High Quality Content by WIKIPEDIA articles! The Apple II line of computers supported a number of Apple II peripheral cards, expansion cards which plugged into slots on the motherboard, and added to and extended the functionality of the base system. All Apple II models except the Apple IIc had at least seven 50-pin expansion slots, labeled Slots 1 though 7. These slots could hold printed circuit board cards with double-sided edge connectors, 25 "fingers" on each side, with 100 mil (0.1 inch) spacing between centers. Perhaps the most common cards found on early Apple II systems were the Disk II Controller Card, which allowed users of earlier Apple II's to use the Apple Disk II, a 5 1/4 inch, 140 kB floppy disk drive; and the Apple 16K Language Card, which increased the base memory of late-model Apple II and standard Apple II Plus units from 48 kB to 64 kB. Both Apple, and dozens of third-party vendors created hundreds of cards for the Apple II series of computers. These expansion slots afforded great opportunities for expansion.

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