Sorry about that; I guess it could be clearer.
1) The G100 and G101 are functionally identical. That means the same program run on either one will give exactly the same results.
1a) The G101 is an OEM version. It has no indicator LEDs, no terminal blocks for connections (headers only) and no enclosure or case. It really requires a user to design a printed circuit board the G101 can plug into.
1b) The G100 is an end-user version. It is also more expensive because the "gingerbread" listed in (1a) costs money.
2) The G100/G101 is an 8-bit perephrial (8-bit data bus, RD, WR, CE, 4-bit address bus, etc). It requires an 8-bit microcomputer to operate it. The interface connector is pinned-out for a Rabbit RCM3600 or RCM3700 series MCU though any other CPU can be used.
The Rabbit must be flashed with the firmware here (Geckodrive) unless you have a Rabbit development system and the required programming cable. We flash the Rabbit and sell it at cost with the G100/G101.
Mariss