Known as the RC 4000 multiprogramming system, it is the first real-world example of a system using an extremely simple kernel along with a variety of user-selected programs that built up the system as a whole.
42.
He also contributed to new operating systems such as Edsger Dijkstra's THE multiprogramming system, the Family of Operating Systems ( FAMOS ) at Carnegie Mellon, Berlin's Dynamically Adaptable System ( DAS ), and UNIX.
43.
In 1969, the RC 4000 Multiprogramming System introduced the system design philosophy of a small nucleus " upon which operating systems for different purposes could be built in an orderly manner ", what would be called the microkernel approach.
44.
The first 1108 computers used symmetric multiprocessor versions of the 1108 with up to 4 processors and the earlier operating systems ( really " basic monitor " programs ) weren t designed for that, even though they supported limited multiprogramming.
45.
While there had been support for multiprogramming in previous systems, it was limited to running one user job concurrently with multiple supporting functions known to be well-behaved, such as the card reader, printer, and card punch spoolers.
46.
In 1961, the B5000 had virtual memory, symmetric multiprocessing, a multiprogramming operating system ( Master Control Program ( MCP ) ), written in ALGOL 60, and the industry's first recursive-descent compilers as early as 1963.
47.
The first computer using a multiprogramming system was the British " Leo III " owned by J . Lyons and Co . During batch processing, several different programs were loaded in the computer memory, and the first one began to run.
48.
It is unclear whether the divisions among PCP, MFT and MVT arose because MVT required too much memory to be usable on mid-range machines or because IBM needed to release a multiprogramming version of OS ( MFT ) as soon as possible.
49.
It contained support for multiprogramming, multiple processors, 80 devices, job queues, printer queues, security, indexed file support, and fully installed, it was about 10MB . On the advanced / 36, the number of workstations / printers was increased to 160.
50.
PCP was a stop-gap version which could run only one program at a time, but MVT ( " Multiprogramming with a Variable number of Tasks " ) were used until at least the late 1970s, a good five years after their successors had been launched.
