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From: devoz@zurton.UUCP
Newsgroups: net.micro.apple
Subject: Re: Undocumented 6502 Opcodes
Message-ID: <9@zurton.UUCP>
Date: Wed, 27-Feb-85 03:38:46 EST
Article-I.D.: zurton.9
Posted: Wed Feb 27 03:38:46 1985
Date-Received: Sun, 3-Mar-85 05:33:03 EST
Lines: 31
Nf-ID: #R:aicchi:-37600:zurton:5800001:000:1021
Nf-From: zurton!devoz    Feb 24 13:05:00 1985




	I wouldn't put much stock in a HCF instruction, considering
	the VAST number of 6502 based machines.

	Think about it.  With the amount of "hacking" done on these,
	surely large numbers would have accidently executed HCF instructions
	and burst into flames.  (hee hee hee).

	I do support the theory that there may be an instruction, or
	types of instructions, 	that, when executed, causes a Degradation
	of the Instruction Set, killing off many instructions, and maiming
	others.

	If you program in 6502 you know exactly what I mean.

	A sample of Destructive Op Codes:

	DHXI		-  Destroy Half of the X Index register
	DHYI		-  Destroy Half of the Y Index register
	AWID		-  Always Wander Into Decimal mode

	There are more.  Supposedly during chip testing of the first
	few million devices, the original manufacturer wrongly executed
	these instructions, limiting the power of the 6502 forever,
	or until the 65816 arrives.  (Ahhhh, the price of compatibility).



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