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Z80 CPU Z80 Logo
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Z80-Computer Circuit Diagram

Autonomous, that means, that the computer is running already by itself without any other components from outside, so that it has an input and an output and can control external devices. The machine code program for these basic functions is in the ROM and the computer has also a RAM-memory to store and process temporary data. But in the circuitry is not included a keyboard, display or a data-recorder, this must be joint, if desired, extra externally at the input- and output-lines. For the operation of these additional user elements must be an appropriate control-code in the ROM. That means that the programming of all code in the ROM of all what the computer should do, must be made first on another computer before it can run on this computer.