Title: Emulation apparatus

Abstract: A processing unit includes emulation apparatus which operates to execute instructions of a target system, one of a plurality of ways depending upon the options and features of the target system being emulated. The options, features and characteristics of the target system for which the program was originated is defined by the different bits of an option mask word stored within the emulation apparatus. Initially, upon switching to an emulation mode of operation, the emulation apparatus under microprogram control is operative to store signal representations of the option mask word in one of its storage registers. The signals from the stored option mask word are applied to different portions of the emulation apparatus for conditioning the apparatus to execute target system program instructions in accordance with the structural characteristics of the target system for which the program was originated.

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Inventors: Hirtle, Allen C. (Needham, MA, US)
O'Keefe, David B. (Tyngsboro, MA, US)

Application Number: 567981
Filing Date: 1975-04-14
Publication_date: 1978-04-11
Assignee: Honeywell Information Systems Inc. (Waltham, MA)
Primary Class(es): 703/26
Other Classes:
US Patent Ref:

3300764	Jan, 1967	Doelz	340/172.
3374466	Mar, 1968	Hanf	340/172.
3440612	Apr, 1969	Womack	340/172.
3543245	Nov, 1970	Nutter	340/172.
3544969	Dec, 1970	Rakoczi	340/172.
3698007	Oct, 1972	Malcolm	340/172.

Other Refs:
Primary Examiner: Thomas, James D.
Assistant Examiner:
Attorney: Driscoll; Faith F., Prasinos; Nicholas, Reiling; Ronald T.