Beckmann SP-101

[BEKot]

Anyone have pin out info for Beckmann SP-101? It is a one digit panaplex with 21 pins. Thanks.

[gregebert]

The best I can suggest is to infer the pinout by looking at the placement of the pins on the back-side in relation to the various cathodes visible from the front. I did this with a similar display (SP-151). The anodes are copper-colored electrodes; everything else is a cathode. The segment current is probably 335uA, assuming this is the same size as other Sperry (Beckmann) displays from this era. I recall the ionization voltage is 180V, and the sustaining voltage is around 135V.

The smaller objects (triangles, dots, etc) will run at less current. I guesstimated 35uA for my wristwatch; I'll know in a few weeks if the numbers I gave are good when I finally power it on.

These displays dont have pins on 0.1" coordinates, so you cant put them into a predrilled breadboard. Do not try to force it into a 0.1" grid because there will be excess stress on the pins, and it could  cause the glass envelope to break. When I made my PCB footprint for the SP-151, I had to carefully measure (and re-measure, many times) all of the pin locations with a caliper. I'm happy to say the display fits onto the PCB.

[NoCampersFluffy]

[Nick]

Reviving an old thread... This is an update of the previous sheet and also includes the SP-102, as well as pin diagrams etc.

Nick

[Greg S]

Thanks, it is a much better version I ever saw!

[Richard Scales]

Would anyone out there have any SP-101 that they might be willing to sell to me? PM me if you do.

- Richard

[Nick]

It came direct from Burroughs' archives - they're quite responsive to direct requests for information.