Cyclone IV FPGA 16MB of PSRAM memory High quality 6-layer PCB with hard gold surface finish Built-in CD-ROM² core* Arcade card functions In-game menu Multi slot save states Ten no Koe 2 saves support Cheats Custom menu themes Switchless region auto detection Built-in firmware installer USB port for development * The built-in CD-ROM² core does not work if a CD-ROM or Ten no Koe 2 is connected to the console's external expansion port, or if the console has a built-in CD-ROM. For this reason, the cartridge cannot run CD games on Duo systems. Due the mixing circuit specifics CD and hucart audio doesn't work via RF output