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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