PROGRAM NO.3
OBJECT:Write a program to find the greatest number from an array of 10 numbers.
INSTRUMENT REQUIRED: 8086 Microprocessor Trainer Kit.
PROGRAM:
| MEMORY LOCATION | MACHINE CODE | OPCODE | OPERAND |
| 020B | B1 09 | MOV | CL,09H |
| 020D | BE 00 02 | MOV | SI,0200H |
| 0210 | 8A 04 | MOV | AL,[SI] |
| 0212 | 46 | L1 : INC | SI |
| 0213 | 3A 04 | CMP | AL,[SI] |
| 0215 | 73 02 | JNB L2 | |
| 0217 | 8A 04 | MOV | AL,[SI] |
| 0219 | FE C9 | L2 : DEC | CL |
| 021B | 75 F5 | JNZ L1 | |
| 021D | BF 0A 02 | MOV | DI,020AH |
| 0220 | 88 05 | MOV | [DI],AL |
| 0222 | F4 | HLT |
DESCRIPTION:
To solve the given objective, we have taken ten hexadecimal numbers in the memory locations from 0200H and 0209H. In order to find the greatest number amongst them we need to compare each number with the other. The greatest number will be stored in the memory location 020AH.
To solve the given objective, we have taken the following steps:
- Initially we initialize the counter register CL to 9 because the number of comparisons with any one number would be 9. In other words, it will compare 9 times.
- Move the source index register (SI) pointer to the location of the first number.
- Store the first number in the Al register using SI.
- Initiate a loop and compare each element with the element stored in AL while simultaneously decrementing counter CL.
- If the number is greater than that stored in AL then we store that number in AL else we do not change the value in AL.
- The above mentioned process goes on until CL becomes zero, at this point we have the greatest number in the AL register.
- Move the destination index (DI) pointer to point to the memory location where the result is to be stored.
- Finally move the result from the AL register to the destination using DI and Halt.
INPUT VALUE:
| MEMORY LOCATION | VALUE |
| 0200H | A1 |
| 0201H | B1 |
| 0202H | C1 |
| 0203H | D1 |
| 0204H | E1 |
| 0205H | E2 |
| 0206H | E3 |
| 0207H | E4 |
| 0208H | E5 |
| 0209H | E6 |
| 020AH | 00 |
OUTPUT:
| MEMORY LOCATION | VALUE |
| 020AH | E6 |
RESULT:The greatest of the 10 hexadecimal numbers is E6H, which gets stored in the memory location 020AH.
COMMENTS:
1. INC SI: The content of a specified 8-bit or 16-bit register or memory location(s) is incremented by one by this instruction.
2. CMP AL,[SI]: The compare instruction compares two specified operands. For comparison one operand is subtracted from the other.
3. JNC: It causes the program execution to jump to the label given in the instruction.
4. HLT: This instruction stops program execution. The processor stops fetching and executing instructions.
FLOWCHART:
Most Important Question for Exam
1. BCD Stand for:
Binary Code Decimal
2. Which use to store critical pieces of data during subroutines and interrupts:
Stack
3. The Calculator is 16 bit wide and is called:
AX
4. How many bits the instruction pointer is wide:
16 bit
5. The size of each segment in 8086 is:
64 kb
6. The ___________ address of memory 20 bit address for the 8086 Microprocessor:
Physical
7. The PIN configuration of 8086 is available in the _______
40 Pin
8. DIP stand for:
Dual inline package
9. BP Stand for:
Base Pointer
10. DI Stand for:
Destination Index register
11. SI Stand for:
Source Index
12. ALE Stand for:
Address Latche Enable
13. NMI Stand for:
Non Mask able Interrupt
14. ____________ is the most important segment and it contains the actual assembly language instruction to be executed by the Microprocessor
Code Segment
15. The offset of a particular segment varies from ______________:
0000H to FFFFH
16. Which are the factor of cache memory
Properties of the programs being executed
17. _________ is usually the first level of memory by the Microprocessor:
Cache Memory
18. Which is the small amount of high-speed memory used to work directoly with the Microprocessor:
Cache
19. The cache usually gets its data from the _____________ whenever the instruction or data is required by the CPU:
Main Memory
20. Microprocessor reference that are available in the cache are called___________:
Cache Hits
21. Microprocessor reference that are not available in the cache are called____________:
Cache Misses
22. Which causes the Microprocessor to immediately its present activity:
RESET Signal
23. Which is responsible for all the outside world communiction by the Microprocessor:
BIU
24. INTR: it implies the ___________ signal:
Interrupts Request
25. Which of the following are the two main components of the CPU?
Control Unit and ALU
26. Different components the Motherboard of a PC unite are linked togther by sets of parallel eletrical conducting lines. What are these lines called?
Buses
27. The Language that the Computer can understand execute is called
Machine Language
28. Which of the following is used as a primary storage device?
PROM
29. Which of the following memories needs refresh?
DRAM
30. The memory which is programmed at the time is manufacturerd
PROM
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