Article View: alt.sys.pdp8
Article #69Re: The good old days.
From: Jonathan E. Quist
Date: Thu, 19 Nov 1992 15:32
Date: Thu, 19 Nov 1992 15:32
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In article <1992Nov19.102634.20745@vpnet.chi.il.us> cgordon@vpnet.chi.il.us (gordon hlavenka) writes:
>Another interesting pdp8 trick: Since we had (4) ASR-33s as our only
>IO, we wrote a "fourple loader" which would read a clunk from each TTY
>in turn. (The first character was on tape 1, the second on tape 2,
>etc.) This ended up being almost 4 times as fast as loading
>through 1 TTY, since most of the time was spent just waiting for the
>reader to come ready again. Each TTY used a tape with a different
>leader character, and the loader would figure out which tape was in
>which TTY. Nowadays I think they call this "reverse multiplexing."
I love it! Paper tape striping!
Jeez - if you could add enough serial ports, you could attempt paper
tape virtual memory..... nah.
--
Jonathan E. Quist INTERACTIVE Systems Corporation
jeq@i88.isc.com '71 CL450-K4 "Gleep", DoD #094 Naperville, IL
There are many things a person should experience in a lifetime.
Among them are an infant's first cry, and an infant's first laugh.
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Newsgroups: alt.sys.pdp8 Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!rpi!newsserver.pixel.kodak.com!laidbak!jeq From: jeq@i88.isc.com (Jonathan E. Quist) Subject: Re: The good old days. Message-ID: <1992Nov19.153247.13348@i88.isc.com> Sender: usenet@i88.isc.com (Usenet News) Nntp-Posting-Host: birdie.i88.isc.com Organization: INTERACTIVE Systems Corporation, Naperville, IL References: <1992Nov18.235407.12864@reed.edu> <1992Nov19.102634.20745@vpnet.chi.il.us> Date: Thu, 19 Nov 1992 15:32:47 GMT Lines: 19