System for linking an interposition module between two modules t

Details System for linking an interposition module between two modules t System for linking an interposition module between two modules t

1995-07-05

1999-03-02

Lee, Thomas C.

395836, 395882, 395707, G06F 1300, G06F 1314

Patent

active

058782460

ABSTRACT:
Apparatus that provides additional flexibility for a computer interface that serves two computer subsystems, when at least one of these subsystems undergoes a change, such as a new version, a change in subsystem functionality, or fixing of a "bug." An interposer, positioned between a first interface for a first computer subsystem and a second subsystem interface for a second computer subsystem, monitors command or data request signals and response signals generated in the first subsystem and passing to the second subsystem through the second subsystem interface and tests these signals for recognition by, consistency with and compatibility with, the second subsystem, given the change(s) that have been made in the first computer subsystem. If non-recognition, inconsistency or incompatibility of these signals is present, the interposer advises the first computer subsystem and/or the first interface of any changes that should be made in the command signal parameters to improve the recognition, consistency or compatibility of this command signal. Where possible, the interposer provides default values for these command signal parameters that enhance the recognition, consistency and/or compatibility of the command signal. A second interposer, positioned between the second interface and the first interface, performs similar tasks for a command signal generated and transmitted by the second computer subsystem to the first computer subsystem.

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