The NES NROM PCB allows you to burn your own NROM compatible games. These PCBs fit inside standard NES cartridge shells. The CHR and PRG both accept W27C512 type EPROMS. To burn the EPROMS, you will need an EPROM burner and an application to split NES ROMS (which you obtained legally) into separate CHR and PRG binary files. A solderable jumper pad allows you to select horizontal or vertical mirroring. The CIC is AVRCIC running on ATTINY13A.