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Alternate attachment method of PS2 (or Serial Devices)

IP.com Disclosure Number: IPCOM000032068D
Original Publication Date: 2004-Oct-22
Included in the Prior Art Database: 2004-Oct-22
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Abstract

The basic idea is to allow the user to select one of three possible ways to attach their PS2 device. In the case of the SureOne, the typical devices connected are bar code scanners, magnetic stripe/smart card readers, and PS2 keyboards. The basic problem being solved here is a result of the original system design (also seen in standard PC type wedge designs) in which a microprocessor acting as a keyboard controller is the gate between all input devices. By allowing many different connection methods, the number and the reliability of devices that can be connected is greatly increased. The user can simply choose the connection method by which best works with their device.

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Alternate attachment method of PS 2 (or Serial Devices)

     The basic idea is to allow the user to select one of three possible ways to attach their PS2 device. In the case of the SureOne the typical devices connected are bar code scanners, magnetic stripe/smart card readers, and PS2 keyboards. The basic problem being solved here is a result of the original system design (also seen in standard PC type wedge designs) in which a microprocessor acting as a keyboard controller is the gate between all input devices.

Original SureOne Keyboard Controller Configuration:

C h ip s e t K e y b o a rd C o n tro lle r

In te g r a te d K e y b o a rd

S u re O n e K e y b o a rd C o n tro lle r

E x te rn a l D e v ic e

     We found that some external devices did not function well or at all with the propagation delays introduced by the SureOne Keyboard Controller.

The following diagram illustrates the solution/invention:

Chipset Keyboard C o ntro lle r

SureOne K e yb o a rd Controller

Integ ra ted Keyboard

Control Logic

External D evice

This allows the user to select one of the three following modes:
1) Normal - The external device communicates through the SureOne Keyboard Controller as in the original design
2) Direct - The external device is directly connected to the Chipset Keyboard Controller
3) Auto - The control logic senses data and connects the appropriate device to the Chipset Keyboard Controller automatically

     Others have attempted to solve this problem in what is commonly known a...