Multiple choice

Where does the microcode reside?

  1. RAM

  2. ROM

  3. Cache memory

  4. Control store

  5. Hard disk
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The microcode usually does not reside in the main memory, but in a special high speed memory, called the control store. It might be either read-only or read-write memory. In the latter case the microcode would be loaded into the control store from some other storage medium as part of the initialization of the CPU, and it could be altered to correct bugs in the instruction set, or to implement new machine instructions.

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