Subject: |
re: VME bus confusion |
From: |
"Dr. Pete Jemian" <[email protected]> |
Date: |
Thu, 25 May 1995 16:43:31 -0500 |
>
> 1) There MUST ALWAYS be a board of some kind in EVERY slot of the VME
> crate starting on the left and working right. If you MUST have
> a missing board, you may simulate it by installing the BG and IACK
> jumpers often found on the VME backplane.
>
> Failure to follow this rule causes very strange things to happen.
> Common sense does not seem to apply to this easier... don't think
> that just because a board does not generate IRQs or operate as a bus
> master that things will still be OK. We have seen otherwise!
Not to throw grit in the gears of progress but the VME crate nearby has
a pretty wide gap between the few modules on the left side of the crate
and the MVME 162 coprocessor running HiDEOS. Numbering from 0 at the
left of the crate, slots 0-5 are filled, 6-13 are empty, 14 is filled
(the 162), & 15-19 are empty. No complaints from EPICS, VME, or ...
It seems to work. Must be a miracle. However, on reading the above
advice, this crate will be told to get with the program.
> If anyone ever calls me again with a problem that is caused by
> this... the service charge will be a 6-pack of Miller Highlife in
> bottles. Viva le Champaign of Beers!
>
>
> --John
>
This, too, can be arranged.
Pete
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