Importance

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Abstract

A fax machine includes a print controller, a fax controller and random access memory. Generic control code is stored in ROM of the print controller, and paper path code is stored in ROM of the fax controller. Upon startup of the fax machine, the fax controller passes copies of paper path code functions and variable values to the print controller. The print controller, in turn, writes the variable values to a jump table in the random access memory, writes the functions to designated portions of the random access memory, and writes starting addresses of the functions to the jump table. During operation of the fax machine, the print controller executes the generic control code and uses the jump table to access the variable values and to execute the functions. Thus, the jump table allows the print controller to interface the generic control code with the device-specific variable values and the functions.

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First Claim