From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave Eckhardt <davide+p9@cs.cmu.edu>
To: 9fans@9fans.net
In-Reply-To: <18f3fced1ebb90eb9c977b47bbcce424@vitanuova.com>
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Content-ID: <7275.1254874793.1@lunacy.ugrad.cs.cmu.edu>
Date: Tue,  6 Oct 2009 20:19:53 -0400
Message-ID: <7276.1254874793@lunacy.ugrad.cs.cmu.edu>
Subject: Re: [9fans] /sys/include/ip.h 5c(1)
Topicbox-Message-UUID: 82a4718e-ead5-11e9-9d60-3106f5b1d025

> i thought several universities did modify the microcode in
> various ways, to test some research ideas, or just to improve
> things.

As I understand it, on the 750 floating-point errors were
accidentally traps instead of faults, or the other way
around.  DEC said "oops, well, we guess it's model-dependent
whether floating-point errors are traps or faults".  The BSD
guys patched the microcode.

For something "nobody would want to do", there sure are a
lot of hits for "pcs750.bin".

Dave Eckhardt