Sega Net Work System
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The Sega Net Work System was a network service in Japan for people using the Sega Mega Drive. Debuting in 1990, this service worked with the Game Toshokan (literally Game Library) cartridge to download games on the console (meaning that the game will have to be re-downloaded each time).
However, the service was not very successful and was eventually discontinued. Plans for this service were considered in North America, with the device being renamed the Tele-Genesis, and was in fact advertised in several early product and accessory line-ups for the console, but these plans were also cancelled.  Players attached a MegaModem (modem, with a speed of 1,600 to 2,400 bit/s) to the "EXT" DE-9 port on the back of the Mega Drive, and used it to dial up other players to play games. There was a monthly fee of ¥800 
Later versions of the North American Genesis (with the Genesis logo printed in a single shade of gray and without the "High Definition Graphics" legend) and all units of the Genesis 2 omit the rear DE-9 connector altogether, though the provisions for it on the circuit board remained.
Among the available titles were: Phantasy Star II Text Adventures, Flicky, Fatal Labyrinth, Sonic Eraser (a Sonic the Hedgehog/Columns crossover puzzle game), Teddy Boy Blues, Penguin Land, and others.
 See also
- XBAND - A third-party online gaming service
- Sega Channel - Sega's network service in North America and Europe
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