| 摘要 |
A system management interrupt (SMI) generation circuitry (25) is provided to a universal serial bus (USB) (22) compliant personal computer (PC) for generating an SMI whenever the USB controller (32) attempts to generate a data in interrupt in response to data in from a USB compatible keyboard/pointing device (34,36), and whenever an application attempts to perform a direct data out to the AT keyboard controller (30). An SMI handler (21) is provided to service the SMIs, rerouting the data in to the appropriate input port of the AT keyboard controller, simulating receipt of the data from an attached keyboard, thereby providing the data in to the non-USB cognition application, and rerouting the data out to the USB controller, thereby providing the data to the targeted USB keyboard/pointing device. Therefore, compatibility is maintained between a USB compatible keyboard/pointing device and non-USB cognition applications which perform direct data in and data out against the keyboard controllers.
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