This cartridge allows you to program the G7000 in pseudo-Assembler language. It came packaged with a thick, spiral-bound manual that introduces programming concepts and provides some samples.
There are two versions of this cartridge. One is identical to the American release and was manufactured in the United States. The other was manufactured in France and has some slight differences. In particular, one of the undocumented instructions shown below does not function in the French-manufactured cartridges.