- CPU: NEC 780C (clone of Zilog Z80)
- 3.579545 MHz for NTSC, 3.546893 MHz for PAL
- Main RAM: 16 kbit (2 kB)
- Video RAM: 128 kbit (16 kB)
- Video processor: Texas Instruments TMS9928A
- 256×192 resolution
- 32 sprites
- 16 colors
- Sound: Texas Instruments SN76489
- 4-channel mono sound
- 3 sound generators, 4 octaves each, 1 white noise generator
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- Ports:
- 1 ROM cartridge
- 1 DIN composite video/audio (SC-3000 only)
- 1 RF out
- 1-2 joystick (1 port for SG-1000, 2 for SG-1000 II and SC-3000)
- 1 expansion parallel bus (used for SK-1100 keyboard and FM Sound Unit; (SK-1100)SG-1000 and SG-1000 II and Sega MarkIII / (FM Sound Unit)Sega MarkIII only )
- 1 cassette (SC-3000 and SK-1100 keyboard)
- 1 printer (SC-3000 and SK-1100 keyboard)
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