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Details

ASIA
29/10/1988

AMERICA
14/08/1989

EUROPE
30/11/1990

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CPU: Motorola 68000 @ 7.67 MHz + Zilog Z80 @ 3.58 MHz 
(7.61 MHz and 3.55 MHz on PAL)
GFX: Yamaha YM7101
(modified Texas Instruments TMS9918A on later models)
SND:  Yamaha YM2612 @ 7.6 MHz
(Texas Instruments SN76489 clones on later American models)
MEM: 64 kB System / 64 kB Video / 8 kB Audio
RES: 256x224p, 320x224p or 320x448i 
(256x240p, 320x240p or 320x480i on PAL)
Learn more...

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Released as Mega Drive outside the US.
Some models had Motorola 68000 clones made by Hitachi and Signetics.
The Signetics 68K clone was known to be inefficient.
The Zilog Z80 was used to provide compatibility for Master System games.

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