The computer converts the binary digital signal into a composite binary digital signal (adding instructions such as allocation, check and stack) and reads it into the USB chip adapter interface. The chip processing signal is distributed to the corresponding address of EPROM2 memory chip to store binary data, thus realizing data storage. The control principle of EPROM2 data storage is that the voltage controls the voltage of the gate transistor, and the junction capacitance of the gate transistor can store the voltage value for a long time, which is why USB can store data after power failure. Can only be explained in such a simple and popular way.

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