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To handle weaker (<6v) signals - Clock In - U1-13 (can get at from top when assembled - Stop Switch - 10 ohms between U1-14 and U2-1 when off, more like 1M when off Glide In - diode to U2-3 Glide In - diode to U2-3 - Clock in socket with 80 contacts (40 each side), through-hole, http://www.4uconnector.com/online/object/4udrawing/10156.pdf 4UCON 10156 Card edge socket with 80 contacts AT ISA 16 bits Bus Edge Connector BUS ISA.

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