The UCSD p-System part of the site has been enhanced with all I had in my archive. This descendent of the P2 compiler, initiated by Ken Bowles and his students at UCSD, had a big impact around 1980 as a full operating system and with programming languages (Pascal, Fortran, Basic, Modual-2, Ada) in a well-supported portable way. A forerunner of Java, running on small computers like the Apple ][ and CP/M systems. The simple text based user interface and the p-code interpreter were strong points, but were later a disadvantage when native systems and compilers and GUI’s took over. Around 1985 the commercial impact was gone.
Many books, disk images etcetera.
The MS-DOS hosted p-system Supplement book has been scanned by me, the first time!