Here is a couple of schematic diagrams for Apple II interface cards:

Exp80Col.gif	80 column card with 64k (for //E, Chop-Suey clone)
LCard.gif	Microsoft 16k card (with leds)
Printer.gif	Printer interface (AP4 style)
Softcard.gif	Microsoft Z80 softcard
Wildcard.gif	Wildcard clone


Patrick