[rescue] Sun 3/160 and CADDStation 32 deskside

[Dave McGuire]

On 6/4/25 12:03, Alan Perry wrote:
>>> The 8M board that I have always returns a particular bit position as high for every address. It seems like a problem like that wouldn't be hard to figure out if I knew something about hardware.
>>
>>   It's actually pretty hard to figure out.  It's a multi-layer board, and component placement is arbitrary.  You'd have to trace back the chip select lines from the address decoders and data buffers.  It's not a hardware knowledge thing, it's a needs-Sun's-design-documentation thing.
> 
> This is why I am a software/firmware guy ;)

   ;)

>>> As far as the 3/160, the 2M board is 501-1131.
>>
>>   Have you ever seen one in the wild?
> 
> I have never seen either a 4M or a 2M board. I looked through my VME board collection and it turns out I have another 3/160 but no optional memory.

   I've seen and used quite a number of the 4MB boards.  Never the 2MB 
version.  I've never come across anyone who has ever actually seen one, 
so I've always doubted that they ever actually shipped.

> How does a CADDStation do its thing on 4

   It would have to be some damn efficient coding.  SunOS itself 
struggles just a bit in 4MB.

> Do you know anything about Counterpoint memory boards (for Sun VME)? I got one of those with the CPU boards on Sat but can’t find anything about its capacity (though I guess I could see what memory parts are on it and do the math) or how to set the jumpers.

   I'm sorry, no I do not.

               -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA