MOVSW String Instruction in 8086 Microprocessor | 8086 INSTRUCTION SET WITH EMU8086
#MOVSW #StringInstruction8086 #8086Assembly #8086InstructionSet #InstructionSetwithEmu8086
This video tutorial explains the string instruction execution in the emu8086 environment. Particularly MOVSW (Move String Word) execution is discussed in this video tutorial. This video is just the start of string instructions.
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Moves the byte, word, or doubleword specified with the second operand (source operand) to the location specified with the first operand (destination operand). Both the source and destination operands are located in memory. The address of the source operand is read from the DS:ESI or the DS:SI registers (depending on the address-size attribute of the instruction, 32 or 16, respectively). The address of the destination operand is read from the ES:EDI or the ES:DI registers (again depending on the address-size attribute of the instruction). The DS segment may be over-ridden with a segment override prefix, but the ES segment cannot be overridden.
MOVSW instruction is used for moving a string of 16-bit ASCII characters from one place in the memory to another place. Furthermore, string or ASCII characters are letters of a word or a sentence stored in consecutive memory locations. MOVSW instruction copies the content (16-bit) from one block of consecutive locations to another straight block of memory locations. Source location is present in the Data Segment register. Thus its logical source location is specified DS: SI. At the same time, the Destination location is in the Extra Segment of Memory. So, It is specified by ES: DI.
Furthermore, there is no operand involve in the syntax of MOVSB Instruction. One has to use simply the keyword "MOVSB". During the instruction execution, the content of location specified by DS: SI gets copied into the location pointed by ES: SI. And, both the DI and SI registers are incremented by 1. As a result, they point to the following source block (data segment memory locations) and destination block (extra segment memory locations).
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