The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1991
Filed:
Mar. 22, 1990
Joseph H Binkley, Palo Alto, CA (US);
Perry A Caro, Palo Alto, CA (US);
Charles R Fay, Long Beach, CA (US);
Jeffery W Lee, Sunnyvale, CA (US);
Everett T Neely, Montara, CA (US);
Geoffrey O Thompson, Palo Alto, CA (US);
Gaya Vukkadala, Sunnyvale, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
An emulating data processor includes a host sytem and an emulating processor with outputs to and inputs from the host system. An input/output processor handles I/O operation requests of the emulating processor, using the host system I/O devices to emulate some of the PC I/O devices. Floppy operations may be handled either by a floppy disk controller like that of the PC or by a software controller of a file in host rigid disk memory which may be accessed as a PC floppy disk, so that a data structure containing parameters of the operation is loaded and provided to the appropriate controller. Rigid disk operations are handled by another file in host rigid disk memory which may be accessed as a PC rigid disk, and an appropriate I/O operating system routine is provided so that the emulating processor can pass the operation parameters through to the host rigid disk controller in a group of registers.