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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