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SG-1000 modding wiki

Explore SG-1000 modding, repairs, homebrew, hardware upgrades, and technical references. Find a guide for your console and follow the steps.

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The Sega SG-1000 ("Sega Game 1000") is an 8-bit console from the third generation of video game consoles. It was Sega's first game console, launched in Japan on July 15, 1983 with later releases in New Zealand and Taiwan. Released alongside the SG-1000 was the SC-3000 ("Sega Computer 3000"), a home computer variant with a built-in keyboard and additional RAM that saw a release in Japan, Australasia and several European countries. A further revision, the SG-1000 II, was released in 1984 which updated the console's look. Although the SG-1000 was vastly overshadowed by Nintendo's Family Computer (released on the same day), it gave the company valuable experience in the home video game market and the console formed the basis for the vastly more successful Sega Master System.

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SG-1000SG-1000:Connector PinoutsCartridge Port This connector has 44 pins and has a pin pitch of 3.18 mm. Note: Pins A1 through A22 are towards the back and numbered …Updated Oct 9, 2026SG-1000SG-1000:Controller AdaptersOriginal SG-1000 The original SG-1000 featured a hardwired SJ-200 joystick, which has rather subpar construction and equally subpar er…Updated Oct 9, 2026SG-1000SG-1000:Creating Game BackupsMultiple options exist to create backups of your game ROMs for the SG-1000. Depending on what options and systems you need, some optio…Updated Oct 9, 2026SG-1000SG-1000:Homebrew Games ListBelow is a list of homebrew games and ports for the Sega SG-1000. This list was compiled from multiple lists and forum posts [1][2]. H…Updated Oct 9, 2026SG-1000SG-1000:List of Games With Keyboard CompatibilityAll SG-1000 games and even all Othello Multivision games can make use of the SC-3000's built-in keyboard or the optional SK-1100 keybo…Updated Oct 9, 2026SG-1000SG-1000:No PowerAlthough the SG-1000 is a fairly hardy console, there are several conditions which could cause the system not to power on. Fortunately…Updated Oct 9, 2026SG-1000SG-1000:Region InformationGiven that it was only largely sold in Japan with a very limited release in New Zealand and a semi-official release in Taiwan, the SG-…Updated Oct 9, 2026SG-1000SG-1000:SG-1000 Model DifferencesThere are two standalone SG-1000 models, two SC-3000 models, two "spinoff" models and a module designed for use in Pioneer's SEED rang…Updated Oct 9, 2026SG-1000SG-1000:Video Output NotesSG-1000 The original SG-1000 only features RF out, typical of the era. All Japanese SG-1000s feature a TMS9918 VDP, which outputs comp…Updated Oct 9, 2026