UCAPP2.PAS contains UCSD Pascal Kermit for the Apple II with the p-System.
UCAPP2.DOC has documentation.  The last section of the documentation refers
to the source (.TEXT) files by name.  These are concatenated together into
UCAPP2.PAS, with each file preceded by a comment of the form

(*=== name ===*)

where "name" is the p-System file name.
