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Primary Examiner: Zache, Raulfe B.
Assistant Examiner:
Attorney: Voss; Donald F.

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Title: Computer system with post execution I/O emulation

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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Inventors: Lewis, David O. (Rochester, MN, US)
Miller, Thomas H. (Rochester, MN, US)
Schmitt, Steven A. (Rochester, MN, US)

Application Number: 428633
Filing Date: 1973-12-26
Publication_date: 1976-02-10
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 710/5
Other Classes:
US Patent Ref:

3374466	Mar, 1968	Hanf et al.	340/172.
3544969	Dec, 1970	Rakoczi et al.	340/172.
3593300	Jul, 1971	Driscol, Jr. et al.	340/172.
3675214	Jul, 1972	Ellis et al.	340/172.
3710328	Jan, 1973	Hunter et al.	340/172.
3721961	Mar, 1973	Edstrom et al.	340/172.
3751645	Aug, 1973	Brandsma et al.	444/1.

Other Refs: Other References: hall, P. H. et al., "Multimode Programmable Machines," IBM Tech. Disc. Bull., Vol. 15, No. 1, June 1972, pp. 243-244.
Tucker, S. G., "Emulation of Large Systems," in Communications of the ACM, Vol. 8, No. 12, Dec. 1965.
Mallach, E. G.; "Emulation: A Survey," in Honeywell Computer Journal, Vol. 6, No. 4, 1972.
Benjamin, R. I., "The Spectra 70/45 Emulator for the RCA 301," in Communications of the ACM, Vol. 8, No. 12, Dec. 1965.
McCormack, M. A. et al., "1401 Compatibility Feature on the IBM System/360 Model 30," in Communications of the ACM, Vol. 8, No. 12, Dec. 1965.