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Sega Genesis

| Home | Click for large size. Technical Specs Model Number : MK-1601 (r1), MK-1631 (r2), MK-1641 (r3) CPU : Motorola 68000 at 7.61 MHz ROM : 1 MByte (8 Mbit) RAM : 64 KByte Co-processor : Z80 @ 4 MHz (Not Present in MK-1631) controls PSG (Programmable Sound Generator) & FM Chips Sound RAM : 8 KBytes Colors Available : 512 Colors on screen : 64 Pixel Resolution : 320 x 224 Graphics : VDP (Video Display Processor) dedicated video display processor, controls playfield & sprites. 3 Planes, 2 scrolling playfields, 1 sprite plane VRAM : 64 KBytes (Video Ram) CRAM : 64 x 9-bits (Color RAM) Sound : 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