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SG-1000 Logo.svg
Manufacturer Sega
Type Home video game console
Generation Third generation
Release date SG-1000
  • JP: July 15, 1983
SG-1000 II
  • JP: July 31, 1984
Discontinued SG-1000
  • JP: July 1984
SG-1000 II
  • JP: October 1985
Media ROM cartridge, cassette tape, Sega Card
CPU Zilog Z80 @ 3.58 MHz
Memory 1 kB RAM, 2 kB VRAM
Display 256 × 192 resolution, 16 colors, 32 on-screen sprites
Graphics Texas Instruments TMS9928A
Sound Texas Instruments SN76489
Successor Master System

The SG-1000,[a] also known as the Sega Computer Videogame SG-1000, is a cartridge-based home video game console manufactured by Sega and released in Japan, Australia, and other countries. It was Sega's first entry into the home video game hardware business, and provided the basis for the more successful Master System. Introduced in 1983, the SG-1000 was released on the same day that Nintendo released the Family Computer (Famicom for short) in Japan. The SG-1000 was released in several forms, including the SC-3000 computer and the redesigned SG-1000 II,[b] also known as the Mark II, released in 1984.

Developed in response to a downturn in arcades in 1982, the SG-1000 was created on the advice of Hayao Nakayama, president of Sega Enterprises, Ltd. Shortly after the release, Sega Enterprises was sold to CSK Corporation, which was followed by the release of the SG-1000 II. Due to the release of the Famicom, and the number of consoles present in the market at the time, the SG-1000 was not commercially successful.


SG-1000 with joystick
SG-1000 II
Sega Mark III
SG-1000 II
Sega Mark III

In the early 1980s, Sega Enterprises, Inc., then a subsidiary of Gulf and Western, was one of the top five arcade game manufacturers active in the United States, as company revenues rose to $214 million.[1] A downturn in the arcade business starting in 1982 seriously hurt the company, leading Gulf & Western to sell its North American arcade manufacturing organization and the licensing rights for its arcade games to Bally Manufacturing.[2][3] The company retained Sega's North American R&D operation, as well as its Japanese subsidiary, Sega Enterprises, Ltd. With its arcade business in decline, Gulf & Western executives turned to Sega Enterprises, Ltd.'s president, Hayao Nakayama, for advice on how to proceed. Nakayama advocated that the company leverage its hardware expertise gained through years working in the arcade industry to move into the home console market in Japan, which was in its infancy at the time.[4] Nakayama received permission to proceed, leading to the release of Sega's first home video game system, the SG-1000.[5]

To keep costs down while ensuring sufficient longevity, Sega opted to create the platform from popular off-the-shelf components.[6] The first model to be developed was actually the SC-3000, a computer version with a built-in keyboard, but when Sega learned of Nintendo's plans to release a games-only console, they began developing the SG-1000 alongside the SC-3000.[6]

The SG-1000 was first released in Japan on July 15, 1983, at JP¥15,000.[7] It was released on the same day as Nintendo launched the Family Computer (Famicom) in Japan.[5] It was released simultaneously with the SC-3000,[8][5][7] also known as the Sega Personal Computer SC-3000,[9] as well as the upgraded SC-3000H.[10] The SG-1000 was released in Australia through John Sands Electronics,[5] and in Italy, Spain, and other countries.[11] An unauthorized clone system known as the Telegames Personal Arcade was produced, and is able to play SG-1000 and ColecoVision games.[5]

The SG-1000's launch did not prove to be successful.[11] The three launch games, all of which were ported from Sega's VIC dual-arcade board, lacked the name recognition of Famicom launch games Donkey Kong, Donkey Kong Jr., and Popeye.[6] However, the situation was quickly turned around. Thanks in part to the SG-1000's steadier stream of releases (21 SG-1000 games by the end of 1983, as compared to only 9 Famicom games), and in part to a recall on Famicom units necessitated by a faulty circuit, the SG-1000 chalked up 160,000 units in sales in 1983, far exceeding Sega's projection of 50,000 units.[6]

Shortly after launch, Gulf & Western began to divest itself of its non-core businesses after the death of company founder Charles Bluhdorn,[12] so Nakayama and former Sega CEO David Rosen arranged a management buyout of the Japanese subsidiary in 1984 with financial backing from CSK Corporation, a prominent Japanese software company. Nakayama was then installed as CEO of the new Sega Enterprises, Ltd.[13]

Following the buyout, Sega released another console, the SG-1000 II, on July 31, 1984[8][11] at ¥15,000.[14] It featured hardware tweaks from the original model, including detachable controllers[5] and the ability to play Sega Card games.[11] The lead designer of consumer hardware development at Sega, Hideki Sato, disliked the original cartridges, saying they looked like "small black tombstones" when inserted in the console, and later remarked that his proudest achievement of the SG-1000 era was replacing them with the cheerier, pocket-sized Sega Cards.[6] Sega also employed popular comedy duo Tunnels to provide celebrity endorsement for the console.[6]

Despite this, the console war turned back in the Famicom's favor during 1984. The Famicom had more advanced hardware, allowing it to perform smoother scrolling and more colorful sprites, and Nintendo boosted its games library by courting third-party developers, whereas Sega was less than eager to collaborate with the same companies they were competing with in arcades.[6] The SG-1000 was also coming up against game consoles from companies including Tomy and Bandai.[5] This would result in the release of the Sega Mark III in Japan in 1985, which later became the Master System worldwide.[11] The last cartridge released was Portrait of Loretta on February 18, 1987.[15] In 2006, the GameTap subscription gaming service added an emulator of the SG-1000, and several playable titles.[16]

Though Sega themselves only released the SG-1000 in Japan, rebranded versions were released in New Zealand by Grandstand Leisure and in Taiwan by Aaronix.[6] The console enjoyed a brief period of popularity in Taiwan before the market was taken over by cheaper Famicom clones.[17]

Technical specifications[edit]

TMS9928A video display processor, as used in the SG-1000

The SG-1000 is powered by an 8-bit Zilog Z80 central processing unit running at 3.58 MHz for the SG-1000 and SG-1000 II,[18][19] and at 4 MHz for the SC-3000.[20] Its video processor is a Texas Instruments TMS9928A, capable of displaying up to 16 colors, and its sound processor is a Texas Instruments SN76489. All three chips were used in the ColecoVision.[5] The system includes 8 kbit (1 kB) of random access memory (RAM) and 16 kbit (2 kB) of video RAM.[18] The controller is hardwired to the system in the original model, and detachable in the SG-1000 II. Video and audio output are supplied through an RF switch.[5] Power is supplied through a 9V DC connector connected to an AC adapter.[18][19][20]

Several peripherals exist for the SG-1000 series. Available at ¥13,800 at its time of release, the SK-1100 keyboard connects through the expansion slot and is compatible with all models.[21] Multiple controllers were created, including the SJ-200 joystick attached to the SG-1000, and the SJ-150 joypad, made for use with the SG-1000 II. A racing wheel known as the SH-400 was made for use with games such as Monaco GP.[22] The C-1000 Card Catcher, sold at ¥1,000, allowing players to play Sega Card titles.[23] Additional accessories existed solely for use with the SC-3000, including the SR-1000 cassette deck,[24] the SP-400 4-color plotter printer,[25] and the SF-7000 expansion device which adds a floppy disk drive and additional memory.[26]

Game library[edit]

Monaco GP SG-1000 game cartridge
Girl's Garden, a game for the SG-1000 developed by Yuji Naka

The SG-1000's game library comprises 68 standard cartridge releases and 29 Sega Card releases. All games play on each model, although 26 cartridge releases require the keyboard accessory or the SC-3000.[15] All titles are fully compatible with the Mark III and Master System. Titles for the system include Flicky, Congo Bongo, Sega-Galaga, and Girl's Garden, the first video game directed by Sonic the Hedgehog creator Yuji Naka. The library included licensed titles, such as Golgo 13. Packaging and game manuals came with both Japanese and English text until 1984, when manuals were switched to Japanese only and the size of the cartridge box was reduced.[5]

Comparisons have been made of the appearance of SG-1000 games to those released for the ColecoVision, and the graphics have been criticized in light of the simultaneous release of the Famicom. The controls have been criticized for lack of responsiveness; writing for Wired, reviewer Chris Kohler says of Flicky, "the jumping control is so terrible that getting back up to the exit is insanely difficult."[5]

Reception and legacy[edit]

The SG-1000 made little impact on the video game industry. Retro Gamer writer Damien McFerran said it was an "abject failure", but called it and the SG-1000 II "the Japanese forefathers of the Master System".[11] Writing for Wired, Chris Kohler criticized the poor response of the controller's joystick and the lack of an RCA output. He said the release timing hurt its success; "[al]though its graphics were of better quality than most consoles on the market, it had the bad luck to be released in the same month as Nintendo’s world-changing Famicom, which had killer apps like Donkey Kong and could run circles around Sega’s hardware."[5] Of its legacy, Kohler said, "Few have heard of it, even fewer have played it, and the games weren’t that great anyway."[5]

See also[edit]


  1. ^ SG-1000 (エスジー・セン, Esu Jī Sen)
  2. ^ SG-1000 II (エスジー・セン・ツー, Esu Jī Sen Tsū)


  1. ^ Brandt, Richard; Gross, Neil (February 1994). "Sega!". Businessweek. Retrieved October 10, 2013. 
  2. ^ Pollack, Andrew (October 24, 1982). "What's New In Video Games; Taking the Zing Out of the Arcade Boom". New York Times. Retrieved November 27, 2013. 
  3. ^ "The Bottom Line". Miami Herald  – via NewsBank (subscription required). August 27, 1983. Retrieved October 10, 2013. 
  4. ^ Battelle, John (December 1993). "The Next Level: Sega's Plans for World Domination". Wired. Condé Nast Publications. Retrieved October 9, 2013. 
  5. ^ a b c d e f g h i j k l m Kohler, Chris (October 2009). "Playing the SG-1000, Sega's First Game Machine". Wired Magazine's online site. Retrieved October 5, 2009. 
  6. ^ a b c d e f g h Marley, Scott (December 2016). "SG-1000". Retro Gamer. No. 163. Future Publishing. pp. 56–61. 
  7. ^ a b "SG-1000" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  8. ^ a b Gamer's High! Futabasha Super Mook (in Japanese). Futabasha. 2015. p. 54. ISBN 978-4-575-45554-0. 
  9. ^ "SC-3000" (in Japanese). Sega Corporation. Retrieved February 15, 2013. 
  10. ^ "SC-3000H" (in Japanese). Sega Corporation. Retrieved February 15, 2013. 
  11. ^ a b c d e f McFerran, Damien. "Retroinspection: Master System". Retro Gamer. Imagine Publishing (44): 48–53. 
  12. ^ "G&W Wins Cheers $1 Billion Spinoff Set". Miami Herald  – via NewsBank (subscription required). August 16, 1983. Retrieved October 10, 2013. 
  13. ^ Kent, Steven L. (2001). "The Birth of Sega". The Ultimate History of Video Games: The Story Behind the Craze that Touched our Lives and Changed the World. Roseville, California: Prima Publishing. p. 343. ISBN 0-7615-3643-4. 
  14. ^ "SG-1000 II" (in Japanese). Sega Corporation. Retrieved February 15, 2013. 
  15. ^ a b "SG-1000" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  16. ^ "GameTap Celebrates Sonic's 15th Anniversary With Rare Content From Import-Only Console, Lock-On Genesis Games, And New TV-On-The-Web Programming". GamesIndustry International. June 23, 2006. Retrieved February 27, 2014. 
  17. ^ Marley, Scott (December 2016). "The Rare Jewels from Taiwan...". Retro Gamer. No. 163. Future Publishing. p. 61. 
  18. ^ a b c "SG-1000 Technical specifications" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  19. ^ a b "SG-1000 II Technical specifications" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  20. ^ a b "SC-3000 Technical specifications" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  21. ^ "SK-1100" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  22. ^ "SG-1000 controllers" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  23. ^ "Card catcher" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  24. ^ "SR-1000" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  25. ^ "SP-400" (in Japanese). Sega Corporation. Retrieved February 12, 2014. 
  26. ^ "SF-7000" (in Japanese). Sega Corporation. Retrieved February 12, 2014.