The execution unit contains a 16 bit Base Pointer
register. It also contains a 16 bit Source Index register and a 16 bit
Destination Index register. These 3 register can be used for the temporary
storage of data just as the general purpose register.
Their main use is to hold the 16 bit offset of a data
word in one of the segment.
Say for example SI is used for holding the offset of data
word in data segment.
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