P-SYSTEM

For the computer p-System, see UCSD p-System. A P system is a computing model that abstracts from the way in which chemicals in a living cell interact and cross membranes.
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UCSD p-System or UCSD Pascal System was a portable, highly machine independent operating system based upon UCSD Pascal. The University of California, San Diego Institute for Information Systems developed it in 1978 to provide students with a common operating system that could run on any of the then available microcomputers as well as campus DEC PDP-11 minicomputers. UCSD p-System (Version IV, supplied by SofTech) was one of three operating systems (along with PC-DOS and CP/M-86) that IBM offered for its original IBM PC; but the p-System never sold very well for the IBM PC, mainly because of a lack of applications and because it was more expensive than the other choices. Before that, IBM used the UCSD p-System as the operating system for its Displaywriter, a microcomputer-based dedicated word processing machine (not to be confused with IBM's DisplayWrite word processing software).
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