
* - BA lbl Always branch to label (goto)
*/
private static void BA(CPU cpu, short operand)
{
cpu.setRegisterValue(5, operand);
}
