Browse Prior Art Database

Coprocessor Card for a Personal Computer to Interface to a Secondary Bus

IP.com Disclosure Number: IPCOM000036750D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Kostopoulos, GK: AUTHOR [+5]

Abstract

This article describes a coprocessor card for a personal computer (PC) which provides intelligent control of the input/output I/O address space in a secondary bus.

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Coprocessor Card for a Personal Computer to Interface to a Secondary Bus

This article describes a coprocessor card for a personal computer (PC) which provides intelligent control of the input/output I/O address space in a secondary bus.

The purpose of the card disclosed herein is to provide intelligent control of I/O cards resident on the secondary bus that by nature require substantial processor time. In one diagnostic architecture, an industrial PC communicates with up to sixteen circuit boards, each containing eight serial communications ports. This architecture requires that the PC communicate over more than fifty serial channels at once. This particular application has two inherent problems. The first is that the PC I/O channel does not have enough slots to accommodate the number of cards that would be required. Secondly, the processor would be required to dedicate itself to servicing the serial channels and could not be used for anything else. The solution was to design a card that would not only mate the PC bus (I/O channel) with the secondary bus, thereby increasing the number and types of cards that could be used, but also to provide a separate processor. The card then allows the PC to handle pre-processed data from an increased I/O address space.

Referring to the drawing, the hardware consists of a PC feature card, cable, and a secondary bus card. On the feature card is an Intel 8751 microcontroller which communicates with the PC through two eight-kilob...