Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site utai.UUCP Path: utzoo!utcsri!utai!dudek From: dudek@utai.UUCP (Gregory Dudek) Newsgroups: net.micro.apple Subject: Re: Undocumented 6502 Opcodes Message-ID: <381@utai.UUCP> Date: Mon, 4-Mar-85 13:30:12 EST Article-I.D.: utai.381 Posted: Mon Mar 4 13:30:12 1985 Date-Received: Mon, 4-Mar-85 14:43:13 EST References: <9@zurton.UUCP> Reply-To: dudek@utai.UUCP (Gregory Dudek) Organization: CSRI, University of Toronto Lines: 9 Summary: I tried to execute some of the unused 6502 opcodes and found one that seems to conform to the described HCF specs. That is, the processor seems to hang up and doesn't go anywhere until it gets a reset. Of course, I didn't let it sit there long enough to find out if the processor would self-destruct. If anybody is willing to satisfy our curiosities, the op-code was $12. As noted, the presence of the HCF instruction may depend on the chip manufacturer. Unfortunately, I forgot to check who made mine. Greg Dudek