Problem – Write a program to add two 16-bit numbers where starting address is 2000 and the numbers are at 3000 and 3002 memory address and store result into 3004 and 3006 memory address.
Example –
Algorithm –
- Load 0000H into CX register (for carry)
- Load the data into AX(accumulator) from memory 3000
- Load the data into BX register from memory 3002
- Add BX with Accumulator AX
- Jump if no carry
- Increment CX by 1
- Move data from AX(accumulator) to memory 3004
- Move data from CX register to memory 3006
- Stop
Program –
| Memory |
Mnemonics |
Operands |
Comment |
| 2000 |
MOV |
CX, 0000 |
[CX] <- 0000 |
| 2003 |
MOV |
AX, [3000] |
[AX] <- [3000] |
| 2007 |
MOV |
BX, [3002] |
[BX] <- [3002] |
| 200B |
ADD |
AX, BX |
[AX] <- [AX] + [BX] |
| 200D |
JNC |
2010 |
Jump if no carry |
| 200F |
INC |
CX |
[CX] <- [CX] + 1 |
| 2010 |
MOV |
[3004], AX |
[3004] <- [AX] |
| 2014 |
MOV |
[3006], CX |
[3006] <- [CX] |
| 2018 |
HLT |
|
Stop |
Explanation –
- MOV is used to load and store data.
- ADD is used to add two numbers where their one number is in accumulator or not.
- JNC is a 2-bit command which is used to check whether the carry is generated from accumulator or not.
- INC is used to increment an register by 1.
- HLT is used to stop the program.
- AX is an accumulator which is used to load and store the data.
- BX, CX are general purpose registers where BX is used for storing second number and CX is used to store carry.
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Last Updated :
22 May, 2018
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