Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site sdcsvax.UUCP Path: utzoo!watmath!clyde!akgua!sdcsvax!jc From: jc@sdcsvax.UUCP (John Cornelius) Newsgroups: net.arch Subject: Re: Global memory usage in the 1401 Message-ID: <145@sdcsvax.UUCP> Date: Fri, 28-Sep-84 21:16:35 EDT Article-I.D.: sdcsvax.145 Posted: Fri Sep 28 21:16:35 1984 Date-Received: Sun, 30-Sep-84 00:53:20 EDT References: <1689@sun.uucp>, <1373@vax2.fluke.UUCP> Organization: EECS Dept. U.C. San Diego Lines: 15 Any body remember the Hexagecimal adder? Consider the problem of subtracting two decimal numbers represented as strings of quasi-ebcdic characters, one digit at a time. Of course there was always the wordmark which was and extra bit that delineated the end of a 'thing'. As I recall the 1401 memory had bits ABC8421W where 8421 encoded the digit, AB encoded the field punches on cards, C was the parity bit and W was the word mark. Can you believe that this is the machine that brought us into the computer age? John Cornelius Western Scientific ...sdcsvax!westsci!jc