Japan-only Famicom add-on
The 1986 Disk System added rewritable disks and an extra sound channel to the Famicom, and it is where The Legend of Zelda, Metroid and Castlevania first appeared. It never left Japan.
Full-speed on all R36 models. Requires the FDS BIOS, and multi-side games prompt you to swap disk sides mid-play, exactly as the original did.
The chip is the same in every model, so the rating is too. What differs is the screen: 4:3 panels suit most home consoles, the 1:1 square panel suits Game Boy and GBA and shows 4:3 games with bars.
The R36 handheld family runs Famicom Disk System titles with perfect compatibility out of the box.