8085 Program to Copy 16 Data from One Location to another Location

Let us suppose that the 16 data are stored starting from 9000H and we are to move the data into location starting from 9100H.

Algorithm:

1. Start.
2. Load into register pair HL from memory location 9000H which is the source location.
3. Load into register pair DE from 9100H which is the destination location.
4. Move 10 into register C which acts as counter (16 in decimal = 10 in hexadecimal).
5. Move content of memory M into accumulator A.
6. Store content of accumulator into register pair DE.
7. Increment register pair HL by 1.
8. Increment register pair DE by 1.
9. Decrement register C by 1.
10. If no zero is present, go to step 5 else go to 11.
11. Terminate the program.

Program Code:

LXI H, 9000H

LXI D, 9100H

MVI C, 10H

UP:

MOV A, M

STAX D

INX H

INX D

DCR C

JNZ UP

HLT

The HL register pair is loaded with memory location 9000H which is the source and the DE register pair is loaded with memory location 9100H which is the destination. Now, 10H (which means 16 in decimal) is moved into register C which is used as counter. Now, the content of memory M is moved into accumulator A and now the content of accumulator is stored into memory location pointed by the DE register pair. The register pair HL is incremented by 1 so that it points to the next data item and the DE register pair is also incremented by 1 so that it points to the next location of memory where the data is to be moved. The counter is decrement by 1. The data now pointed is again moved into accumulator and the content of accumulator is stored into memory location pointed by the DE register pair. The HL and DE register pair are again incremented by 1 and the counter is decremented by 1.

These steps are repeated as long as the counter is greater than 0.

Output:

Example

Here, the 16 data’s starting from memory address 9000H is moved into memory address starting from 9100H. Now, since memory address 9010 and 9011 are the 17^th and 18^th data so they are not copied into memory address 9110 and 9111.