This does not put out GPS records directly, instead it calls MC/PLOT
library routines.  For this reason gpspen only compiles and runs on
the Masscomp as it links with several of their libraries.

On the Masscomp you have to issue the   universe ucb   command in
order for this to compile and run correctly.

Don't know how to erase a GPS window.  GPS doesn't appear to have
this notion.

There's no GPS notion of area fill, and this is painfully slow with vector draws.

Color is a real hash here.  I need to build a crpf.config
ascii file with all sorts of junk in it to make this work well.
For now you can rely on the standard colors 0 to 7 (though 0
may not erase).

The mcd command can give you a softcopy preview but the colors won't match
the ones you asked for. Different defaults than the crpf command.

The Masscomp truncates filenames to 16 characters!  Ouch Ouch Ouch!
This wreaks havoc in loclib, with getpar_string_store.c and getpar_decode.c
and anything that calls it.  Also several of the test files and I don't
remember what else.  (Oh yes, include/font_definition.h)

You need to install vplot.h in one of the standard include libraries before
attempting to make any pen filter, including gpspen.

You may need to fix up the location of the vplot text fonts in include/param.h
I did at least.  You also need to fix up filters/machdep.  The link library
list for MC/PLOT is as long as your arm!

A good color scheme for a graphics tube may look bad on hardcopy because
the background is white, not black.  Watch out for yellow, especially.

The aspect ratio will need some work.  The mcd previews generally fill
the screen, or at least large portions of it, but the color hardcopy
is covering only about half the sheet.

Setting ppi=300 does significantly speed up the plotting, but the lines
come out awfully thin.  (The overall plot stays the same height and width.)

	- Stew Levin
