Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ptsfa!pacbell!att-ih!ihnp4!inuxc!iuvax!pur-ee!uiucdcs!uxc.cso.uiuc.edu!uxe.cso.uiuc.edu!mcdonald
From: mcdonald@uxe.cso.uiuc.edu
Newsgroups: comp.arch
Subject: Re: RISC is a nasty no-no!
Message-ID: <46500009@uxe.cso.uiuc.edu>
Date: 2 Mar 88 02:29:00 GMT
References: <179@wsccs.UUCP>
Lines: 22
Nf-ID: #R:wsccs.UUCP:179:uxe.cso.uiuc.edu:46500009:000:708
Nf-From: uxe.cso.uiuc.edu!mcdonald    Mar  1 20:29:00 1988



>Anyone remember the CADET? It was, I believe, the IBM 1630 and stood for
>'Can't Add, Doesn't Even Try'. It did its addition by table lookup.

IBM 1620

It also used table lookup for multiplies.

The table was at a fixed location in memory (100, I seem to 
remember) and had to be read in at boot time be the card reader.

This machine used 2N404 GERMANIUM!!! transistors.

It normally ran at 125kHZ, but it had a special circuit so that when the
(hardware) instruction to write to its typewriter occured the clock
slowed down to 10 Hz - driven by a cam on the motor shaft!!!!!!!!!!!

It was fully, absolutely, DECIMAL.

It was variable "word" length, up to 20000 decimal digits!!!!!!!!!

Doug McDonald