[vcf-midatlantic] Workshop Jan. 30/31 Report

David Gesswein djg at pdp8online.com
Mon Feb 1 07:33:58 EST 2016

On Sun, Jan 31, 2016 at 11:44:48PM -0500, Jeffrey Brace via vcf-midatlantic wrote:
> Can others tell what they worked on and their progress?
Worked on the straight 8. I fixed the known fault of accumulator bit
going to zero when it was rotated left. This was a bad diode on one
of the accumulator boards. I also replaced two bad bulbs and a third
that died during the repair. Since one that died was one I previously
replaced I'm going to use the not quite matching bulbs with heavier
wires for future repairs. The wires are just too thinn on the 1762 bulbs
and now that they have aged they break too easy.

I then found that the teletype interface wasn't working and replaced
a diode on a R220 to fix output. Input is not working properly. I have
traced it to a particular flip flop on a R220 where when the data
changes it feeds through to the output without the clock active.
I ran out of time to identify the component that needs replacing.

The teletype is also not working properly. I did not get any time to
look at it. 

I also helped Herb with his 8/A. I will let him describe that activity.

Had a good time talking with people and seeing what they were working on.

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