21 Nov
1999
21 Nov
'99
2:34 a.m.
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
One point about "symmetrical"... you _do_ have the core plane in right-side
up, don't you? IIRC, the OMNIBUS side of the core stack is the one with only
grounds on it; the connectors with all the signals going to and fro is for
the top.
I'm not saying you did it, but it'd be easy to reinstall the stack with the
top side down.
-ethan
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Been looking
through the maintenance manual, and it looks like among the
things I need to do tomorrow to check this out is to test voltages on both
the G104 and G227 boards. This has me wondering, does it matter if the
order is G104/H220/G227, or can you order it like G227/H220/G104 for
testing so you can take readings on the G227 board?
AFAIK, you must put the core stack in the middle (so the top connectors
all fit), but you can have the outer boards either way round. All Omnibus
slots are equivalent, and the top connectors are symmetrical as well. 
21 Nov
21 Nov
5:58 a.m.
One point about "symmetrical"... you _do_
have the core plane in right-side
up, don't you? IIRC, the OMNIBUS side of the core stack is the one with only
grounds on it; the connectors with all the signals going to and fro is for
the top.
I'm not saying you did it, but it'd be easy to reinstall the stack with the
top side down.
Excellent question, I'd not even considered this. Unfortunatly, or very
likely fortunatly it was in there properly. Two reasons for that, one
that's the way it came, and secondly the sticker that says it's a 4K core
plane.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
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+----------------------------------+----------------------------+
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6:26 a.m.
At 11:58 AM 11/21/99 -0800, Zane wrote:
Excellent question, I'd not even considered this.
Unfortunatly, or very
likely fortunatly it was in there properly. Two reasons for that, one
that's the way it came, and secondly the sticker that says it's a 4K core
plane.
Remember, the CPU cards could have a blocked connector as well, they
generate the write signal.
--Chuck
9:44 a.m.
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