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AssigneeInternational Business Machines Corporation
InventorsDavid O. Lewis, Thomas H. Miller, Steven A. Schmitt
Estimating the term…
A computer system executes instructions for an I/O device not attached to the system. A quasi I/O attachment device is responsive to the commands for the unattached I/O device and generates an interrupt condition. The interrupt condition causes the command instructions for the unattached I/O device to be translated to command instructions for an I/O device connected to the computer system. The I/O device attached to the system performs the designated operation and generates associated I/O device status data. This associated I/O device status data is translated into I/O device status data for the unattached I/O device and thus permits a program for operating an unattached I/O device to operate instead an I/O device attached to the system which otherwise could not be operated by that program. A second embodiment performs the emulation of the unattached I/O device remotely of the central processing unit in the computer system.
In a computer system includingn a main storage, a central processing unit connected to said main storage, at least one I/O attachment device connected to said central processing unit, and an I/O device connected to said I/O attachment device, said main storage storing sequences of instructions for operating an I/O device other than said I/O device connected to said I/O attachment device, the improvement comprising
In a computer system including a main storage, a central processing unit connected to said main storage, an I/O attachment device, and an I/O device connected to said I/O attachment device, said main storage storing instructions for operating an I/O device other than said I/O device, the improvement comprising
In a computer system including a main storage and a central processing unit connected to said main storage, the improvement comprising
Dependencies are inferred from the claim text.