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LES register, memory address of first word.

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The PUSH instruction decrements stack pointer by two and copies a word from some source to the location in the stack where the stack pointer points. The source and destination in a MOV instruction must be of same type i.e. So, for that purpose, we have various Shift and Rotate instructions present in the 8086 microprocessor. » SQL The XCHG instruction exchanges the contents of the source and destination.

» Ajax and values instead of their 16-bit (ax, bx, etc.) If the DS, ES, FS, or GS register contains a NULL segment selector.

XLAT is actually a huge performance win on the 8086. XLAT introduces the concept of a "dictionary lookup." Consider an example to understand the behavior of MOV instruction. » HR

Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.

It pops the data from the first two memory locations pointed by stack pointer into the flag register and then increment SP by 2.

The 8086 MOV instruction supports the following operands: The instruction MOV mem, mem is illegal. The word from the first two memory location is copied into the specified register and the word from the next two memory locations is copied into the ES register.

The ROR instruction stands for ‘Rotate Right’.

» Python This instruction copies a word from the two memory locations at the top of stack to the flag register and increments ‘stack pointer by 2. Locates a byte entry in a table in memory, using the contents of the AL register as a table index, then copies the contents of the table entry back into the AL register. The source and destination both must be words or bytes. LAHF, SAHF, PUSHF, POPF transfer flag registers. As we know that any machine (system) works on machine language, which consists of binary numbers.

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Sometimes, the need to perform some necessary shift and rotate operations on our data may occur according to the given condition and requirement. BX register stores the offset of the starting address of the lookup table and AL register stores the byte number from the lookup table.

The POP instruction copies a word from the stack location pointed by the stack pointer to the destination. The BX register contains the offset address of the lookup table. Therefore, both source and destination operands cannot be memory address.

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