Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site spuxll.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!zehntel!dual!amd!decwrl!decvax!harpo!whuxle!spuxll!ech From: ech@spuxll.UUCP (Ned Horvath) Newsgroups: net.micro.apple Subject: Re: halt and branch Message-ID: <540@spuxll.UUCP> Date: Wed, 25-Jul-84 13:19:07 EDT Article-I.D.: spuxll.540 Posted: Wed Jul 25 13:19:07 1984 Date-Received: Sun, 29-Jul-84 00:08:13 EDT References: <416@teldata.UUCP> Organization: AT&T Information Systems, South Plainfield NJ Lines: 8 The actual use of the halt-and-branch is due to the fact that there were two start buttons on the 1401: a simple resume and a reset-resume. Neither cleared the program counter, but the reset-start would clear the (suspended) branch (thereby continuing after the halt without taking the branch). Thus the operator could transmit one bit to the program by his choice of start button (no console, remember!). =Ned=