| 摘要 |
PURPOSE: A key-lock device of a computer is provided to keep a security function by preventing an input of a key though a header connected with a locking device is removed by a physical force. CONSTITUTION: An I/O chip set(30) outputs a high state interrupt request signal(IRQ1) to a main chip set(40) and permits an input of a key when a high state signal is inputted to a general input/output pin(GPIO). A pull-up resistance(R) maintains the high state of the general input/output pin(GPIO). The general input/output pin(GPIO) is connected with a cable by a 4-pin header(50). The first and the second AND gates(60,70) are connected with an interrupt request signal line(IRQ1) of the I/O chip set(30), the pull-up resistance(R), and the 4-pin header(50). A locking device(10) connects or disconnects the 4-pin header(50) to a grounding power by a user key or disables the second AND gate(70) in a locking state.
|
