A joypad circuit for playing PC games includes a switching circuit connected between a PC and a keyboard, a microprocessor connected to the switching circuit for blocking signals from the keyboard and controlling the operation of the PC, a memory connected to the microprocessor for storing data from the keyboard during a setting mode, a plurality of switches for a user to select a desired function, a button processing circuit connected to the microprocessor for selecting a plurality of data stored in the memory in response to the user's selection to the switches, a special control circuit for performing special control of the PC when the number of the switches is not enough to control the PC, and a mode selecting circuit connecting with the microprocessor for selecting a desired operation mode.
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