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• There are many different types of addressing modes. In Chapter 4, MARIE
used two addressing modes: direct and indirect; however, we see in this chapter
that a large variety of addressing modes exist.
• If words consist of multiple bytes, in what order should these bytes be stored
on a byte-addressable machine? Should the least significant byte be stored at
the highest or lowest byte address? This little versus big endian debate is discussed
in the following section.
• How many registers should the architecture contain and how should these registers
be organized? How should operands be stored in the CPU?
The little versus big endian debate, expanding opcodes, and CPU register organization
are examined further in the following sections. In the process of discussing
these topics, we also touch on the other design issues listed.
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