May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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4.1 | String Instructions
e 8086 has a set of instructions for handling blocks of data in the form of bytes or words.
ey are called ‘string’ instructions. A string is an array of data of the same type – for example,
a character string or a byte string. Table 4.1 gives the list of string instructions/prefi xes which
are used in string manipulations. e usefulness of string instructions can be seen when in the
memory, data has to be moved, searched or compared in blocks.
Consider the case of 100 (say) words or bytes in a particular memory area that is to be moved
to another memory area. is can very well be done using pointer registers and ...
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