USB legacy support system

Details USB legacy support system USB legacy support system

1998-04-16

2000-05-23

Myers, Paul R.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

710 62, 710129, 710 73, 710 15, G06F 1502

Patent

active

060675896

ABSTRACT:
Data input from a USB keyboard or mouse to a USB host controller is transformed by an SM-BIOS into data corresponding to a PS/2 keyboard/mouse, and then transferred to the I/O port (60h/64h) of a standard bus interface via the shadow port of a KBC. The KBC generates IRQ1 (IRQ12) similar to the case wherein it receives data from the PS/2 keyboard or mouse, thereby starting a keyboard driver.

REFERENCES:
patent: 5590312 (1996-12-01), Marisetty
patent: 5610601 (1997-03-01), Lahti et al.
patent: 5613135 (1997-03-01), Sakai et al.
patent: 5628029 (1997-05-01), Evoy
patent: 5748888 (1998-05-01), Angelo et al.
patent: 5835791 (1998-11-01), Goff et al.
"OpenHCI Legacy Support Interface Specification", Compaq Microsoft National Semiconductor, Release Version 1.01, pp. i-v and 1-11, (1996).
OpenHCI--Open host Controller Interface Specification for USB, Compaq National Semiconductor, pp. 132-146.

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