This is an interesting example of a Tigervision prototype. Notice
how the case has been notched out to give the EPROM enough clearance?
This is due to the fact that the EPROMs are socketed and not soldered
(the sockets increase the height). The label on the EPROM says DMINER
which is most likely short for Demo Miner.
This cartridge was most likely a demonstration cart for reviewers as
it is the same final version with one major exception. This prototype
has a level select that was removed from the final version. Pressing
the reset button while a level is being shown during the opening introduction
will allow the player to start at that level (normally you are taken back
to the first level). This was probably done so the reviewer didn't
have to play through all the levels to reach the one he wanted.