Load and store strings :(LOD SB/LOD SW and STO SB/STO SW) LOD SB: 

Loads a byte from a string in memory into AL. The address in SI is used relative to DS to determine the address of the memory location of the string element. 

(AL) ← [(DS) + (SI)] 

(SI) ← (SI) + 1 

LOD SW : The word string element at the physical address derived from DS and SI is to be loaded into AX. SI is automatically incremented by 

(AX) ← [(DS) + (SI)] 

(SI) ← (SI) + 2 

STO SB : Stores a byte from AL into a string location in memory. This time the contents of ES and DI are used to form the address of the storage location in memory 

[(ES) + (DI)] ← (AL) 

(DI) ← (DI) + 1 

STO SW :[(ES) + (DI)] ← (AX) 

(DI) ← (DI) + 2 

Mnemonic Meaning Format Operation Flags affected 

MOV SB 

Move 

String 

Byte 

MOV 

SB 

((ES)+(DI))←((DS)+(SI)) 

(SI)←(SI) m 1 

(DI) ← m 1 

None 

MOV SW 

Move 

String 

Word 

MOV 

SW 

((ES)+(DI))←((DS)+(SI)) 

((ES)+(DI)+1)←(DS)+(SI)+1) 

(SI) ← (SI) m 2 

(DI) ← (DI) m 2 

None 

LOD SB /

LOD SW 

Load 

String 

LOD 

SB/

 LOD 

SW 

(AL) or (AX) ←((DS)+(SI)) 

(SI)←(SI) m 1 or 2 

None 

33 

STOSB/ 

STOSW 

Store 

String 

STOSB/ 

STOSW

((ES)+(DI))←(AL) or (AX) 

(DI) ← (DI) 71 or 2 

None