Re: IBM mainframe history, was Floating-point myths

In article <5su4rgF1apm8rU1@xxxxxxxxxxxxxxxxxx>, comp.arch,
delcecchinospamofthenorth@xxxxxxxxx says...
Eric Smith wrote:
Del Cecchi wrote:
The metastability issues in the model 85?
I just remember how I made a practice of
hitting save every 5 minutes while entering simulation models into a 2260
connected to a model 85 running MTMT (Rochester's home grown Multiple
Terminal Monitor Task written because TSO was such a pig, and VM wasn't
around) because the likelyhood of the system crashing was so high. We
got them because a customer gave them back -- story involved threats of
tossing off cliffs or perhaps dumping in rivers but that is all folklore.
It was years later I met some guys in E. Fishkill who said that it was
metastability in the cache interface somewhere. Perhaps the old faux
paux of sampling an asynchronous signal in more than one place.

So did they eventually fix these in the field? I don't know how many
85s were built, but I can't imagine that they took them all back and
flogged them off cheap to universities.

I don't think many were built. The model 90 or 91 came out and then
370. I wonder if somewhere there is a site with the production statistics?

There were a pile of 'em in P'ok. ISTR they were "pre-purchased"
from customers.

--
Keith
.

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