UCSD p_System version IV is a commercial version, developed and sold by SofTech Microsystems. Based on Version II, it did not include many changes from Version III. Not a commercial sucess due to combination of their pricing structure, performance problems due to p-code interpreter, and competition with native operating systems (on top of which it often ran). Latest release was IV.2.1 R3.3 November 1984
After SofTech dropped the product and SMS stopped, it was picked up by Pecan Systems, a relatively small company formed of p-System users and fans. Sales revived somewhat, due mostly to Pecan’s reasonable pricing structure, but the p-System and UCSD Pascal gradually lost the market to native operating systems and compilers.
Softech (and Pecan) made many contributions to the p-System to make it more attractive: more programming languages, less restrictions, native code compilation, better documentation, widespread OEM sales (inlcuding HP, DEC, IBM, Texas Instruments, Heathkit etc) see the IV manuals below and the other UCSD pages for examples.
(restricted to Softech SMS documents, see the other UCSD pages for many more manuals that originated from Softech with a cover by the OEM company).
Softech Microsystems UCSD p-System for the Apple II Computer (ver_4.0) March 1983
Disk images Apple II p-System IV
UCSD p-System II.0 IMD disk images
UCSD p-System IV IMD disk images
Sources disk images IV VOL files (Ciderpress readable)
Knowledge Software Port-kit via C compiler bootstrap
Pecan UCSD compiler sources on Compuserve
Source IV.13 compiler
UCSD for MAC IV images
Corvus disk images