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On the IBM System 360 processor range, these facilities were provided by front panel switches, buttons and banks of neon lights.
BOS was one of four System/360 Operating System versions developed by the IBM General Products Division (GPD) in Endicott, New York to fill a gap at the low end of the System/360 line when it became apparent that OS/360 was not able to run on the smallest systems.
The original System/360 models of IBM mainframe had read-only control store, but later System/360, System/370 and successor models loaded part or all of their microprograms from floppy disks or other DASD into a writable control store consisting of ultra-high speed random-access read-write memory.
When developing a new hardware generation of unified System/360 (or S/360) computers, IBM had originally committed to delivering a single operating system, OS/360, also compatible with low-end machines; but hardware was already available and the OS/360 project fell further and further behind schedule, as described at length by Fred Brooks.
Houston Automatic Spooling Priority, a system program for IBM System/360 and IBM System/370 mainframe computer systems
They will attach to IBM System/360 or IBM System/370 mainframe computers through IBM 3705 communications controllers, and supported by 3705 Network Control Program and mainframe software such as CICS and IMS.
The IBM System/360 Model 40 was developed and manufactured at IBM's facility in Poughkeepsie, U.S.A.: manufactured in Mainz, Germany; and manufactured in Fujisawa, Japan.
The System/38 was a descendant of the abandoned IBM Future Systems project, which had been designed as the replacement for the System/360 and System/370 mainframe architectures.