From: Pete Turnbull: Wednesday, September 14, 2016 7:20 AM > ISZ ovfsum / if yes, 3777 -> 4000 (MIN INT) > CLA / really a NOP You should be able to remove the CLA, as that ISZ won't skip and the AC is already clear. Yours is definitely better, I think, as the XOR business didn't help the readability either. Vince