Family Computer Disk System

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The Family Computer Disk System was an add-on for the Family Computer, released only in Japan. Games for this system were released on distinctive yellow floppy disks. Or sometimes blue.

Probably the most recognizable element, partly through its cameos in Paper Mario: The Thousand-Year Door and Tetris DS, is the "PLEASE SET DISK CARD" screen. While waiting for the player to insert a disk, Mario and Luigi (using slightly altered versions of their Mario Bros. sprites) change the color scheme and chase each other around.

RAM Check


If you hold Start + Select during the boot screen and press Reset, a RAM check screen will appear. If no problems are detected, it will display "PRAM CRAM OK". If an error occurs, the address of the first memory cell where the error was detected will be displayed.

Programmer's Credit


Use the RAM Check code above, but before the text appears on-screen release Start + Select then hold Right + A to see the programmer credit of Takao Sawano. This works on both the standalone unit and Sharp's Twin Famicom all-in-one unit, the latter of which otherwise makes no reference to Nintendo.

Revision Differences
Two versions of the FDS BIOS exist, with only one known change: namely, the one used on the standalone unit displays the Nintendo logo whereas the Twin Famicom uses a generic "Famicom" logo, as Sharp removed most Nintendo branding.