8085 Programming: Exchange the contents of memory locations



8085 Programming





Exchange the contents of memory locations 2000H and 4000H.






Program 1:



LDA 2000H : Get the contents of memory location 2000H into accumulator



MOV B, A : Save the contents into B register



LDA 4000H : Get the contents of memory location 4000H into accumulator



STA 2000H  : Store the contents of accumulator at address 2000H



MOV A, B : Get the saved contents back into A register



STA 4000H : Store the contents of accumulator at address 4000H









Program 2:



LXI H 2000H : Initialize HL register pair as a pointer to memory location 2000H.



LXI D 4000H : Initialize DE register pair as a pointer to memory location 4000H.



MOV B, M  : Get the contents of memory location 2000H into B register.



LDAX D : Get the contents of memory location 4000H into A register.



MOV M, A : Store the contents of A register into memory location 2000H.



MOV A, B : Copy the contents of B register into accumulator.



STAX D : Store the contents of A register into memory location 4000H.



HLT : Terminate program execution.



Note: In Program 1, direct addressing instructions are used, whereas in Program 2, indirect addressing instructions are used.

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