Microcode for the INTR interrupt.

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1. Ken Shirriff (kenshirriff@oldbytes.space)'s status on Wednesday, 22-Feb-2023 16:11:48 JST Ken Shirriff

   in reply to

   The INTR pin triggers a complicated interrupt that runs INTA two bus cycles to acknowledge the interrupt (for historical reasons from the 8008 and 8080 processors). The interrupt bus cycle is similar to a memory read but gets an interrupt type value from the external device.