[rescue] Clearpoint RAM - was Re: Sun-3 memory board troubleshooting

[Toby Thain]

On 2017-08-04 10:01 AM, Earl Baugh wrote:
>> From: Scott Quinn <saquinn624 at aol.com>
>> Subject: [rescue] Sun-3 memory board troubleshooting
>> Content-Type: text/plain; charset="us-ascii"
>>
>> I pulled out my 3/110 for verification of my spare 3/110 CPU, but now
>> under heavy diagnostics the 3/110 shows a parity error on the 12MB+SCSI
>> expansion board.
>>
>>
>> I tried re-seating all the chips, no change.
>> The error on the console is "Parity error at address 0x00D3F428 EXP
>> 0x2C5A5A97, Obs 0x2DA5A97" (and the expected parity calc.)
>> Anyone have tips for how to map from the address to the board-level ICs on
>> the Sun-3 memory expansion/SCSI card? I have some spare memory chips out
>> from fixing a parity issue on the spare CPU board.
>>
>>
>
> If you find any docs, please let me know.  I have a 16MB VME card that has
> a similar parity error. (Can't remember the manufacturer, Choicepoint,
> Checkpoint, something like that...) .

There are some Clearpoint documents on Bitsavers and Internet Archive.

--Toby

 > However the chips are all soldered
> (not socketed :-( ) .  So, I've not attempted the gargantuan task of
> unsoldering all of those and adding sockets.  I'd DEFINITELy prefer to do a
> less dramatic surgery and just replace the one (or few) that are bad.
>
> And if you ever stumble over other Sun 3/110 spares, please let me know!!
>
> Earl
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