Re: IBM mainframe history, was Floating-point myths

Eric Smith wrote:
I wrote:
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.

Del Cecchi <delcecchinospamofthenorth@xxxxxxxxx> writes:
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?

Even if there weren't many, if the problem was as serious as you describe,
the paying customers must have been screaming bloody murder.

According to Appendix A of _IBM's 360 and Early 370 Systems_ by Pugh et al,
the 360/85 first shipped in December 1969, while the 360/91 first shipped
more than two years earlier, in October 1967. I suppose it's possible
that IBM replaced purchased 85s with 91s, but it seems somewhat doubtful
as the 91 was a much bigger, and presumably much more expensive machine.

Other than the 370/195, there wasn't a 370 that would outperform the
360/85 until mid 1973.

I was just guessing. I was off making world safe for democracy from 10/70 to 7/73 thanks to some guys in washington and in st paul who thought uncle sam needed me worse than IBM did. Seems to me we were running the site on a couple of 65's that got replaced by 85's in that time frame. We had the 85s until we got some 165s or 168s to replace them.
.

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