This update of the original Mega Drive was released in 1989.  There were several changes in this version including the removal of the slide volume adjuster, the headphone jack, the 9-pin EXT port and the RF out port.  The unit is in a smaller, lighter and slicker casing and the Power button has changed from a slide switch to a push switch.

Technical Specs:

CPU: 16-bit Motorolla 68000 (7.68MHz)
RAM: 64KB
Graphics: Dedicated graphics processor
Colors: 512 (64 on screen)
Sprites: 80
Resolution: 320x224 pixels
Sound: 6 channel stereo.  TI 76489 PSG, Yamaha YM 2612 FM chips

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