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RS/6000 J50/R50/SP2-high CPU cards

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Kevin Bowling

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Dec 31, 2009, 3:57:49 PM12/31/09

I'm curious about the CPU cards as used on the 7013-J50, 7015-R50, SP2
High Node, etc.

There were a TON of FRUs for the 200MHz part. I saw an ancient post
on this group that said IBM had a lot of trouble with the design of
this card.

After the 'X4D', it seems it was replaced by the '4EG'. I have 3 X4D
and 1 4EG on hand. The 4EG has tons of large capacitors added and the
PCB is darker green but otherwise looks nearly identical.

Are there retain tips that state what the screwups were, or what the
engineering changes between the FRUs and X4D->4EG are? Anybody
remember from memory?

Tim WBST Clarke

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Dec 31, 2009, 10:11:49 PM12/31/09

Hi Kevin...

"Kevin Bowling" <kevin....@gmail.com> wrote in message
news:504dbefc-51fd-4d89...@j4g2000yqe.googlegroups.com...

My J50 has 3 dual-cpu cards and I believe I have another spare, as Pete
Backhouse dropped out of contact before collecting the spare J50 I'd picked
up for a song. It'll take me some time to get around to analysing and
photographing the cards, but I would guess that it would mostly be signal
frequencies and levels that might have be problematic.
--
Cheers,
Tim Clarke (a.k.a. WBST)
Guildford U.K.

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