Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!uw-beaver!tikal!warren
From: warren@tikal.Teltone.COM (Warren Seltzer)
Newsgroups: comp.arch
Subject: Re: ZISC computers
Keywords: ZISC
Message-ID: <1065@tikal.Teltone.COM>
Date: 30 Nov 88 20:52:38 GMT
References: <22115@sgi.SGI.COM>
Reply-To: warren@tikal.UUCP (Warren Seltzer)
Organization: Teltone Corp., Kirkland, WA
Lines: 20


 In the early seventies, the Burroughs 1700-series computers used this
 scheme for the *MICROCODE*.  That is, the hardware was pretty much as you
 described, using registers instead of "memory", although there were other
 opcodes.  The only code written in this machine language was microcode,
 diagnostic code, and research systems.

 As I remember, there was an "X" register, a "Y" register, and an "X+Y"
 register, from whence the sum was read, an "X * Y" register, an "X/Y"
 register, and so on.

 By the way, this was a very interesting machine in other ways as well.

 Warren

-- 
(206) 827-9626                          Warren Seltzer
...uw-beaver_____!tikal!warren          Teltone Corporation
.......fluke___/                        P.O. Box 657 
...microsoft__/                         Kirkland, WA  98033