System for facilitating data I/O between serial bus input device and non- serial bus cognition application by generating alternate interrupt and shutting off interrupt triggering activities

摘要

A system management interrupt (SMI) generation circuitry is provided to a universal serial bus (USB) complaint personal computer (PC) for generating a SMI whenever the USB controller attempts to generate a data- in interrupt received response to data in from a USB compatible keyboard/pointing device, and whenever an application attempts to perform a direct data-out to the AT keyboard controller. Additionally, a SMI handler is provided to service the SMIs, rerouting the data in to the appropriate input port of the AT keyboard controller, simulating receipt of 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. As a result, compatibility is maintained between a USB compatible keyboard/pointing device, and non-USB cognition applications that perform direct data-in and data-out against the keyboard controllers.