[rescue] Sun 3/160 and CADDStation 32 deskside

[Dave McGuire]

On 6/3/25 20:26, Alan Perry via rescue wrote:
>>   Yes, absolutely correct.  The 32MB board is the same design as the 
>> 8MB board but using higher-density DRAMs.  I should've been more 
>> thorough, but..."morning".
> 
> That's OK. Without the references handy, I can't remember much.

   At least you have that excuse.  I've been working with these systems 
recently at the museum. :-(  Guess I'm getting old.

> You wouldn't happen to know how to trace a faulty memory issue to 
> particular location on the 8M board, would you?

   No, I'm sorry I don't.

> 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.

> As far as the 3/160, the 2M board is 501-1131.

   Have you ever seen one in the wild?

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA