OK - I've banged on the new version with extra debug messages and it still locks up, but without any messages! I can only conclude that the 486MB BIOS is iffy. I haven't tried any other slots in the MB, but have tried various PCI settings, all to no avail. I have swapped the de0 and the rl0 between machines, and the rl0 is happy in it's new home - hasn't fallen over, although it's netpipe performance sucks with very small packets. I think we can write this one off as a faulty PCI implementation on the 486 motherboard. Thanks for your patience & time.
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