The Apple II Revision 0 (Part No. 820-0001-00) is the first production motherboard designed for the Apple II personal computer by Steve Wozniak in 1977. Produced in a limited run of approximately 6,000 units, the board is highly regarded in computing history for its minimalist, single-board design. It integrated central processing, color graphics, sound, memory, and expansion slots onto a single four-layer printed circuit board (PCB) without a dedicated video card.