- Super Game Module support (32kB RAM, AY-3-8910A; remaps BIOS in memory space?)
- ADAM support (64kB RAM, ???; different decode logic for CV vs. ADAM mode?)
- Built-in flashcart BIOS with menu
- Portable variant (rearranged board) with LCD
- Backplane variant for easier testing/isolation
- Sega Genesis controller support (3 button + start instead of numpad)
- RGB output (requires TMS-9928)