Communications: electrical – Digital comparator systems
Patent
1973-12-26
1976-02-10
Zache, Raulfe B.
Communications: electrical
Digital comparator systems
G06F 300
Patent
active
039381013
ABSTRACT:
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.
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Lewis David O.
Miller Thomas H.
Schmitt Steven A.
International Business Machines - Corporation
Voss Donald F.
Zache Raulfe B.
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