04084235 is referenced by 81 patents and cites 6 patents.

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.

Title
Emulation apparatus
Application Number
5/567981
Publication Number
4084235
Application Date
April 14, 1975
Publication Date
April 11, 1978
Inventor
David B O Keefe
Tyngsboro
MA, US
Allen C Hirtle
Needham
MA, US
Agent
Ronald T Reiling
Nicholas Prasinos
Faith F Driscoll
Assignee
Honeywell Information Systems
MA, US
IPC
G06F 13/00
G06F 9/16
G06F 1/00
G06F 15/20
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