LR>>Thanks for outlining the pupose of the LAN - very onteresting.  Very
LR>>similar for a system I worked on - similar structure.  Do you recall
LR>>what LAN and when - what version perhaps?

This was PC-Net, later upgraded to Token Ring.  Sorry I can't help you
with the version; don't remember now.

LR>>Makes a lot of sense.  What is the highest rate of polling?  Was this a
LR>>"thin film" process (since you mentioned clean rooms)
control system?

Yes, it was.  Chip manufacturing environment.

LR>>Was OS/2 used?

The earliest version I worked on was actually built on top of PC-DOS.
The client wrote a "sorta-realtime" executive that sat on top of DOS and
monitored the various tasks that had to run according to an assigned
priority.  Basically a polling loop.  You can see that there wasn't a
lot of room left after loading DOS and the executive in 640K.  As you
might expect, things started to fall apart quickly when too many tasks
were contending for the resources. Consider the analogy to singing dogs;
the wonder is not that they do it well, but that they do it at all!  I
remember those versions having to be rebooted all the time after they
went casters up when the contention got too heavy. Later versions were
rewritten under OS/2 1.2 (later upgraded to 1.3) which were *much* more
stable.  I don't know if they ever upgraded to 2.x, the theory being "if
it ain't broke, don't fix it."

LR>>I am a Contractor.  Are you an Independent Contractor/Consultant?  If
LR>>so, there may be some possibilities I can discuss with you (via
LR>>Netmail) - if you are interested - in lower NY area.

An unequivocal maybe.  I am currently an independent, but am not really
interested in relocating to that area again.  However, I'm open to
discussion if this could be done remotely.  Let's talk Netmail; I'm at
1:325/118 or 1:326/116.
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 X SLMR 2.0 X Bus - Vehicle used by the data to commute to work

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