8085 Assembly Language Programs - For Exam
1. 8-bit Addition
| Instruction | Explanation |
|---|---|
| LDA 2000H | Load first number into A |
| MOV B,A | Store in B |
| LDA 2001H | Load second number |
| ADD B | A = A + B |
| STA 2002H | Store result into memory |
| HLT | Stop execution |
2. 16-bit Addition
| Instruction | Explanation |
|---|---|
| LHLD 2000H | Load first 16-bit number into HL register pair |
| XCHG | Exchange HL with DE (store first number in DE) |
| LHLD 2002H | Load second 16-bit number into HL |
| DAD D | Add DE to HL (HL = HL + DE) |
| SHLD 2004H | Store result from HL into memory |
| HLT | Stop execution |
Fig: 8-bit and 16-bit Addition in 8085 Assembly Language
3. Subtraction (8-bit)
| Instruction | Explanation |
|---|---|
| LDA 2000H | Load first number into accumulator |
| MOV B,A | Copy first number into register B |
| LDA 2001H | Load second number into accumulator |
| SUB B | Subtract B from A (A = A - B) |
| STA 2002H | Store result in memory |
| HLT | Stop execution |
4. Multiplication
| Instruction | Explanation |
|---|---|
| MVI B,05H | Load multiplier into register B |
| MVI C,03H | Load multiplicand into register C |
| MVI A,00H | Clear accumulator |
| LOOP: ADD C | Add multiplicand to accumulator |
| DCR B | Decrement counter |
| JNZ LOOP | Repeat until B becomes zero |
| STA 2000H | Store result |
| HLT | Stop execution |
5. Division
| Instruction | Explanation |
|---|---|
| MVI B,03H | Load divisor into register B |
| LDA 2000H | Load dividend into accumulator |
| MVI C,00H | Initialize quotient to zero |
| LOOP: CMP B | Compare A with divisor |
| JC END | If A < B, jump to END |
| SUB B | Subtract divisor from A |
| INR C | Increment quotient |
| JMP LOOP | Repeat loop |
| END: STA 2001H | Store remainder |
| MOV A,C | Move quotient to accumulator |
| STA 2002H | Store quotient |
| HLT | Stop execution |
6. Largest Number
| Instruction | Explanation |
|---|---|
| LXI H,2000H | Load address of array |
| MOV C,M | Load count into register C |
| INX H | Point to first element |
| MOV A,M | Assume first element as largest |
| LOOP: INX H | Move to next element |
| CMP M | Compare with current largest |
| JNC SKIP | If A ≥ M skip update |
| MOV A,M | Update largest value |
| SKIP: DCR C | Decrease counter |
| JNZ LOOP | Repeat loop |
| STA 2100H | Store result |
| HLT | Stop execution |
7. Smallest Number
| Instruction | Explanation |
|---|---|
| LXI H,2000H | Load array address |
| MOV C,M | Load count |
| INX H | Point to first element |
| MOV A,M | Assume smallest |
| LOOP: INX H | Next element |
| CMP M | Compare values |
| JC SKIP | If A < M skip |
| MOV A,M | Update smallest |
| SKIP: DCR C | Decrease count |
| JNZ LOOP | Repeat |
| STA 2100H | Store result |
| HLT | Stop execution |
8. BCD → ASCII
| Instruction | Explanation |
|---|---|
| LDA 2000H | Load BCD value |
| ANI 0FH | Mask upper bits |
| ADI 30H | Add ASCII offset |
| STA 2001H | Store ASCII result |
| HLT | Stop execution |
9. ASCII → BCD
| Instruction | Explanation |
|---|---|
| LDA 2000H | Load ASCII value |
| SUI 30H | Subtract ASCII offset |
| STA 2001H | Store BCD result |
| HLT | Stop execution |