[vcf-midatlantic] A few workshop notes
hjohnson at retrotechnology.info
Mon Apr 30 10:57:34 EDT 2018
I was able to come out to the workshop on Sunday, and work on an unusual
computer I obtained. It's a Motorola EXORset 30. It's a 6809 development
system running an XDOS OS on floppy, and supported by Motorola's
EXORbus bussed backplane. It came up without a lot of fuss. It needed
some careful AC power conditioning to the power electrolytics.
I gave some support to Adam, who was able to operate his SGI Indigo
computer for the first time, thanks to a keyboard and mouse I provided.
I chatted with several people attending, providing sage wisdom about
problems with RAM, switching speeds of diodes, pressure rollers on tape
drives. I removed some rust from a couple of dot-matrix printers, and
was surprised to find they could still print!
Thanks to Jeff Galinat, who leant me AC cables and a 360K diskette; and
to Jeff Brace for his support of and at the Workshop.
Of course, I learned a lot about how my friends were diagnosing these
issues. The depth of talent on site Sunday was amazing. It's rare and
informative, to discuss 3-volt negative logic and the switching speeds
of diodes at one point, then the problems of aged hard-rubber rollers at
the next moment. I learned more about the early history of Apple II
products. I got under the hood of some early Commodore PET's to see the
less-than-industrial designs they produced early on. Any of these repair
and preparation activities could be discussed at length.
And it's a pleasure to see what the Museum's UNIVAC is able to do, even
as more work is in progress. To think that other shipboard computers
like that, were operating at sea in the late 1970's is astounding. Then
to have one operational today, that's a great gift. That's also true of
the PDP-8 "straight-eight", which was under repair at the diode level
this weekend. And it's good to see my friends again, see and hear about
them and their work and history with vintage computing. Even the weather
Herbert R. Johnson, New Jersey in the USA
http://www.retrotechnology.com OR .net
More information about the vcf-midatlantic