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Technical Specs

Model Number:  

MK-1601 (r1), MK-1631 (r2), MK-1641 (r3)


Motorola 68000 at 7.61 MHz


1 MByte (8 Mbit)


64 KByte


Z80 @ 4 MHz (Not Present in MK-1631)
controls PSG (Programmable Sound Generator) & FM Chips

Sound RAM:  

8 KBytes

Colors Available:  


Colors on screen:  


Pixel Resolution:  

320 x 224


VDP (Video Display Processor) dedicated video display processor, controls playfield & sprites.
3 Planes, 2 scrolling playfields, 1 sprite plane


64 KBytes (Video Ram)


64 x 9-bits (Color RAM)


PSG (TI 76489 chip)
FM chip (Yamaha YM 2612)
6-channel stereo
8 KBytes RAM Signal/Noise Ratio: 14dB

System Notes/History

The 3rd in the series, named the Genesis 3, was released by Majesco, not SEGA. Although it was under permission of SOA, that model is MK-1641, the MK 1601 is the original, and the MK 1631 is the second of the series.

The Genesis 3 does not have the Z80 processor, and that means the following:
1. Unable to run the MS convertor as it needs the Z80 chip which is the brain of the SMS.
2. Unable to run Game Genie, the Z80 must have played a role in the use of this for code break ins.
3. Unable to run special games such as Sega's Virtua Racing, which again uses the Z80.

The obvious disability of the Genesis 3 is the missing expansion port that used the purpose of running the SegaCD system. These factors should be taken in consideration if anyone is looking to buy a Genesis system. -- Contributed by Nestor J. Galeano

Related Links
Sega Genesis Gamepics
Sega Genesis Scans