PART-A
1. What are the various registers in 8085?
2. In 8085 name the 16 bit registers?
3. What are the various flags used in 8085?
4. What is Stack Pointer?
5. What is Program counter?
6. Which Stack is used in 8085?
7. What happens when HLT instruction is executed in processor?
8. What is meant by a bus?
9. What is Tri-state logic?
10. Give an example of one address microprocessor?
11. In what way interrupts are classified in 8085?
12. What are Hardware interrupts?
13. What are Software interrupts?
14. Which interrupt has the highest priority?
15. Name 5 different addressing modes?
16. How many interrupts are there in 8085?
17. What is clock frequency for 8085?
18. What is the RST for the TRAP?
19. In 8085 which is called as High order / Low order Register?
20. What are input & output devices?
21. Can an RC circuit be used as clock source for 8085?
22. Why crystal is a preferred clock source?
23. Which interrupt is not level-sensitive in 8085?
24. What does Quality factor mean?
25. What are level-triggering interrupt?
26. What is Program Counter?
Define indirect addressing mode and give an example.
What is the use of ALE signal?
List any four unconditional branch instructions
What is the use of HOLD and HLDA signals?
Write about multiplexing of 8085 address bus.
What are the various registers available in 8085?
What is the mechanism of stack?
Name the functional groups under which 8085 instructions are classified.
Compare Assembly language with High level language.
Define Assembler
How many bytes are there in the range B250H to DFFFH
What is a Flag?
What is Program Status Word?
What are the advantages of DRAM?
Define Coprocessor.
What is Assembler Directive? Give examples.
Write about salient features of 8086.
Explain how a 20 bit effective address is generated in 8086.
45.What is the purpose of MN / MX pin in 8086?
PART B
1. Draw the functional block diagram of 8085 microprocessor and explain.
2. Write a Program to Perform the following functions and verify the output steps:
(i) Load the number 5CH in register D
(ii) Load the number 9E H in register C
(iii) Increment the Contents of register C by one.
(iv) Add the contents of register C and D and Display the sum at output
port1.
3. Write an assembly language program to find out the largest number from a given
unordered array of 8 bit numbers, stored in the locations starting from a known
address.
4. With suitable examples explain 8085 instruction set in detail.
5. With suitable examples explain 8085 addressing modes in detail.
6. Explain 8085 Stack in detail.
7. Write a 8085 ALP to generate a accurate time delay of 100ms.
8. Describe Intel 8086 Microprocessor Architecture
9. Describe any five addressing modes of 8086 with suitable examples.
10. Write a 8086 ALP to convert an 8 bit binary number into equivalent gray code.
11. Explain the function of all the pins of 8085 Processor.
12. Write a 8086 ALP to sort an array of ten bytes in ascending order. Add comments
to your Program.
13. Explain the function of various flags of 8086 microprocessor.
14. Write short notes on the following multiprocessor configurations
i) Shared bus configuration ii) Multiport Memory Configurations
15 Explain the function of unsigned multiplication and Division instructions in
8086 with suitable examples.
16 With a neat block diagram, explain in detail the internal architecture of 8255
and its registers.
17. Describe the functional units present and their functions in BIU and EU of
8086.
18.What is addressing mode? Describe the addressing modes in 8085 with suitable
Examples. 8 Marks
19. Write 8085 assembly language program to SORT an array of 10 bytes in
Descending order. 8 Marks
20.Write 8086 assembly language program to perform the following
a. To move a string of words from offset 1000h to offset 6000h. The
Length of the string is 0Ch. 8 Marks
b. To add an array of bytes. The array contains 50bytes. 8 Marks
21.Explain 8085 stack in detail
8086 (microprocessor):
1) How many bit 8086 microprocessor is?
2) What is the size of data bus of 8086?
3) What is the size of address bus of 8086?
4) What is the max memory addressing capacity of 8086?
5) Which are the basic parts of 8086?
6) What are the functions of BIU?
7) What are the functions of EU?
8) How many pin IC 8086 is?
9) What IC8086 is?
10) What is the size of instruction queue in 8086?
11) What is the size of instruction queue in 8088?
12) Which are the registers present in 8086?
13) What do you mean by pipelining in 8086?
14) How many 16 bit registers are available in 8086?
15) Specify addressing modes for any instruction?
16) What do you mean by assembler directives?
17) What .model small stands for?
18) What is the supply requirement of 8086?
19) What is the relation between 8086 processor frequency & crystal
frequency?
20) Functions of Accumulator or AX register?
21) Functions of BX register?
22) Functions of CX register?
23) Functions of DX register?
24) How Physical address is generated?
25) Which are pointers present in this 8086?
26) Which is by default pointer for CS/ES?
27) How many segments present in it?
28) What is the size of each segment?
29) Basic difference between 8085 and 8086?
30) Which operations are not available in 8085?
31) What is the difference between min mode and max mode of 8086?
32) What is the difference between near and far procedure?
33) What is the difference between Macro and procedure?
34) What is the difference between instructions RET & IRET?
35) What is the difference between instructions MUL & IMUL?
36) What is the difference between instructions DIV & IDIV?
37) What is difference between shifts and rotate instructions?
38) Which are strings related instructions?
39) Which are addressing modes and their examples in 8086?
40) What does u mean by directives?
41) What does u mean by Prefix?
42) What .model small means?
43) Difference between small, medium, tiny, huge?
44) What is dd, dw, db?
45) Interrupts in 8086 and there function.
46) What is the function of 01h of Int 21h?
47) What is the function of 02h of Int 21h?
48) What is the function of 09h of Int 21h?
49) What is the function of 0Ah of Int 21h?
50) What is the function of 4ch of Int 21h?
51) What is the reset address of 8086?
52) What is the size of flag register in 8086? Explain all.
53) What is the difference between 08H and 01H functions of INT 21H?
54) Which is faster- Reading word size data whose starting address is at
even or at odd address of memory in 8086?
55) Which are the default segment base: offset pairs?
56) Can we use SP as offset address holder with CS?
57) Which are the base registers in 8086?
58) Which is the index registers in 8086?
59) What do you mean by segment override prefix?
60) Whether micro reduces memory requirements?
61) What do you mean by macro?
62) What is diff between macro and procedure?
63) Types of procedure?
64) What TASM is?
65) What TLINK is?
66) What TD is?
67) What do u mean by assembler?
68) What do u mean by linker?
69) What do u mean by loader?
70) What do u mean by compiler?
71) What do u mean by emulator?
72) Stack related instruction?
73) .stack 100 means?
74) What do you mean by 20 dup (0)?
75) Which flags of 8086 are not present in 8085?
76) What is the size of flag register?
77) Can you perform 32 bit operation with 8086? How?
78) Whether 8086 is compatible with Pentium processor?
79) What is 8087? How it is different from 8086?
80) While accepting no. from user why u need to subtract 30 from that?
81) While displaying no. from user why u need to add 30 to that?
82) What are ASCII codes for nos. 0 to F?
83) How does U differentiate between positive and negative numbers?
84) What is range for these numbers?
85) Which no. representation system you have used?
86) What is LEA?
87) What is @data indicates in instruction- MOV ax, @data?
88) What is maximum size of the instruction in 8086?
89) Why we indicate FF as 0FF in program?
90) What is mul BX and div BX? Where result goes?
91) Where queue is present?
92) What is the advantage of using internal registers?
93) What is SI, DI and their functions?
94) Which are the pointers used in 8086 and their functions?
95) What is a type of queue in 8086?
96) What is minimum mode of 8086?
97) What is maximum mode of 8086?
98) Which are string instructions?
99) In string operations which is by default string source pointer?
100) In string operations which is by default string destination pointer?
PROGRAMS:
1) What do you mean by assembler?
2) What do you mean by linker?
3) What do you mean by debugger?
4) What do you mean by compiler?
5) What do you mean by locator?
6) What do you mean by emulator?
7) When divide overflow error occurs?
8) What .startup stands for?
9) Explain the logic of array addition program.
10) Explain the logic of finding out negative nos. from an array of signed
nos.
11) Explain the logic of code conversion (BCD to hex and hex to BCD)
program.
12) Explain the logic of multiplication (by successive addition and shift and
add method) program.
13) Explain the logic of non overlap and overlap block transfer program
14) Explain the logic of string related programs.
15) Which assembler directives are used with near procedure?
16) Which assembler directives are used with far procedure?
INTERRUPTS:
1) What do you mean by interrupt?
2) Which are the hardware and software interrupts in 8086?
3) Mention the priority of interrupts in8086.
4) What is int1, int2, int3?
5) What do you mean by NMI interrupt?
6) What do you mean by IVT in 8086?
7) What is the size of IVT?
8) Where IVT is located?
9) Which steps 8086 follows to handle any interrupt?
INTERFACING:
1) What are the types of interfacing?
2) Compare memory interfacing and IO interfacing.
3) What are the types of IO interfacing?
4) What is the difference between direct and indirect IO interfacing?
5) What is the difference between memory mapped IO and IO mapped IO
interfacing?
8255 (programmable peripheral interface) :
1) What IC 8255 is?
2) How many pin IC 8255 is?
3) Explain control word format of 8255?
1.What are the flags in 8086?
- In 8086 Carry flag, Parity flag, Auxiliary carry flag, Zero flag, Overflow flag, Trace
flag, Interrupt flag, Direction flag, and Sign flag.
2.What are the various interrupts in 8086?
- Maskable interrupts, Non-Maskable interrupts.
3.What is meant by Maskable interrupts?
- An interrupt that can be turned off by the programmer is known as Maskable interrupt.
4.What is Non-Maskable interrupts?
An interrupt which can be never be turned off (ie.disabled) is known as Non-Maskable
interrupt.
5.Which interrupts are generally used for critical events?
- Non-Maskable interrupts are used in critical events. Such as Power failure, Emergency,
Shut off etc.,
6.Give examples for Maskable interrupts?
- RST 7.5, RST6.5, RST5.5 are Maskable interrupts
7.Give example for Non-Maskable interrupts?
- Trap is known as Non-Maskable interrupts, which is used in emergency condition.
8.What is the Maximum clock frequency in 8086?
- 5 Mhz is the Maximum clock frequency in 8086.
9.What are the various segment registers in 8086?
- Code, Data, Stack, Extra Segment registers in 8086.
10.Which Stack is used in 8086?
- FIFO (First In First Out) stack is used in 8086.In this type of Stack the first stored
information is retrieved first.
11.What are the address lines for the software interrupts? -
12.What is SIM and RIM instructions?
- SIM is Set Interrupt Mask. Used to mask the hardware interrupts. RIM is Read
Interrupt Mask. Used to check whether the interrupt is Masked or not.
13.Which is the tool used to connect the user and the computer?
- Interpreter is the tool used to connect the user and the tool.
14.What is the position of the Stack Pointer after the PUSH instruction?
- The address line is 02 less than the earlier value.
15.What is the position of the Stack Pointer after the POP instruction?
- The address line is 02 greater than the earlier value.
16.Logic calculations are done in which type of registers?
- Accumulator is the register in which Arithmetic and Logic calculations are done.
17.What are the different functional units in 8086?
- Bus Interface Unit and Execution unit, are the two different functional units in 8086.
18.Give examples for Micro controller?
- Z80, Intel MSC51 &96, Motorola are the best examples of Microcontroller.
19.What is meant by cross-compiler?
- A program runs on one machine and executes on another is called as cross-compiler.
20.What are the address lines for the hardware interrupts? -
21.Which Segment is used to store interrupt and subroutine return address registers?
- Stack Segment in segment register is used to store interrupt and subroutine return
address registers.
22.Which Flags can be set or reset by the programmer and also used to control the
operation of the processor?
- Trace Flag, Interrupt Flag, Direction Flag.
23.What does EU do?
- Execution Unit receives program instruction codes and data from BIU, executes these
instructions and store the result in general registers.
24.Which microprocessor accepts the program written for 8086 without any changes?
- 8088 is that processor.
25.What is the difference between 8086 and 8088?
- The BIU in 8088 is 8-bit data bus & 16- bit in 8086.Instruction queue is 4 byte long in
8088and 6 byte in 8086.
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