| 摘要 |
A circuit providing a joystick interface to a computer. The circuit plugs into the cartridge slot of the computer and receives power from the computer. The circuit includes an analog interface circuit, a read only memory (ROM) containing both a machine language program to drive the analog interface circuit, and a machine language application program. The analog interface circuit includes an analog-to-digital converter, a clock circuit, and a decoder. The circuit of the present invention also includes a tri-state bus interface circuit to communicate the state of input switches to the computer. |
