UCSD p-System IV

The UCSD p-System is a highly portable operating system. It uses the Pascal programming language, and all applications are compiled to interpreted bytecode. This means an application written for the p-System should run on any p-System platform, regardless of the CPU and architecture. However, depending on the use, it could be quite slow.

A number of commercial applications were written for the UCSD p-System, but it lost its portability advantage as the industry standardized on the x86 IBM PC architecture.


Release notes

source is bitsavers: http://bitsavers.org/bits/IBM/PC/p-system

The Pascal compiler is from a different source, and might be an updated version. Also includes an alternate "SYSTEM2" disk.

Missing manual: "6936508 - UCSD Pascal Reference for the UCSD p-System"

Product type
SofTech Microsystems
Release date
User interface
Download count
13 (11 for release)


Download name Version Language Architecture File size Downloads
UCSD p-System IV for IBM PC (Release 1) (1982) (5.25-160k) IV for IBM PC (Release 1) English 709.89KB 5
UCSD p-System IV for IBM PC Manuals (1982) IV for IBM PC English 42.48MB 5
UCSD p-System IV for NEC APC (boot) (8-inch) IV for NEC APC (boot) English 382.93KB 0
UCSD p-System IV for TI Professional Computer Manuals (1983) IV for TIPC English 368.88MB 1


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