Delete comment from: Ken Shirriff's blog
Ken Shirriff said...
Paulo: SBC takes the ones complement and adds the carry. If the carry is 1, this is the same as the twos complement. If the carry is 0, this is the same as twos complement with borrow. The tricky part here is the carry is used as an inverted borrow flag.
Bayle: you're right; that's a typo.
Sep 21, 2016, 11:01:23 AM