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Family Computer Disk System
The , sometimes called the , the , the FDS and the FCD, was released on by Nintendo as a peripheral for the Nintendo Family Computer console in Japan. It uses proprietary floppy disks (called "Disk Cards") for data storage. It was announced, but not released, for the North American/PAL Nintendo Entertainment System. Through its entire production span, –, 4.44 million units were sold.
The device is connected to the Famicom deck by plugging a special cartridge known as the RAM Adapter into the system's cartridge port, and attaching that cartridge's cable to the disk drive. The RAM adapter contains 32 kilobytes (KB) of RAM for temporary program storage, 8 KB of RAM for tile and sprite data storage, and an ASIC known as the 2C33. The ASIC acts as a disk controller for the floppy drive, and also includes additional sound hardware featuring a single-cycle wavetable-lookup synthesizer. Finally, embedded in the 2C33 is an 8KB BIOS ROM. The Disk Cards used are double-sided, with a total capacity of 112 KB per disk. Many games span both sides of a disk, requiring the user to switch sides at some point during gameplay. A few games use two full disks, totaling four sides. The Disk System is capable of running on six C-cell batteries or the supplied AC adapter. Batteries usually last five months with daily game play. The battery option is due to the likelihood of a standard set of AC plugs already being occupied by a Famicom and a television.
==History==
In 1986, the disks' 112 KB of storage space was quite appealing due to the high cost of cartridge-based solid state storage chips. The rewritable aspect of the disks also opened up new possibilities; games such as ''The Legend of Zelda'', ''Metroid'', and ''Kid Icarus'' were released to the FDS with a save feature. Many of these titles were subsequently ported to cartridge format and released for the NES a year or two later, with saving implemented via password resume or battery-backed memory.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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