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LOW COST METHOD FOR ADDING USB KEYBOARD AND MOUSE SUPPORT TO LAPTOP AND DESKTOP PCS.

IP.com Disclosure Number: IPCOM000014533D
Original Publication Date: 2001-Feb-10
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue

IBM

Abstract

LOW COST METHOD FOR ADDING USB KEYBOARD AND MOUSE SUPPORT TO LAPTOP AND DESKTOP PCS. Background: USB (a desktop serial bus) is an emerging standard for PC connectivity technology. One of its advantages is that it frees up a scarce system resource (e.g. processor interrupts) by consolidating the functions served by the keyboard, mouse, serial, and parallel ports (and more...) on a single sharable bus thereby placing them on a single, sharable interrupt. Problem: USB keyboards and mice are currently costly, hence the transition from PS/2 to USB will be slow for PC manufacturers. Also, USB poses a challenge for Legacy operating systems (Windows 3.1, Sun OS, etc) since these operating systems don't support USB (and probably never will). This support can be implemented by BIOS vendors, but legacy device support (keyboard/mouse) in BIOS is a large development expense, plus it takes up a large amount of BIOS run-time memory (more than 48K).