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Twin Famicom

The Twin Famicom (ツインファミコン Tsuinn Famikon) was produced by Sharp Corporation in 1986, and was only released in Japan. It is a licensed Nintendo product which combines the Family Computer (Famicom) and the Family Computer Disk System (FDS) into a single piece of hardware.


  • Overview 1
    • Specifications 1.1
  • Features 2
  • See also 3
  • References 4
  • External links 5


The basic parts of the Twin Famicom include a 60-pin slot for Famicom cartridges, a slot for Disk System's Disk Cards, a switch located right below the cartridge slot which allows the player to choose between "Cassette (カセット Kasetto)" or "Disk (ディスク Disuku)", the power button, reset button, and the eject buttons. FDS disks can be removed using the yellow button below the disk slot. The mechanism that it uses is similar to ones that are used in contemporary floppy disk drives. The eject button for cartridges is located between the power and reset buttons. It causes the cartridge to "pop" out of the slot, much like the way bread slices do when coming out of a pop-up toaster.

The system does not allow both slots to be used at the same time. The switch that changes the mode from disk to cartridge works in a manner in which choosing to use the cartridge slot will block the disk drive, and vice versa. However, in some systems, only the cartridge slot will be blocked, but it is impossible to change to cartridge mode while the disk is being read.


  • Main Processor: Ricoh 2A03 at 1.79 MHz
  • RAM: 2 KB work RAM, 2 KB video RAM, 32 KB work RAM in FDS mode, 8 KB video RAM in FDS mode
  • ROM: FDS BIOS and 60-pin "cassette" (cartridge) slot
  • Audio: Six voices; two pulse wave channels, one triangle channel, one noise channel, one PCM channel, one 6-bit wavetable channel.
  • Graphics: Ricoh 2C02; 256×240 pixels, 64 sprites, can display 25 colors out of 53


Red Twin Famicom variant

Like all other Famicom consoles, the Twin Famicom has a port that allows games like Moero TwinBee to support more than the usual two players and to which the matching version of the NES Zapper can be attached. There also is a second port of a slightly different shape for connecting another Famicom via the black RAM unit that comes with the standard Famicom Disk System. This allows a standalone Famicom to use the disk drive on the Twin Famicom.

Another unique trait of this console is its color. Whereas the original Famicom only came in one color combination, the Twin Famicom was initially sold in two colors: red with black highlights (AN-500R), and black with red highlights (AN-500B). A second version of the system was released in 1987 with a slightly different case design, turbo controllers, and two different color schemes; black with green highlights (AN-505-BK) and red with beige highlights (AN-505-RD).

Unlike the Famicom, which used an RF adapter, the Twin Famicom used RCA connectors for composite video and mono audio, allowing for greater audiovisual quality on TVs and monitors with such inputs. An external RF modulator was bundled with the unit for connection through a TV's antennna/cable input.

See also


  • Atari HQ
  • (for the specs)

External links

  • Video of Twin Famicom features from FamicomDojo.TV
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