Different applications require different peripherals. Instead of having a separate controller board for each application, it is more cost effective to have one general controller board and a separate board which has the peripherals for that specific application. 

This project uses the 8085 microprocessor in designing a cost effective controller board with 4K RAM and 4K ROM of memory, data and address bus drivers, and bus and control signal connectors. A serial and parallel I/0 board and a keypad/monitor board are designed to interface with the controller board.   
 

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