The original Display PostScript Software from Adobe is available as part
of the X11R6 release or on the FTP server ftp.adobe.com

   pub/adobe/misc/programs/DPS.R6.contrib.tar.Z

Appendix A and B from the book ``Programming the Display PostScript
System with X', describing the PSres library and the makepsres utility,
is available in

   pub/adobe/DeveloperSupport/TechNotes/PSfiles/DPS.refmanuals.TK.ps

--Piet
November 1995