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Keyboard-Less Personal System

IP.com Disclosure Number: IPCOM000034970D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 13K

Publishing Venue

IBM

Related People

Anzelone, TA: AUTHOR [+7]

Abstract

Two techniques are described whereby personal computer systems, such as the IBM PS/2, can be enabled and disabled without a keyboard attached. The concept is particularly useful for systems in remote installations, or for security reasons when the keyboard should not be installed. One technique uses software only to enable the system to operate without a keyboard. The other technique is a hardware implementation to provide the proper signals to take the place of the keyboard, through the use of an intelligent terminator. Personal systems are designed to test many function through power on self test (POST) operation. One of the functions is the detection when a keyboard is not attached. However, there may be occasions which require operation without a keyboard.

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Keyboard-Less Personal System

Two techniques are described whereby personal computer systems, such as the IBM PS/2, can be enabled and disabled without a keyboard attached. The concept is particularly useful for systems in remote installations, or for security reasons when the keyboard should not be installed. One technique uses software only to enable the system to operate without a keyboard. The other technique is a hardware implementation to provide the proper signals to take the place of the keyboard, through the use of an intelligent terminator. Personal systems are designed to test many function through power on self test (POST) operation. One of the functions is the detection when a keyboard is not attached. However, there may be occasions which require operation without a keyboard. Two concepts described herein enable a system to automatically, after an initial setup, proceed with testing operations without the keyboard attached, thereby enabling the system to function without a keyboard. The first concept involves the use of a software program to set specific reserve bits at power-on time. A keyboard is required during this initial setup of the reserve bits. This ensures that the proper reserve bits, corresponding to the model designation applicable to the system, will be set to the proper setting. However, once the reserve bits are set, the system's built-in battery will retain the reserve bit setup so that the keyboard removal will not affect the operation of the system at the subsequent power-on operations. Certain reserve bits, in the basic system design, are reserved for test operation during the manufacture of a system. The program makes use of these bits to detect the presence of a keyboard during the POST operation. The program is designed to...