A schematic diagram for the interrupt pin input circuitry.

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1. Ken Shirriff (kenshirriff@oldbytes.space)'s status on Wednesday, 22-Feb-2023 16:11:38 JST Ken Shirriff

   in reply to

   The external interrupt pins each have a circuit to clean up the interrupt signal and synchronize it to the 8086's clock. An input protection diode, inverters, and a two-stage latch. "Superbuffers" built from two transistors provide more current than regular NMOS buffers.