Re: DECSYSTEM 20

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Article #1646

#1646

From: Roy Smith
Date: Tue, 25 Jul 1989 02:51

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In <BRUCE.89Jul23155646@heather.pooh.com> bruce@heather.pooh.com
(Bruce Robertson) writes:
> I like the way the PDP-11 treats the program counter as a general
> register.  You can play a lot of tricks with that!

	I always wanted to try (I don't know why I never did) using
auto-decrement mode on r7 (i.e. the pc).  I wonder what would happen?  A
tight 1-instruction infinite loop?  Akin, but not as bad as, the famous GD
Nova and DEC-10 infinite-indirection loops, I guess.
-- 
Roy Smith, Public Health Research Institute
455 First Avenue, New York, NY 10016
{att,philabs,cmcl2,rutgers,hombre}!phri!roy -or- roy@alanine.phri.nyu.edu
"The connector is the network"

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cmcl2!phri!roy
From: roy@phri.UUCP (Roy Smith)
Newsgroups: comp.arch
Subject: Re: DECSYSTEM 20
Summary: Really about pdp-11 pc as gp reg
Message-ID: <3893@phri.UUCP>
Date: 25 Jul 89 02:51:21 GMT
References: <3256@wpi.wpi.edu> <EGDORF.89Jul21195924@zaphod.lanl.gov> <443@anasaz.UUCP> <BRUCE.89Jul23155646@heather.pooh.com>
Reply-To: roy@phri.UUCP (Roy Smith)
Organization: Public Health Research Inst. (NY, NY)
Lines: 14

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