Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site teldata.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!houxz!vax135!cornell!uw-beaver!teltone!teldata!tac
From: tac@teldata.UUCP ()
Newsgroups: net.micro.apple
Subject: Re: garbage in garbage out
Message-ID: <416@teldata.UUCP>
Date: Fri, 6-Jul-84 10:29:07 EDT
Article-I.D.: teldata.416
Posted: Fri Jul  6 10:29:07 1984
Date-Received: Sat, 7-Jul-84 02:24:49 EDT
References: <367@ames-lm.UUCP>, <515@spuxll.UUCP>
Organization: Teltone Corp., Kirkland, WA
Lines: 24

, (sop to the blank line eaters--consider it a religious sacrifice)

>>  From: ech@spuxll.UUCP (Ned Horvath)
>>  
>>  These lists of strange op codes resurface from time to time; how about a
>>  bit of trivia for you older hackers: the 1401 had a "Halt and Branch"
>>  instruction - and it was actually USEFUL.  Anybody want to try to explain
>>  this one?
>>  
>>  =Ned=

If my "core" serves me correctly, this instruction would halt until a certain
event happened and then recommence processing.  Thus it could be used as an
interrupt without branching.

	    From the (Age Old) Soapbox of
	    Tom Condon     {...!uw-beaver!teltone!teldata!tac}

	    A Bug A Day Keeps Unemployment Away.

DISCLAIMER:  The opinions expressed herein are those of everyone who
  matters, but not necessarily anyone you know, and most certainly not
  my employers!