I seem to remember working with some S/360 Model 55 MPs at an FAA Air Route Traffic Control Center in 1978. They must have had smaller maximum real memories and run slower than model 65MPs, but had the same RPQ extra instructions to enable multi-processing. Bill Fairchild
----- Original Message ----- >From: "Anne & Lynn Wheeler" <[email protected]> >lots of problems with 360/65 mp which did have shared memory ... but no >shared i/o ... dedicated processor channels simulated multiprocessor i/o >by connecting processor-specific channels to different "tails" on >multi-tail control unit. also 360/65 os/360 mp support used test&set for >very gross level spin-lock (significantly exacerbating any recovery >scenarios). at the time, ibm definition of mp was that the system could >be (manually) partitioned into two independently running systems (when >3081 came out the new term was dyadic, since it was not possible to run >the two processors independently) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
