This program is part of Netpbm.
pbmto10x reads a PBM image as input and produces a file of Gemini 10X printer graphics as output. The 10x's printer codes are alleged to be similar to the Epson codes.
Note that there is no 10xtopbm tool - this transformation is one way.
The resolution is normally 60H by 72V. If you specify the -h option, resolution is 120H by 144V. You may find it useful to rotate landscape images before printing.