3.9k Ohm Diagnostic mode on a P4.

[Peter Gargano <peter@techedge.com.au>]

I was told once that using a 3.9k DIAG resistor would force
Backup Mode. This is apparently similar to Limp home mode but
the processor is still operating (normally Limp home mode is
selected by the analogue processor when it's not initialised
by the CPU - when the EPROM or CPU has gone to lunch).

Can anyone shed some light on how this mode is used by either
the factory, or for field service? Specifically this is for a
1227165 and the answer may depend on the actual BIN used (?)

Peter.
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