Stosb instruction in 8086

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28 Nov 2015 The stos (Store String) instruction copies the value in AL, AX or EAX into stosb stores a byte from the AL register into the destination operand.
The string instructions facilitate operations on sequences of bytes or words. The STOSB and STOSW instructions are similar to MOVSB and MOVSW, exceptThe STOS instruction copies the data item from AL (for bytes – STOSB), AX (for words – STOSW) or EAX (for doublewords – STOSD) to the destination string,

Stores a byte, word, or doubleword from the AL, AX, or EAX register, respectively, into the destination operand. The destination operand is a memory location, the address of which is read from either the ES:EDI or the ES:DI registers (depending on the address-size attribute of the instruction, 32 or 16, respectively).
STOS/STOSB/STOSW/STOSD — Store String Data Opcode Instruction Clocks 0 to 0FFFFH Virtual 8086 Mode Exceptions Same exceptions as in Real Address
The STOS instruction only requires a destination string (pointed at by ES:DI). The semantics of the instructions STOSB, STOSW, and STOSD are illustrated
LAHF Instruction in 8086: Load lower byte of flag register in AH. This instruction copies the contents of lower byte of 8086 flag register to AH register. STOSB instruction in 8086: The STOS instruction copies a byte from AL or a word from AX to a memory location in the extra segment.
String instructions were designed to operate on large data should use the following instructions: ? CLD to clear the After execution of STOSB. If DF=0 then:.
To make DF = 0, use the cld instruction To copy the first two bytes of str1 to str2, we use the following instructions: The STOSB and STOSW Instructions.
The STOS instruction copies a byte (word) from AL (AX) to a memory location stored in [ES:DI]. Usage STOS <String>. STOSB. STOSW. Flags None. Clocks and Size. Operands, Clocks, Size in Bytes. 8086, 286, 386, 486. string, 11, 3, 4, 5, 1

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