/*
* - 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));
}
}
/*
* - 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));
}
}
/*
* - STA $m Store the accumulator to a memory location
*/
private static void STA(CPU cpu, short operand)
{
int acc = (int)(cpu.getRegisterValue(2)); //Get accumulator value
cpu.getMemory().setMemoryLocation(operand, acc);
}
/*
* - HLT Quit the program (not needed if the last line of the program is the end)
*/
private static void HLT(CPU cpu)
{
cpu.setPC((short)(cpu.getMemory().getInstructionCount()+1));
}
