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From: gnu@sun.uucp (John Gilmore)
Newsgroups: net.arch
Subject: Re: IBM 1130 mini had regs in memory too
Message-ID: <380@sun.uucp>
Date: Fri, 9-Dec-83 20:45:28 EST
Article-I.D.: sun.380
Posted: Fri Dec  9 20:45:28 1983
Date-Received: Tue, 13-Dec-83 01:18:34 EST
References: <4301@umcp-cs.UUCP>
Organization: Sun Microsystems, Inc.
Lines: 8

It had a "real" accumulator and multiplier/quotient register, but
the "index registers" were in core locations 1, 2, and 3 (this was in
the days of real "core" core, too, with 3.6us cycle times).  Its sister
machine, the 1800 process-control computer, had the registers in real
registers, so if you wanted your code to be portable you couldn't
take advantage.  Not that there was any advantage anyway...