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An interrupt pin of a CPU will always be an Input. After all, it's whole purpose is to tell the CPU about an interrupt pending. Wouldn't work if it's an output, would it?


The W65C02 data sheet does explain it (p. 9): 3.4 Interrupt Request (IRQB) The Interrupt Request (IRQB) input signal is used to request that an interrupt sequence be initiated. The program counter (PC) and Processor Status Register (P) are pushed onto the stack and the IRQB disable (I) flag is set to a "1" disabling further interrupts before ...


The interrupt pin is an input.

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