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From: gnu@sun.uucp (John Gilmore)
Newsgroups: net.lang.c,net.micro.68k
Subject: Re: Freezing 68020 Cache
Message-ID: <1704@sun.uucp>
Date: Tue, 25-Sep-84 00:55:35 EDT
Article-I.D.: sun.1704
Posted: Tue Sep 25 00:55:35 1984
Date-Received: Sat, 29-Sep-84 08:52:30 EDT
References: <3@tikal.UUCP>, <8836@watmath.UUCP>, <235@callan.UUCP> <424@watdcsu.UUCP> <139@rlgvax.UUCP>
Organization: Sun Microsystems, Inc.
Lines: 11

Actually I had assumed that the passage about "emulator functions"
was talking about other-machine emulators.  I once wrote the basic structure
of a program that would emulate the IBM 370 on a 68000 -- the slowdown
was about 20:1 (i.e. it took 20 68000 instructions to fetch, decode, and
execute the average 370 instruction).  If you could freeze the inner loop
of this into the 68020 cache you might get a much better performance ratio.

Kinda like 1401 emulator mode on 370's, those dinosaurs just won't die.

If anybody wants a copy of the 3-page very rough paper on the 370 emulator,
send me mail.