PDP-8 chase the lights

[Mike Ross]

Nicely done! I don't think I've seen that one before; can you supply a
quick toggle in?

Mike

On Wed, Feb 3, 2016 at 9:26 AM, Evan Koblentz <cctalk at snarc.net> wrote:
> Our group here in NJ + surroundings now has monthly-ish repair workshops
> (vs. a few times per year before). At the workshop this past weekend, David
> Gesswein continued restoring our PDP-8.
>
> David summarized: "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."
>
> Here's a little video of the computer chasing its lights. :)
>
> http://www.vcfed.org/evan/pdp8lights.mp4



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