/// <summary>
/// Reads from Port A
/// </summary>
/// <returns></returns>
private int INPortA()
{
if (DirPortA == PortDirection.Input)
{
// read from PSG
return(PSG.PortRead());
}
else
{
// Port A is set to output
// return latched value
return(Regs[PORT_A]);
}
}