| 摘要 |
In order to determine, where a terminal device and a computer main frame are connected by a PS/2 interface or a USB interface, which interface is connected, the main frame and the terminal device monitor the states of two signal lines after the PS/2 or USB interface is connected to a port of the terminal device, and the interface is determined to be one for PS/2 use if the states are (H, H) or (H, L). If the states are (L, L), a distinguishing signal assigning section on the terminal device side turns on a switching means to give an H signal to the signal lines.
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