On 22 December 2013 15:11, DASDBILL2 <[email protected]> wrote: > 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.
I know nothing about FAA custom hardware, but the 65MP had no RPQ instructions related to multiprocessing. It used the standard (though optional) Read Direct and Write Direct instructions, with the direct interface on each CPU plugged into the matching one on the other. The 370/165 and 168 also had RDD/WRD as standard. I spent some idle time poking around late one night trying to find the connectors, and eventually got the CE to find them in the book. They turned out to be in back of the console unit (3066). The same hermaphroditic connector used for B&T channels, though with different pinouts, of course, is used for the Direct I/O feature. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
