Atari System 2 © 1985 Atari Corp.
PCB: A042571 ATARI SYSTEM II CPU.
Main CPU: DEC T11 @ 10 MHz (DEC 21-17311-02).
Sound CPU: MOS Technology M6502 2.2 MHz .
Sound Chips: Yamaha YM2151 @ 3.579545 MHz, 2 x POKEY (Pot Keyboard Integrated Circuit) @ 1.789772 MHz, Texas Instruments TMS5220 @ 625 KHz.
Oscillators: 14.31818 & 20.000.
VLSI: 645 V D727B, VGC7205-0672, 137304-2002 [40pin DIP, row 7].
Other Chips: 8645 137430-001 [40pin DIP, row 6/row 7].
Video Resoution: 512 x 384 Pixels.
Screen Refresh: 60.096154 Hz.
Palette Colors: 256.
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