Sega Mega Drive / Genesis Specs

Model Number: MK-1601 (r1), MK-1631 (r2).
CPU: Motorola 68000 at 7.61 MHz
1 MByte (8 Mbit) ROM Area
64 KByte RAM Area
Co-Processor: Z80 @ 4 MHz
(Not Present in MK-1631)
Controls PSG & FM Chips
8 KBytes of dedicated Sound Ram
64 simultaneous colors of 512 color pallete.
Pixel resolution: 320 x 224
VDP (Video Display Processor)
Dedicated video display processor
Controls playfield & sprites
64 KBytes of dedicated VRAM (Video Ram)
64 x 9-bits of CRAM (Color RAM)
3 Planes:
2 scrolling playfields, 1 sprite plane
PSG (TI 76489 chip)
FM chip (Yamaha YM 2612)
6-channel stereo
8 KBytes RAM
Signal/Noise Ratio: 14dB

Sega Genesis Add-on 32X Specs

Model Number: MK-84000 or MK-84000a.
CPU: Dual Hitachi SH-2 RISC Processors
@ 23 MHz each, 40MIPS.
Genesis 68000, and Z80
Genesis 32X VDP
32,768 simultaneous colours on screen
Genesis resolution
Overlaying over existing
Genesis/SegaCD video
50,000 texture-mapped polygons/sec
Texture mapping
Hardware scaling and rotation
Stereo PCM chip
Audio mixing with Genesis sound
Additional 2 channels
(8 Channels total, or 16 with SegaCD)

Release Dates

Mega Drive:

Japan on October 29, 1988

Europe on November 30, 1990


North America on August 14, 1989


North America on November 21, 1994

Japan on December 3, 1994

Europe in January 1995
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