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From: jeff@gatech.CSNET (Jeff Lee)
Newsgroups: net.arch
Subject: Re: Re**n: RISC (really on multiplication d
Message-ID: <671@gatech.CSNET>
Date: Fri, 26-Jul-85 13:24:16 EDT
Article-I.D.: gatech.671
Posted: Fri Jul 26 13:24:16 1985
Date-Received: Sat, 27-Jul-85 00:39:20 EDT
References: <149@mips.UUCP> <600005@pbear.UUCP> <493@mmintl.UUCP> <298@ttrdc.UUCP>
Organization: School of Information and Computer Science, Georgia Tech, Atlanta
Lines: 20

>>> The Decsystem-10 & 20 has an instruction IMUL which does exactly what you
>>> want. It Multiplies a 36bit value by another 36 bit value and gives a 36
>>> bit result. They also have a divide which divides a 36 bit number.
>>
>>For comparison and elucidation, so do:
>>
>>            ...
>>	Motorola 68000, 68020, 6800, 6809, ...
>>			       ^^^^
>>            ...
> 
> Since when did Motorola add such fancy hardware to their lowly 6800?

I remember the 6801 having an 8x8 bit multiply but it put the result in
the D register (A and B used as a double length register), giving a 16-bit
result.
-- 
Jeff Lee
CSNet:	Jeff @ GATech		ARPA:	Jeff%GATech.CSNet @ CSNet-Relay.ARPA
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