Personal computer with alternate system controller error detecti

Details Personal computer with alternate system controller error detecti Personal computer with alternate system controller error detecti

1992-04-24

1994-01-04

Canney, Vincent P.

Excavating

371113, 364228, 3642688, G06F 1100

Patent

active

052768643

ABSTRACT:
This invention relates to personal computers having the capability for the usual system controlling processor to be reset, initialized and then isolated if an alternate system controller is provided for the system. In accordance with this invention, a personal computer system has a high speed local processor data bus; an input/output data bus; a microprocessor coupled directly to the local processor bus; a connector coupled directly to the local processor bus for accommodating reception of an alternate system controller; and a bus interface controller coupled directly to the local processor bus and directly to the input/output data bus for providing communications between the local processor bus and the input/output data bus, with the bus interface controller providing for detection of an error signal generated by an alternate system controller mounted in the connector and indicative of the failure of the alternate system controller. In response to detection of the error signal, the bus interface controller transfers control of the local processor bus from the alternate system controller to the microprocessor.

REFERENCES:
An Introduction to Operating Systems by Harvey M. Deitel, Addison-Wesley Publishing Co. .COPYRGT.1990, pp. 320, 321 and 536.
Upgrading to MS-DOS 5.RTM. by Brian Unerdahl, Que Corp. .COPYRGT.1991, p. 40.

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