MARIE: An Introduction to a Simple Computer

195 CHAPTER When you wish to produce a result by means of an instrument, do notallow yourself to complicate it. Leonardo da Vinci4 MARIE: An Introductionto a Simple INTRODUCTIOND esigning a Computer nowadays is a job for a Computer engineer with plenty oftraining. It is impossible in an introductory textbook such as this (and in anintroductory course in Computer organization and architecture ) to present every-thing necessary to design and build a working Computer such as those we can buytoday. However, in this chapter, we first look at a very Simple Computer calledMARIE: a Machine architecture that is Really Intuitive and Easy.

Data processing on a computer is usually done on fixed-size binary words stored in registers. Therefore, most computers have registers of a certain size. Common sizes include 16, 32, and 64 bits. The number of registers in a machine varies from architecture to architecture, but is typically a power of 2, with 16 and 32 being most common.

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