Extensive use of DiodesDiodes Logic (some times regarded as "Micky-Mouse Logic") has been employed along history since first generation of computers (1940s). The following diagram illustrates a typical use: keyboard encoder. This circuit encodes the "Data Select" buttons of the CPU Console.
The image below illustrates another use of diodes in the CPU. As same control signals are generated in different Controller boards, a "Control Bus" (C-BUS) was employed to convey those. Then a wired-OR (actually built with diodes) was used to provide an inexpensive "distributed OR gate".
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