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From: Dave Plonka <>
Subject: [TUHS] PDP 11/23 running UNIX version 6 at VCF Midwest!
Date: Sat, 18 Dec 2021 19:00:04 -0600	[thread overview]
Message-ID: <> (raw)

Hi folks!

While doing some end of year retrocomputing revisiting, I thought some
of you might enjoy this - there is hope for the next generation(s)! ;)

In this video I share my personal pick for "best"  demo at VCF
Midwest: Gavin's PDP 11/23 running UNIX Version 6!  We write and run a
simple BASIC program in Ken Thompson's bas(1), finding some quirks
with this (currently) entirely floppy-based system, possible having to
do with a glitch in disk I/O. (We discovered bas(1) uses a temporary
file as backing store.)

Filmed at the Vintage Computer Festival Midwest: VCF Midwest 16,
September 11, 2021

Here's the source code to the simple program we wrote; you can also
run it on modern machines if you install a Research UNIX version using
SimH (pdp-11 simulator).

5 goto 30
10 for col = 1 arg(1)
12 prompt " "
14 next
20 print "Welcome to VCF Midwest!"
25 return
30 for x = 0 55
40 10(x)
50 next
60 for x = _56 _1
70 10(_x)
80 next


             reply	other threads:[~2021-12-19  1:00 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-19  1:00 Dave Plonka [this message]
2021-12-19 17:25 Paul Ruizendaal
2021-12-20 15:43 ` Dave Plonka
2021-12-20 16:30   ` Clem Cole
2021-12-21 21:42 Noel Chiappa

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