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The instruction set is very limited and is simple.
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Its primary purpose is to develop a basic understanding of how a computer works, interacts with memory and other parts of the system like input and output.
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The SAP-1 computer is the first stage in this evolution and contains the basic necessities for a functional computer. SAP computers are classified into stages, each stage more evolved and considering more advanced concepts in computer architecture than the previous. Simple as Possible (SAP) computers in general were designed to introduce beginners to some of the crucial ideas behind computer operations. Designing and Implementing a SAP-1 Computer
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