[net.micro] Cray-1 shutdown sequence

pdbain@bnr-vpa.UUCP (07/14/86)

We all know that you need three or four HLT instructions to
stop a Cray (the first one usually works, the rest are in case it
skids), but few people know that you also have to put a bunch of NOPs
before the HLT. This clears the pipelines prevents damage due to to
the inertia of the data. Think about it - you have a bunch of 64
bit floating point numbers truckin' along at up to 100 MFLOPS,
and you try to stop them suddenly - you are bound to wreck something.

	-peter "Those whom the Gods would destroy, they teach BASIC" bain