[rescue] Anyone Familiar with VMEbus?

Christopher Purdy escher.beretta.2112 at gmail.com
Fri Sep 17 12:58:50 CDT 2021

>    I have a lot of experience with VMEbus, but this sounds less like a
> VMEbus issue and more an issue with your boards.
>    SYSFAIL is a signal on the VMEbus that any board can assert.  It's an
> active-low, open-collector signal, which means it can be pulled down
> (asserted) by any board in the backplane, but has to be pulled up by
> something with a pullup resistor.  Sometimes that's done by the CPU
> board (or other bus master) but sometimes that pullup resistor is on the
> backplane.
>    If there's no SYSFAIL pullup resistor on your backplane, then it
> being low (and lighting that LED) when there are no boards in the
> backplane is the expected result.
>    "Fault" is not a VME signal that I recognize.
>    I too have a PUMA robot here, but I don't have the original Staubli
> controller for it, at least I don't think I do.  I will check the next
> time I'm in that building.
>               -Dave
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Hmmm.... Thats what I was worried about... probably more than I will be
able to diagnose.

A buddy and I shuffled everything into storage for the time being.

I have a line on an identical setup with the same arm / controller about an
hour away for the same price I just picked this one up for.  The gent who
owns it said he will let me come by and test the controller...

So I think I'll take a terminal and my cabling up with me (he doesnt have
cabling) and see if I have any luck.... if so, I'll get another arm cheap
for the price of the controller.. if not, I'll wait until I can find a

Once I have a good controller I can swap and test cards to see which ones
are good..

Christopher Purdy
Personal Page --> escher.squarespace.com
Observatory Page --> www.promethean-visions.com

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