WTB: DEC PC04 Paper Tape Reader/Punch
ethan.dicks at usap.gov
Mon Aug 18 17:44:25 CDT 2008
On Mon, Aug 18, 2008 at 10:55:14AM -0700, Vincent Slyngstad wrote:
> From: "Ethan Dicks"
> >*But*, you could read the tape one way, flip it _and_ read it backwards.
> >Syncing up the two passes is just an exercise for the student ;-)
> Alas, that wouldn't help with the bad phototransistor.
Ah, yes... I didn't do the right transformation in my head.
> >Personally, my PC04 is the primary load device for one of my PDP-8/Ls.
> >I'd be hurting if I lost a phototransistor - the SMT idea sounds handy.
> It sounds interesting to me too. Are there detailed specs for the
> phototransistor array, or would I have to take my PC04 apart and
> measure everything?
I have no idea. I was just referencing a recent post about someone
mentioning making a functional reconstruction.
> >What I'm more worried about is a spare bulb - It's a "festoon" bulb
> Well, there's this sort of thing:
> The tricky part for these seems to be getting ones that will work well
> on 5V.
> Isn't it basically exactly an old-school 6V automotive dome light?
It was a dome light, but I'm not certain about the voltage right now.
It's entirely possible it's a 6V bulb derated to 5V, but I'm not sure.
> I wasn't able to find a part number for the original, so I don't know
> the original dimensions, either. There seem to be at least a couple
> of common lengths.
I remember that being my experience as well. Fortunately, I _do_ have
a bulb, so I can measure it.
> Curious that the documentation doesn't suggest stocking a replacement,
> or even tell you what part to use.
Yeah; I don't remember ever running across any official docs about it.
The best I recall is finding an Osram part number _somewhere_, but
not being able to find that bulb in their modern catalog and no
> If it's DEC part number 12-04903, then that's available here:
Thanks; that certainly resembles the original, but, again, I'm not
sure about the voltage.
Ethan Dicks, A-333-S Current South Pole Weather at 18-Aug-2008 at 22:40 Z
South Pole Station
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Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
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