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Re: Python programming

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From Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject Re: Python programming
Date Wed, 12 Feb 2014 21:13:51 -0500
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On Wed, 12 Feb 2014 11:43:09 -0500, Larry Martell <larry.martell@gmail.com>
declaimed the following:

>
>I think it was a Xerox Sigma:
>

	WHERE?!!!

	The only places I know of that had Sigma's were NASA, Missile Systems
Division of Lockheed Missiles & Space (Sunnyvale, 1981 -- they were
drafting a set of requirements to replace the Sigma. I looked at those
requirement and concluded there was only one viable alternative -- a
Honeywell DPS-8 running CP/6; the requirements specified the CP/V
In/Out/Update/Scratch file modes, and I've never seen any other system that
had Update/Scratch*... Also specified the equivalent of consecutive, keyed,
and random file organization), McDonnell-Douglas "McAuto", and... Wayne
State, Hope College, and Grand Valley (all three in Michigan... GV was
mine)


*	For the bystanders: Update and Scratch maintained separate read/write
file positions. An Update file required one to read one or more records
before writing, the write position trailed the read position. Scratch was
the opposite; one wrote data and then could read it back later -- the write
position had to be ahead of the read position.

	Oh,  consecutive was equivalent to a UNIX stream file; no structure.
Keyed was ISAM (and even the text editor used this -- the line numbers were
ISAM keys). Random... Was a preallocated /contiguous/ block of disk -- the
OS did nothing for structure.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

Python programming ngangsia akumbo <ngangsia@gmail.com> - 2014-02-11 16:21 -0800
  Re: Python programming Chris Angelico <rosuav@gmail.com> - 2014-02-12 12:17 +1100
  Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-11 21:06 -0500
  Re: Python programming Rustom Mody <rustompmody@gmail.com> - 2014-02-11 18:46 -0800
  Re: Python programming Roy Smith <roy@panix.com> - 2014-02-11 22:02 -0500
    Re: Python programming Gene Heskett <gheskett@wdtv.com> - 2014-02-11 23:14 -0500
    Re: Python programming Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 13:41 +0000
    Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-12 21:00 -0500
      Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-02-13 02:57 +0000
        Re: Python programming Roy Smith <roy@panix.com> - 2014-02-12 22:04 -0500
          Re: Python programming Chris Angelico <rosuav@gmail.com> - 2014-02-13 14:13 +1100
            Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-02-13 15:13 +0000
          Re: Python programming William Ray Wing <wrw@mac.com> - 2014-02-12 22:56 -0500
            Re: Python programming Dan Sommers <dan@tombstonezero.net> - 2014-02-13 05:18 +0000
          Re: Python programming Larry Martell <larry.martell@gmail.com> - 2014-02-13 03:30 -0500
  Re: Python programming Asdrúbal Iván Suárez <asdrubalivan.listas@gmail.com> - 2014-02-11 20:01 -0430
  Re: Python programming Ben Finney <ben+python@benfinney.id.au> - 2014-02-12 15:09 +1100
  Re: Python programming Larry Martell <larry.martell@gmail.com> - 2014-02-12 08:55 -0500
    Re: Python programming Roy Smith <roy@panix.com> - 2014-02-12 09:13 -0500
      Re: Python programming Larry Martell <larry.martell@gmail.com> - 2014-02-12 11:43 -0500
      Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-12 21:13 -0500
  Re: Python programming Tim Delaney <timothy.c.delaney@gmail.com> - 2014-02-13 08:02 +1100
  Re: Python programming Chris Angelico <rosuav@gmail.com> - 2014-02-13 08:34 +1100
  Re: Python programming Tim Delaney <timothy.c.delaney@gmail.com> - 2014-02-13 09:57 +1100
  Re: Python programming Neil Cerutti <neilc@norwich.edu> - 2014-02-13 15:30 +0000
    Re: Python programming ngangsia akumbo <ngangsia@gmail.com> - 2014-02-14 12:29 -0800

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