Abstract: A joy stick structure for video game comprises a pressing plate having a central socket integrally provided thereunder, a body having a central through hole, a plurality of first spaces and a second space, a stick having a first end with a sphere thereof and a second end firmly received within the central socket of the pressing plate through the central through hole of the body and a plurality of transmission mechanisms securely received within the first spaces of the body. A positioning boss is formed integrally on the sphere and received within the second space of the body preventing unrequired movement of the stick. The sphere of the stick provides a smooth sliding effect.

Abstract: 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.

Abstract: A programmable joypad circuit for playing PC games includes a panel having a plurality of control buttons, a directional button, a switching button, a mode selecting switch, a four/eight direction mode switch, a setting switch and a control circuit having a microprocessor, a memory, a switching circuit, and a parallel/serial conversion circuit. The microprocessor has a plurality of input and output pins respectively coupled with the control buttons, the directional button, the switching button, and mode selecting switch, and setting switch, a data input pin coupled to the PC, a clock pin coupled to the PC, a set pin coupled to said parallel/serial conversion circuit via the direction mode switch, the setting switch, and a control pin coupled to the switch circuit composed of a first transistor and a second transistor each having a collector and an emitter respectively connected to a corresponding data pin and clock pin of the microprocessor and a base connected to a control pin of the microprocessor.