[rescue] SUN 3/50 IDPROM chip replacement

[Jonathan Chapman]

Jan,

Looks like some of the arcade supply places have blanks for around $10, I can program them on my Data I/O 29B, so if you want I can program one for you! I have a Sun 3/50 I can test in.

The outputs for that part # are open collector, which is going to be hard to find in a modern replacement (pretty much all modern EPROMs/EEPROMs are tristate outputs).

Thanks,
Jonathan

On Friday, February 2nd, 2024 at 04:15, Jan Liška via rescue <rescue at sunhelp.org> wrote:

> 
> 
> Hello!
> 
> I’m restoring an old SUN 3/50M and its IDPROM chip is missing, which results in "ID PROM invalid error" when the machines tries to boot from net.
> 
> I found out that the PART # is 520-1295 and the chip is 32 bytes bipolar PROM, probably Signetics 63S080 PROM requiring a special programmer.
> 
> Is there any modern replacement or alternative available?
> 
> Thank you.
> 
> Jan
> 
> sources:
> http://john.ccac.rwth-aachen.de:8000/misc/sun3_60.html
> https://archives.retrobridge.org/sun/system-handbook/3.4/Systems/Sun3/CPU_03_IDPROM.html
> 
> 
> 
> 
> 
> 
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