9-segment Panaplex display is now alive

[gregebert]

It's a Burroughs BR13404 unit from an HP counter (if anyone knows the model number, PLEASE post!). I was lucky to get this one from Ebay over 10 years ago, and have not seen any others since. It's the last major part of my RZ568m clock in the background, and uses an FPGA to run the multiplexing. There is minor ghosting between the 2 words, which I'm investigating but so far I'm having a hard time reproducing it with directed tests. This is my first nixie-multiplexing project, and the only reason it's multiplexed is because the individual pins dont exist. Fortunately I have a lot of software-controllable "knobs" in the FPGA hardware so maybe I can solve the ghosting that way, or make a simple logic change to kill the anode when no cathodes are lit.

[Rob B]

This:

https://www.sphere.bc.ca/oldsite/test/nixies2.html

says HP 5360, but I was thinking that was a nixie-based counter.

...R

[Rob B]

And here it is in a calculator:

http://www.rechenkasten.de/Walther/ETR/ETR_21/index.xml

On Friday, April 25, 2025 at 11:23:19 PM UTC-5 gregebert wrote:

[gregebert]

Oh yeah, I vividly remember that one for sale from Sphere Research. I tried to buy it many years ago, but it was already sold.