Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!convex!texsun!newstop!sun!imagen!hedley
From: hedley@imagen.UUCP (Hedley Rainnie)
Newsgroups: comp.arch
Subject: Re: Self-modifying code
Keywords: KL10 Dec-10,20
Message-ID: <4534@imagen.UUCP>
Date: 13 Oct 89 22:08:00 GMT
Organization: Imagen Corp., Santa Clara CA
Lines: 17


Mention has been made of the Dec-10 and 20. These machines also had the
feature that the registers were part of the address space, a very rare
feature indeed these days, this allows one to code a string search algorithm
and have the code reside in addresses 0..17 (octal of course), and then to
jump into the registers via an XCT instruction, the pleasure of this is that
the code will run at register speeds. Nowadays the cache technology is such 
that this kind of coding is no longer needed but a little nostalgia is a 
good thing.

Hedley

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