Abstract: The invention relates to a dedicated microprocessor for an electronic taximeter, and a taximeter including the microprocessor. The microprocessor includes, (a) a main memory for storing data at a plurality of storage locations therein; (b) a data memory for receiving input data at a plurality of storage locations therein; (c) a combiner for combining the data storage locations of the main memory with the input data of respective storage locations of the data memory for updating the main memory; (d) a program memory for controlling the operation of the data memory, and comprising a plurality of storage locations therein; (e) a counter for sequentially selecting the storage locations of the main memory and the program memory; and (f) clock means for driving the counter means through its cycle. The main memory means is preferably a random access memory (RAM), and the data memory means and the program memory means can comprise, respectively, first and second read only memory (ROM) means.