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8085 Block movement without overlap
In this program, we will see how to move blocks of data from one place to another.
Problem Statement
Write 8085 Assembly language program to move a data block. The blocks are assumed to be non-overlapping. The block size is given, the block is starting from X and we have to move it to the location Y.
Discussion
The non-overlapping block movement is relatively an easy task. Here the block is starting at position X, we have to move it to position Y. The location Y is far away from X. So Y > X + block size.
In this program, the data are stored at location 8010H, and we will place it 9010H. The block size is stored at location 8000H.
We are loading the source address into HL pair, and destination address into DE register pair. We are simply taking the data from the source and placing it at the destination.
Input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 07 |
| . . . | . . . |
| 8010 | 11 |
| 8011 | 22 |
| 8012 | 33 |
| 8013 | 44 |
| 8014 | 55 |
| 8015 | 66 |
| 8016 | 77 |
| . . . | . . . |
Flow Diagram
Program
| Address | HEX Codes | Labels | Mnemonics | Comments | |
|---|---|---|---|---|---|
| F000 | 21,00, 80 | LXIH, 8000H | Load the location to find block size | ||
| F003 | 4E | MOVC, M | store block size into C register | ||
| F004 | 21,10, 80 | LXI H, 8010H | load the source address to HL pair | ||
| F007 | 11,10, 90 | LXI D, 9010H | load the destination address to DE pair | ||
| F00A | 7E | LOOP | MOV A, M | Load Acc with the memory element | |
| F00B | 12 | STAX D | Store acc content to the memory pointed by D | ||
| F00C | 13 | INX D | Increase DE register pair | ||
| F00D | 23 | INX H | Increase HL register pair | ||
| F00E | 0D | DCR C | Decrease C register | ||
| F00F | C2,0A, F0 | JNZ LOOP | Jump to Loop | ||
| F012 | 76 | HLT | Terminate the program | ||
Output
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 07 |
| . . . | . . . |
| 8010 | 11 |
| 8011 | 22 |
| 8012 | 33 |
| 8013 | 44 |
| 8014 | 55 |
| 8015 | 66 |
| 8016 | 77 |
| . . . | . . . |
| 9010 | 11 |
| 9011 | 22 |
| 9012 | 33 |
| 9013 | 44 |
| 9014 | 55 |
| 9015 | 66 |
| 9016 | 77 |
| . . . | . . . |
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