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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
Graphics:
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
Sound:
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.
Co-Processors:
Genesis 68000, and Z80
Genesis 32X VDP
Graphics:
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
Sound:
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

Genesis:

North America on August 14, 1989

32X:

North America on November 21, 1994

Japan on December 3, 1994

Europe in January 1995
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