Browse Prior Art Database

Automatic Math Co-Processor Presence Detection for Personal Computers

IP.com Disclosure Number: IPCOM000040469D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Huynh, DH: AUTHOR [+3]

Abstract

A technique is described whereby a math co-processor may be installed in a personal computer (PC) without modifying switch settings. An individual circuit provides a detection and testing function to automatically detect the presence of a math co-processor. In prior art, whenever a math co-processor was installed in a PC, DIP switch settings required modification to enable determining the presence of the co-processor. A DIP socket is provided on the planar board for the co-processor option. The presence of the co-processor is automatically detected by latching the state of the busy signal, as shown in the figure. It is assumed that the presence of the co-processor will not be busy at the end of a system reset.

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Automatic Math Co-Processor Presence Detection for Personal Computers

A technique is described whereby a math co-processor may be installed in a personal computer (PC) without modifying switch settings. An individual circuit provides a detection and testing function to automatically detect the presence of a math co-processor. In prior art, whenever a math co-processor was installed in a PC, DIP switch settings required modification to enable determining the presence of the co-processor. A DIP socket is provided on the planar board for the co-processor option. The presence of the co-processor is automatically detected by latching the state of the busy signal, as shown in the figure. It is assumed that the presence of the co-processor will not be busy at the end of a system reset. If the presence is not detected, the interrupt signal which controls the operation of the co-processor will be masked off so as to prevent spurious interrupts. The actual presence of the co-processor is tested by reading the assigned port bit designation.

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