Difference between revisions of "SG-1000"

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|caption = Sega SG-1000
|caption = Sega SG-1000
|Manufacturer = [[SEGA]]
|Manufacturer = [[SEGA]]
|Generation = Third generation
|Generation = [http://retroconsoles.wikia.com/wiki/Category:Third_generation Third generation]
|Release date = July 15, 1983 (JP)
|Release date = July 15, 1983 (JP)
July 1984 (JP) SG-1000 II
July 1984 (JP) SG-1000 II

Revision as of 23:18, 25 July 2013

[[File:Sega SG-1000.jpg|230px]]
Manufacturer SEGA
Generation Third generation
Release date July 15, 1983 (JP)

July 1984 (JP) SG-1000 II

Media type ROM cartridge,

Cassette tape (SC-3000)

Successor Sega Master System

The SG-1000, which stands for Sega Game 1000, was a cartridge-based video game console manufactured by Sega. This system marked Sega's first entry into the home video game hardware business, and while the system was not popular, it provided the basis for it's more successful successor Sega Master System.

The SG-1000 is one of Taiwan's first and best-remembered consoles where it was manufactured and sold under license as "阿羅士" ['Lou Shi'].

Technical specifications

SG-1000 game cartridge
  • CPU: NEC 780C (clone of Zilog Z80) clocked at 3.579545 MHz for NTSC, 3.546893 MHz for PAL
  • Memory: 16 kbit (2 kB) RAM, 128 kbit (16 kB) VRAM
  • Storage capacity: SG-1000/SC-3000 ROM cartridge
  • Video: Texas Instruments TMS9928A (256×192 resolution, 16 colours, 32 on-screen sprites)
  • Sound: Texas Instruments SN76489 (4-channel mono sound; 3 sound generators, 4 octaves each, 1 white noise generator)
  • Ports:
    1. ROM cartridge
    2. DIN composite video/audio (SC-3000 only)
    3. RF out
    4. 1-2 controller (1 port for SG-1000, 2 for SG-1000 II and SC-3000)
    5. Expansion parallel bus used for SK-1100 keyboard and FM Sound Unit (The FM Sound Unit was compatible with the Sega Mark III only)
    6. cassette (SC-3000 and SK-1100 keyboard)
    7. printer (SC-3000 and SK-1100 keyboard)


SG-1000 II

Sega released an updated version (july 1984) with a re-styled shell and the connector for the optional plug-in SK-1100 keyboard has been moved from the rear to the front.
In Japan the console also had an optional game card reader add-on "Card Catcher" that allowed for the use of Sega game card software. Card based software was exclusive to Japan, only cartridge based games were released in Europe and Oceania. The card reader became built into the Sega Mark III, as well as the first version of the Sega Master System.


The SC-3000 (1983) was the computer equivalent of the SG-1000 and was marketed as a computer for begginers. Since games were compatible with both the SC-3000 and SG-1000, and since the SC-3000 was also able to run computer applications, it outsold the SG-1000.
Users were able to create their own programs and games on the machine in BASIC, as well as machine code. A speech synthesis unit, light pen, and several other third party accessories were also available.
The SC-3000 had an add-on called the SF-7000. The SF-7000 added 64KB of RAM and 8KB ROM, a 3-inch floppy disk drive, a parallel port, and an RS-232 serial port.
An upgraded version (SC-3000H) was released with more RAM and an upgraded keyboard (the original keyboard was of the low-end membrane type).

Sega Mark III

The Sega Mark III (model number SG-1000M3), was a newer version released only in Japan with improved video hardware and an increased amount of RAM, which was redesigned to become the Sega Master System.