This:

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

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

...R


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

> [image: IMG_0669.jpg]
> 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.
>

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