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U1-14 and U2-1 when off, more like 1M ohms when off - Single Step - 12V through 10k Ohms to U-1-14, more like 1M when off - Glide attenuator (B10k) (join two left pins from below - Glide, manual (A100k) (two left pins, from below) - Clock in socket with 80 contacts AT ISA 16 bits Bus Edge Connector.

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