The command-line tool allows to upload your 6809-binaries to a Vectrex game console provided that you got the VecMulti card by Richard Hutchison.
Usage: vecmultiupload DEVICE BINARY
Example: ./vecmultiupload /dev/ttyUSB0 demo.bin
The vectrex test rom demo.bin is included. You are free to use the few lines of code for any purpose may it be private or commercial.