It's basically a program that displays a NetPBM/PBMPlus .pbm file on a hercules adapter. It was intended for Linux, and was written (and useful :) back before Linux had an X11 or MGR implementation on it yet.
Anyway, you can download it here
BTW, hercules pixels aren't square, so to get a decent aspect ratio:
seki-strombrg> cat pnmherc #!/bin/sh pnmscale -xscale 1.625 "$@" | \ pnmscale -xysize 720 348 | \ ppmtopgm | \ pgmtopbm
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