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Path: utzoo!watmath!watrose!cdshaw
From: cdshaw@watrose.UUCP (Chris Shaw)
Newsgroups: net.micro.apple
Subject: Re: Undocumented 6502 Opcodes
Message-ID: <7307@watrose.UUCP>
Date: Sun, 24-Feb-85 06:15:30 EST
Article-I.D.: watrose.7307
Posted: Sun Feb 24 06:15:30 1985
Date-Received: Wed, 27-Feb-85 03:06:04 EST
References: <376@aicchi.UUCP> <74@cvl.UUCP>
Reply-To: cdshaw@watrose.UUCP (Chris Shaw)
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 11


The HCF instruction actually did exist in the early version of the Motorola
6800. This "instruction" was undocumented, as well, but I read an article
in an ancient BYTE (1978 or so) that documented the undocumented goodies
of 6800, and this was one of the instructions.

It doesn't strike me as too likely that HCF could have occurred on 2 
processors, and given reputations of all the CPU makers around I would vote
Motorola as being most likely to screw up like this.

Chris Shaw