Backward compatible diagnostic tool

DETAILED DESCRIPTION The system of the present invention accommodates this need by providing a cartridge adapter for receiving existing vehicle diagnostic cartridges programmed for use with an 8-bit microprocessor.
The adapter receives existing cartridges and is coupled to a field programmable gate array (FPGA) programmed to emulate the operation of the 8-bit microprocessor, such as a Motorola 6803, and supplies information to a 32-bit microprocessor coupled to a display and control panel to emulate the operation of a system for which the cartridges have been programmed.
Additionally, the 32-bit microprocessor includes programming for new vehicles as well as the ability to use updated vehicle information through flash memory to be continuously updated.
A second FPGA provides a communication interface between the vehicle input/output circuit for providing communication using the various protocols employed by different vehicle manufacturers.
With such a system, therefore, existent cartridges for earlier vehicles can be employed and testing conducted by field technicians in the same manner as they have been accustomed to while using a tester which is programmed for use with newer vehicles such that service personnel can service all vehicles utilizing familiar testing techniques for earlier vehicles as well as a higher speed, more efficient microprocessor for both older vehicles and new vehicles.
These and other features, objects and advantages of the present invention will become apparent upon reading the following description thereof together with reference to the accompanying drawings.