International Business Machines Corporation

Dhruvkumar M Desai

Andrew B McNeill

Ernest Nelson Mandese

Richard N Mendelson

Francis M Bonevento

Sammy D Dodds

Richard Bealkowski

Dennis L Moeller

Douglas R Chisholm

Robert B Haig

Essy Tashakori

Douglas R Chrisholm

A personal computer is provided with primary and secondary non-volatile storage devices for initializing the system when power is turned on. The primary device is a flash RAM. A flash ROM memory controller include means to detect when the flash ROM becomes corrupted and to switch over to the secondary device for initialization allowing the flash ROM to be later reprogrammed.

Data processing system including corrupt flash ROM recovery

A Command interface includes ports for transferring information between a host processor and at least one intelligent subsystem which may have attached devices. A Command Interface port receives either a direct command or an indirect command from the host processor, which commands are indicative of a type of operation to be performed by the one subsystem or an attached device. An Attention port receives a code from the host processor which is indicative of which one of the direct command or the indirect command is received at the Command Interface port, and which is also indicative of which of the one intelligent subsystem or a device is to execute the command. A command busy/status port receives a code from the one intelligent subsystem which is indicative of whether or not the Command Interface port and the Attention port are busy, and whether or not the one intelligent subsystem is accepting or rejecting commands. The host processor can read this port without altering or updating the code.

Command delivery for a computing system for transferring data between a

A command interface includes ports for transferring information between a host processor and at least one intelligent subsystem which may have attached devices. A Command Interface port receives either a direct command or an indirect command from the host processor, which commands are indicative of a type of operation to be performed by the one subsystem or an attached device. An Attention port receives a code from the host processor which is indicative of which one of the direct command or the indirect command is received at the Command Interface port, and which is also indicative of which of the one intelligent subsystem or a device is to execute the command. A command busy/status port receives a code from the one intelligent subsystem which is indicative of whether or not the Command Interface port and the Attention port are busy, and whether or not the one intelligent subsystem is accepting or rejecting commands. The host processor can read this port without altering or updating the code.

Command delivery for a computing system for transfers between a host and

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Boynton Beach, FL, United States of America

Dhruvkumar M Desai