Scarce Apple IIGS prototype logic board, labeled "SKA321-03" below a section of RAM, also marked on the edge with the part number and a copyright date of 1986, and hand-labeled "134L" at lower right. Also marked with a prototype serial number, "6XX-XXXX-," along the upper right edge. The board has a hand-wired jumper patch from a RAM chip to a NOR gate. The fifth and most powerful of the Apple II family, the Apple IIGS was released on September 15, 1986.
