UDA50/RA81 problems....

[Andrew Stewart]

We are running a VAX-11/750 under 4.2BSD with an RA81 driven from a UDA50;
like a number of other sites, we have experienced the ra81/uda50 going
offline for no apparent reason. Does *anyone* know what causes this?
Is there a cure?
Is it a problem in the uda50? The ra81? The driver software?
Is it (as I suspect) a UBA timing window problem?
Any pointers or ideas would be welcomed. I will, as usual, summarise.

Andrew Stewart,
Dept. of Computer Science, Heriot-Watt University, Edinburgh.