Bull Hn Information Systems, Inc.

Mathew J Kubik

Richard S Bianchi

Marcia T Fogelgren

The emulation of a first system disk drive on a second processing system including a second system user level process including first system user and executive tasks issuing disk input/output requests. An emulator level is interposed between the second system user level process and a kernel level and includes a pseudo device driver corresponding to the first system disk drive and the kernel level includes a kernel process corresponding to the pseudo device driver and emulating the disk drive. The pseudo device driver and the kernel process execute in a second system process to emulate the operations of the disk drive and the kernel process emulating the disk drive is a file input/output process. The pseudo device driver includes a pseudo device queue, a return queue and a queue manager responsive to first system disk input/output instructions and to completed disk operations. The second system includes a resource control table containing a disk drive type identification as a SCSI type drive and the kernel process reads the file capacity of the second system file emulating the first system disk drive and provides the file capacity to the requesting task as the disk drive capacity.

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Wakefield, MA, United States of America

Mathew J Kubik