The Vectrex overlays in this archive where created by Walt Garey,
Alcott B Smith and C Cole Baronvr

I just converted the PCX versions from the DOS Vectrex Emulator (DVE)
to PNG with netpbm and pnmtopng. These utilities are very common under
Unix. A precompiled version for win32 can be found at

ftp://ftp.gwdg.de/pub/.SI1/dante/systems/win32/web2c/netpbm-1.1-win32.zip

and in other TeX archives.

The procedure (Unix XV specific, but any paint program should work)
is:

Load game4.pcx into XV -> auto crop -> save as game.ppm (PBM/PGM/PPM
raw, full color). Open the XV color editor and change the palette into
gray levels representing the transparency of the corresponding colors
(0 = full transparency 255 = no transparency). Save this as game.pgm
(PBM/PGM/PPM raw, greyscale). Convert the two files into a PNG:

pnmtopng -alpha game.pgm game.ppm > game.png

Example PPM/PGM for minestorm are in the archive.

Some of the overlays don't scale down very well (most notable in
Minestorm). If you want to use a different resolution overlay from
DVE, you can convert them by yourself with the utilities mentioned
above.

Mathis Rosenhauer
