This program is part of Netpbm.
pbmtogo reads a PBM image as input and produces 2D compressed GraphOn graphics as output.
Be sure to set up your GraphOn with the following modes: 8 bits / no parity; obeys no XON/XOFF; NULs are accepted. These are all on the Comm menu. Also, remember to turn off tty post processing. Note that there is no gotopbm tool.