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Microprocessor Interview Questions and Answers
What’s the speed and device
maximum specs for Firewire?
IEEE 1394 (Firewire) supports the maximum of 63 connected devices with speeds up
to 400 Mbps. Where’s MBR located on the disk? Main Boot Record is located in
sector 0, track 0, head 0, cylinder 0 of the primary active partition.
Where does CPU Enhanced mode
originate from?
Intel’s 80386 was the first 32-bit processor, and since the company had to
backward-support the 8086. All the modern Intel-based processors run in the
Enhanced mode, capable of switching between Real mode (just like the real 8086)
and Protected mode, which is the current mode of operation.
How many bit combinations
are there in a byte?
Byte contains 8 combinations of bits.
Have you studied buses? What
types?
There are three types of buses.
Address bus: This is used to carry the Address to the memory to fetch either
Instruction or Data.
Data bus : This is used to carry the Data from the memory.
Control bus : This is used to carry the Control signals like RD/WR, Select etc.
What is the Maximum clock
frequency in 8086?
5 Mhz is the Maximum clock frequency in 8086.
What is meant by Maskable
interrupts?
An interrupt that can be turned off by the programmer is known as Maskable
interrupt.
What is Non-Maskable
interrupts?
An interrupt which can be never be turned off (ie. disabled) is known as
Non-Maskable interrupt
What are the different
functional units in 8086?
Bus Interface Unit and Execution unit, are the two different functional units in
8086.
What are the various segment
registers in 8086?
Code, Data, Stack, Extra Segment registers in 8086.
What does EU do?
Execution Unit receives program instruction codes and data from BIU, executes
these instructions and store the result in general registers.
Which Stack is used in 8086?
k 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.
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.
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.
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