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(You may as well want to take a look at the manual, like p.2-5 of the September 1975 Manual) During the execution of an IN or OUT instruction [..], how does the Intel 8080 react to its READY pin going down? Operation is the same for all M cycles, independent of memory or I/O, as seen here: (Taken from p.2-8 of the 8080 Micro Computer Systems User's Manual ...

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