We are aware of a product that allows viewing full PostScript files is
LaserTalk from Emerald City Software.
LaserTalk is an integrated PostScript development environment for the
Macintosh. Features include: interactive access to the PostScript executive,
real-time display of PostScript stacks and variables, on-screen viewing of
PostScript images, integrated editor/debugger without the 32K limit, program
tracing and breakpoints, dictionary browser, and on-line access to
Addison-Wesley's "PostScript Language Reference Manual."
For more details, search the Technical Info library under "Emerald City
Software."