Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/5/84; site sjuvax.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!allegra!sjuvax!jss
From: jss@sjuvax.UUCP (J. Shapiro)
Newsgroups: net.arch
Subject: Re: Re: Re: RISC (really on multiplication d
Message-ID: <1202@sjuvax.UUCP>
Date: Mon, 22-Jul-85 00:24:21 EDT
Article-I.D.: sjuvax.1202
Posted: Mon Jul 22 00:24:21 1985
Date-Received: Thu, 25-Jul-85 03:15:10 EDT
References: <149@mips.UUCP> <600005@pbear.UUCP> <493@mmintl.UUCP> <233@weitek.UUCP>
Organization: Haverford College, Haverford, Pa.
Lines: 24

> > ... one multiplies two words and wants a word result.
> > But hardware multiplies invariably generate a two word result, leaving the
> > high-order word to be allowed for and/or disposed of.
> 
> 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:

	VAX
	PDP-11
	National 32016 and family
	Motorola 68000, 68020, 6800, 6809, ...
	Zilog Z8000
	Z80
	Intel 8086, 80186, 82086

-----

Bell Laboratories is an Artificial Inteligence project of the UNIX (tm)
operating system... (borrowed from an unknown wit)

Jon Shapiro