public void negSub(BCD10 b)
{
int c = 0;
bool wasNegative = isNegative();
for (int i = 0; i < DIGITS; i++)
{
int n = 20 - digits[i] - b.digits[i] - c;
c = 2 - n / 10;
digits[i] = (byte)(n % 10);
}
flagOVR = ((!wasNegative && !b.isNegative() && !isNegative()) ||
(wasNegative && b.isNegative() && isNegative()));
}
public void add(BCD10 b)
{
int c = 0;
bool wasNegative = isNegative();
for (int i = 0; i < DIGITS; i++)
{
int n = digits[i] + b.digits[i] + c;
c = n / 10;
digits[i] = (byte)(n % 10);
}
flagOVR = ((wasNegative && b.isNegative() && !isNegative()) ||
(!wasNegative && !b.isNegative() && isNegative()));
}
private void processOrder5()
{
BCD10 a = new BCD10();
if (accA == 0)
{
a.set(controlBoxScript.getKeyboard());
}
else
{
a.set(accumulators[accA]);
}
if (accB > 0)
{
effectiveOperand.add(accumulators[accB]);
}
switch (siriusOpcodeLow)
{
case 0: // DUMMY
break;
case 1:
if (a.msd() != 0)
{
setPC(effectiveOperand);
}
break;
case 2:
if (!a.isZero())
{
setPC(effectiveOperand);
}
break;
case 3:
if (flagOVR)
{
setPC(effectiveOperand);
}
flagOVR = false;
break;
case 4:
if (a.isNegative())
{
setPC(effectiveOperand);
}
break;
case 5:
setPC(effectiveOperand);
break;
case 6:
if (a.msd() == 0)
{
setPC(effectiveOperand);
}
break;
case 7:
if (a.isZero())
{
setPC(effectiveOperand);
}
break;
case 8:
if (!flagOVR)
{
setPC(effectiveOperand);
}
flagOVR = false;
break;
case 9:
if (!a.isNegative())
{
setPC(effectiveOperand);
}
break;
}
}