Microcode
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A microprogram is a small program that is usually put onto a computer chip. It has instructions on how to do simple things.
Coffee makers and toasters of today have chips with microprograms on them.
Microprogramming is the lowest-level instructions that directly control a microprocessor Microprogramming: The concept of microprogramming was developed by Maurice Wilkes in 1951, using diode matrices for the memory element.