My UNISYS work on 1100 systems ran from 1983 to 1986. At that point, I moved to another project replacing rooms full of DEC 11/780 machines running COSNIX with UNISYS/7000 (CCI Power 6/32) processors. Demand paged virtual was a big win. I had to do lots of kernel fixes before it was satisfactory for deployment across the Bell System. One of my favorites was fixing the kernel CPU scheduling algorithm. It ran like a dog when doing batch processing. The algorithm was BSD tilted in favor of interactive use. We had linemen hanging off poles for an hour waiting for processes to finish. I sent my improvement to the manufacturer in Irvine, CA for their staff to evaluate. The report back was a "new problem". Their system had 100 dialups and never had more than 3 in use because of the terrible performance. The "new problem" was busy signals. All 100 lines were in use and the machine was performing with no discernible latency. It was a big improvement. To get it rolled out to the other BOCs, they had to name it the "Bellcore scheduler". My little operation at PacBell didn't have the reputation.
That was all before my time.
I was hired in 1994 we were doing Win NT installs.
you guys were amazing though saw LOTS of Experience retire over the years with nobody to replace them.
I spent a lot of time just doing service calls.
IRS, SSI, Banks, DMV’s, prisons, cop stations, secret service, etc, etc..
Thats where i saw most of the Gov obsolescence.
A LOT of dot-com bubble companies..
It was pretty interesting work going to all of those places every day.
i kinda miss it now..