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The MAR and MBR are old friends, and work just as described in Chapter 6.
Here are some statistics on the CSC-1:
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Size of MAR = 12 bits
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This implies that there are 4096 words
in memory.
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Size of MBR = 16 bits
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Each word of memory is 16 bits wide.
Thus the CSC-1 is not byte addressable,
but rather word addressable.
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All other regs = 16 bits wide
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One word of memory fits snugly into
A, S, PC, IR, or TMP
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