A Simple Microcomputer Based on CMOS Microprocessor CDP1802

CMOS microprocessor is the most appropriate for applications where power drain and high noise immunity are important factors. Space instrumentation and automotive control are a few applications. A single-card microcomputer based on CMOS microprocessor CDP1802 and utility program UT4 which is capable of addressing 4K bytes of memory, has been designed. This microcomputer is based on a single- sided printed circuit board with a few component side connections. It has one I/O port and teletype interface as well as provision for driving loud speaker.Hex-keyboard can also be used along with this microcomputer to load the data/program using DMA facility available on the microprocessor. In that case, ROM containing utility program 13T4 can be omitted.