Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!wuarchive!gem.mps.ohio-state.edu!apple!baum
From: baum@Apple.COM (Allen J. Baum)
Newsgroups: comp.arch
Subject: Re: Self-modifying code
Message-ID: <35636@apple.Apple.COM>
Date: 14 Oct 89 01:16:44 GMT
References: <4534@imagen.UUCP>
Reply-To: baum@apple.UUCP (Allen Baum)
Organization: Apple Computer, Inc.
Lines: 18

[]
>In article <4534@imagen.UUCP> hedley@imagen.UUCP (Hedley Rainnie) writes:
>
>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.

Except on the newer DEC-20s, it ran slower out of the register file than 
out of real memory. oops.



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