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From: mark@aoa.UUCP (Mark Reynolds)
Newsgroups: comp.arch
Subject: Re: QM-1 or like machines???
Message-ID: <397@aoa.UUCP>
Date: Thu, 27-Aug-87 09:43:55 EDT
Article-I.D.: aoa.397
Posted: Thu Aug 27 09:43:55 1987
Date-Received: Sat, 29-Aug-87 09:14:12 EDT
References: <63900006@convex> <1118@pdn.UUCP>
Reply-To: mark@aoa.UUCP (Mark Reynolds)
Organization: Adaptive Optics Assoc., Cambridge, Mass. USA
Lines: 18
Keywords: microcode
Summary: M680x0 writeable control store?


In article <1118@pdn.UUCP> alan@pdn.UUCP (0000-Alan Lovejoy) writes:
>   
>The M680x0 family has a nanocode/microcode architecture, and has been
>used to emulate other architectures.  IBM's XT/370 and AT/370 used
>remicrocoded M680x0's to emulate S370.
>

I've heard persistent rumors that it is possible to remicrocode some of/
one of the M680x0 series without ripping the chip apart, i.e. that some 
have a writeable microcode control store.  I have never believed this
( and still don't ), but this article has prompted me to raise this
rumor, and see if it gets any response.  Comments on this ( outlandish )
concept, anyone?

	Mark Reynolds
	...!{wjh12,mit-vax}!biomed!aoa!mark
	...!{harvard,ima}!bbn!aoa!mark