Search found 2 matches

by mikro
Thu Jan 11, 2018 9:12 am
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 36
Views: 20930

Re: Undefined behavior for ABCD and SBCD

Thanks for confirming that even the non-Sega emulators also got the BCD instructions wrong :-) (even if only slightly) By the way, BlastEm (and I think GPGX) now emulate these instructions correctly. Not anymore . :) Thanks to your code I was able to spot the slight error in WinUAE, then the change...
by mikro
Tue Jan 09, 2018 12:52 am
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 36
Views: 20930

Re: Undefined behavior for ABCD and SBCD

Hi there, a newcomer and non-Sega guy here. :) I found this super interesting thread, thanks for all the published code. It will help me a lot. However: So, I decided to conduct my own investigation into this issue, and did some HW tests, patent investigation, and number crunching; and after doing a...