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A decoder is required in case of a ______________

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A decoder is required in case of a ______________

(a) Vertical Microinstruction

(b) Horizontal Microinstruction

(c) Multilevel Microinstruction

(d) All types of microinstructions

I got this question in final exam.

This key question is from The Control Unit topic in chapter Basic Computer Organisation of Computer Fundamentals

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Right answer is (a) Vertical Microinstruction

The explanation: There are two types of microinstructions: Horizontal and Vertical.

In a horizontal microinstruction, each bit represents a signal to be activated whereas, in case of vertical microinstruction bits are decoded and, the decoder then produces signals.

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