PROGRAM NO.5
OBJECT:Write a program to multiply two 16-bit numbers; result should be greater than 16 bits.
INSTRUMENT REQUIRED: 8086 Microprocessor Trainer Kit.
PROGRAM:
| MEMORY LOCATION | MACHINE CODE | OPCODE | OPERAND |
| 0208 | BE 00 02 | MOV | SI,0200H |
| 020B | 8B 04 | MOV | AX,[SI] |
| 020D | 46 | INC | SI |
| 020E | 46 | INC | SI |
| 020F | 8B 1C | MOV | BX,[SI] |
| 0211 | F7 E3 | MUL | BX |
| 0213 | BF 04 02 | MOV | DI,0204H |
| 0216 | 89 05 | MOV | DI,[AX] |
| 0218 | 47 | INC | DI |
| 0219 | 47 | INC | DI |
| 021A | 89 15 | MOV | [DI],DX |
| 021C | F4 | HLT |
DESCRIPTION:
To solve the given objective we have taken two hexadecimal numbers in the memory locations of 0200H and 0202H and multiplied them and stored the result in the memory location of 0204H and the remaining number in the DX register which is then transferred top the memory location of 0206H.
To solve the given objective we have taken the following steps:
- Move the source index register (SI) pointer to the location of the first number.
- Store the first number in the AX register using SI.
- Double increment the SI pointer to point to the memory location of the next number.
- Store the first number in the BX register using SI.
-
Now apply MUL operation to multiply the numbers in the registers AX and BX and store the result in AXMove the destination index (DI) pointer to point to the memory location where the result is to be stored.
- Move the result from the AX register to the destination using DI.
- Move the destination index (DI) pointer to point to the memory location where the remaining 16 bit number is to be stored.
- Finally move the result from the DX register to the destination using DI and Halt.
INPUT VALUE:
| MEMORY LOCATION | VALUE |
| 0200H | 04 |
| 0201H | 00 |
| 0202H | 08 |
| 0203H | 00 |
| 0204H | 00 |
| 0205H | 00 |
| 0206H | 00 |
| 0207H | 00 |
OUTPUT:
| MEMORY LOCATION | VALUE |
| 0204H | 20 |
| 0205H | 00 |
| 0206H | 00 |
| 0207H | 00 |
RESULT:The multiplication of the two numbers 0004H and 0008H yielded 0020H as the result and 0000H as the remaining bits.
COMMENTS:
- MOV SI, 0200H: 16 bit data can be moved using immediate addressing. 0200 is moved to source index.
- MUL BX: This instruction is used for the multiplication of 2 unsigned numbers. It multiplies the content of BX with AX and stores in AX.
- INC DI: The content of a specified 8-bit or 16-bit register or memory location(s) is incremented by one by this instruction.
- HLT: This instruction stops program execution. The processor stops fetching and executing instructions.
FLOWCHART:
Most Important Question for Exam
1. A directly accesible appointment calender is feature of a…..resident package
Memory
2. The term gigabyte refers to
1024 megabytes
3. Which is the bain of computer
CPU
4. Which technology using the Microprocessor is fabricated on a sigle chip:
MOS
5. CMOS Stand for:
Metal oxide semiconductor
6. In which form CPU provide output:
Digital signals
7. In Microprocessor one of the operand holds a special register called:
Accumulator
8. Which register is a temporary storage location:
B & C
9. PC Stand for
Program Counter
10. The act of accuring instruction is reffered as the _____ the instruction:
Fetching
11. How many bit of instruction on our simple computer consist of one ______:
12-bit
12. How many parts of sigle address computer instruction:
2
13. Single address computer instruction has two parts:
C & D
14. LA stand for:
Load Counter
15. ___________ Stores the instruction currently being executed:
Instruction register
16. The status register is also called the ________:
Both A & B
17. The area of memory wth address near zero are called:
Low Memory
18. The processor user the stack to keep track of where the items are stored on it this by using the:
Stack Pointer Register
19. The 16 bit register is sapreted into groups of 4 bit where each groups is called:
Nibble
20. A nibble can be represented in the from of:
Hexadecimal
21. The left side of any binary number is called:
Most significant digit
22. A 16 bit address can generate _______addresses:
65536
23. CPU can read and write data by using:
Data Bus
24. Which bus transfer from the CPU to external device and oters that carry singles from extran device to the CPU:
Control Bus
25. When memory read or I/O read active data is to the processor:
Input
26. When memory write or I/O read are active data is from the microprocessor:
Output
27. Which are the READ operation can in simple steps:
All of these
28. DMA Stand for:
Direct Memory Access
29. The Microprocessor system by using the __________ device interface:
Both A & B
30. The standard I/O is also called:
Isolated I/O
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