Will (following others) wrote:
>>> There were
>>> three versions of the S900 board that I know of. A few early boards
>>> have a jumper pin which lets you disable the motherboard L 2 cache.
>>
>> So, if I have pins at this location I can infer it's one of the early
>> mb's?
>> (This is the J38, correct?). Is there a manufacture date stamped
>> anywhere?
>>
>> Charles
>
> I believe that to be correct but only Kennedy would know for sure. I
> looked at my extra machine and it says revision A next to the serial
> number and has no jumper pins. Doesn't really have a date other then
> UMAX Stormsurge 1996 stamped on board.
> Jeff W checked motherboards out pretty closely including chips on the
> boards a while back and found no differences at all except for a few
> people having the J38 jumper pins to disable L 2 cache. I'm sure he
> will correct me if I'm wrong ;-)
> Differences in the way different machines act has been traced to cards
> ,cpu ,ram chips and software added. later Will S
That's correct, as far as I know. The revision letters weren't always
entirely meaningful. We tried to make them so, but the Taiwan-based
manufacturing group didn't always stick to the protocols that Engineering
tried to lay down. Revision A boards have a better chance of having the
jumper pins, but it's not absolute.
I have an S900 up in the attic. Just checked, and it's a Rev. C -- no
jumper pins at all at J38. Still trying to decide what I want to do with
both this machine and my sweet little J710. I'll probably sell them both
soon. I hate to see them sitting unused.
There *is* a date code embedded in the serial number, but I'll have to dig
through some old records to find the exact methodology. Like Apple, the
serial numbers should include the last digit of the year of manufacture ("7"
for 1997), followed by the week of the year ("07" would mean late February,
"49" would mean early December, etc.), and the actual serial number (usually
the last four digits). I can't remember if it's structured exactly like
this, but it was close.
-Kennedy Brandt
SuperMac Insider (http://home.earthlink.net/~supermac_insider/)
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