This directory contains various flavors of PTDEFS and NPTDEFS.

PTDOS assembly programs would typically include either PTDEFS
or NPTDEFS to pick up the symbolic names of the various system
routines and constants.

Rather than trying to pick "the best" one, I've just included
all the ones I found amongst the source disks I have had access
to, tagging each file with the identity of the disk where the
particular file came from.

Note that there are PTDOS 1.4 as well as PTDOS 1.5 defines here.