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.

On Saturday, April 26, 2025 at 1:32:40 PM UTC-7 Rob B wrote:

> 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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