Dead Test cartridge version 781220.   If you have a eprom burner, you can reprogram the Winbond W27C512 chip with different bin files.

When pandemic started I stayed at home.  I needed something to do to keep busy, so I practiced soldering by putting together various PCB projects I found on PCBWay and other places.  I have a lot of these projects both completed and some unfinished.  I'm trying to get rid of everything, so that is why I am selling.  I hope to recover some of the money I spent for the PCBs, the various parts and shipping.  I am not making any profit on these units as can be demonstrated by how much others are selling similar units.  

Message me if you have any questions.