NES-TVROM

TVROM Board

Tech Specs:

Standard MMC3 board.
Max. 128K PRG ROM.
Max. 64K CHR ROM.
4K nametable RAM (8K RAM w/ A12 pulled low).

Description:

This is an MMC3 board that allows 4 screen mirroring. It is from the game Rad Racer ][. Gauntlet uses a similar board. These are the only two 4-screen mirrored games I know of.