Hi Paul!
>1) What is the difference between overflow and carry?
In short,
Carry is the 9th bit
Negativ is the 8th bit
Overflow is the 7th bit
You can do funny stuff with the Overflow.
Assuming you'd use the seventh Bit off foo as bolean
bitswitch, you could do:
BIT foo
BVS True
for example :-)
>2) What are some common situations where EOR is useful?
Hm... some standard VCS jobs for EOR:
- To flip a bitswitch
- To invert a certain bitpattern
- Generate Random numbers
- Invert the readings from the joystick port
- Generate screensaver colors
I'm using it quite often in Gunfight too. There's some
tricky EOR code for simplyfying the PF/Missile collision
detection in it for example...
Greetings,
Manuel
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