8086 Questions and Answers

1. Describe segmentation & pipelining in 8086.
2. What is the difference between 8085 and 8086 and 80286?
3. What is the Maximum clock frequency in 8086?
   #5 Mhz is the Maximum clock frequency in 8086.
4. 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.
5. What are the various interrupts in 8086?
   #Maskable interrupts, Non-Maskable interrupts.
6. What is meant by Maskable interrupts?
   #An interrupt that can be turned off by the programmer is known as Maskable interrupt.
7. What is Non-Maskable interrupts?
   #An interrupt which can be never be turned off (ie.disabled) is known as Non-Maskable interrupt.
8. Which interrupts are generally used for critical events?
   #Non-Maskable interrupts are used in critical events. Such as Power failure, Emergency, Shut off etc.,
9. Which microprocessor accepts the program written for 8086 without any changes?
   #8088 is that processor.
10. 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.
11. What does EU do?
    #Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.
12. 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.
13. 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.
14. What is meant by cross-compiler?
    #A program runs on one machine and executes on another is called as cross-compiler.
15. What are the different functional units in 8086?
    #Bus Interface Unit and Execution unit, are the two different functional units in 8086.
16. Logic calculations are done in which type of registers?
    #Accumulator is the register in which Arithmetic and Logic calculations are done.
17. What is the position of the Stack Pointer after the POP instruction?
    #The address line is 02 greater than the earlier value.
18. What is the position of the Stack Pointer after the PUSH instruction?
    #The address line is 02 less than the earlier value.
19. Which is the tool used to connect the user and the computer?
    #Interpreter is the tool used to connect the user and the tool.