Browse Prior Art Database

Single Card Attachment to Host And Local Area Network

IP.com Disclosure Number: IPCOM000041207D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Belisle, SW: AUTHOR [+3]

Abstract

A method is described for sharing a single card for connecting a personal computer to a host and Local Area Network (LAN). The problem with sharing a single card to interface with both devices is that different software is used to enable each of the two interfaces.

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Single Card Attachment to Host And Local Area Network

A method is described for sharing a single card for connecting a personal computer to a host and Local Area Network (LAN). The problem with sharing a single card to interface with both devices is that different software is used to enable each of the two interfaces.

A software test is employed to solve this problem. The test checks whether the host communication and the LAN support have both been assigned to run on the same interrupt level. If they have, sharing of a single card is indicated. An "interrupt conflict" state is set and the host communication interrupt service process is loaded alone. When an interrupt occurs on the level assigned to the host/LAN support, the LAN host communication interrupt service attempts to handle the request. If it fails, the host code is used to process the request. If there are two cards installed, then each card is used to provide one of the two services.

The advantage of this method is that two cards are not required to enable host and LAN support. In addition, the user is not required to do any configuring of the software to enable the support one or two cards.

Disclosed anonymously.

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