UCSD Pascal
UCSD Pascal was a specific implementation of the programming language Pascal which used the p-Code machine architecture.
Notable was the introduction of separately compilable Units and a String type. Both of which influenced the design of the language Ada programming language.
The UCSD Pascal compiler was distributed as part of a portable operating system, the p-System.
There were four versions of UCSD p-Code engine (p-Code incompatible) each with several revisions of the p-System (and UCSD Pascal); represented with the leading Roman Numeral; operating system revisions were enumerated as the "dot" number following the p-Code Roman Numeral. vis: II.3 represented the third revision of the p-System running on the second revision of the p-Machine.
- Original version, never officially distributed outside of the University of California, San Diego. However the Pascal sources for both Versions I.3 and I.5 were freely exchanged between interested users. Specifically the patch revision I.5a was known to be one of the most stable.
- Widely distributed, available on many early microcomputers.
- Custom version written for Western Digital to run on their
