21⟩ Which is the Stack used in 8085?
LIFO (Last In First Out) stack is used in 8085.In this type of Stack the last stored information can be retrieved first.
8085
Home Computer Hardware 8085
“Intel 8085 Interview Questions and Answers will guide us that Intel 8085 is an 8-bit microprocessor introduced by Intel in 1977. It was binary-compatible with the more-famous Intel 8080 but required less supporting hardware, thus allowing simpler and less expensive microcomputer systems to be built. So learn more about Intel 8085 with the help of this Intel 8085 Interview Questions with Answers guide and get preparation for hardware based”
39 8085 Questions And Answers
22⟩ How many logical drives is it possible to fit onto a physical disk?
Maximum of 24 logical drives. The extended partition can only have 23 logical drives.
there can be any number of logical drives
23⟩ What is the logical difference b/w Move A TO B and COMPUTE B = A?
In case of Move A TO B it will move whatever the value of a in to b.
it mean it will move numeric, alphanumeric and alphabatic value.
In case of COMPUTE B = A it will assign the vale of a in to b.
but in case of compute only numeric value will be compute.
mov a,b Ans- means whatever the data present on the 'b' it will transfer into 'a'
24⟩ How many interrupts are there in 8085?
There are 12 interrupts in 8085.
25⟩ What is the RST for the TRAP?
RST 4.5 is called as TRAP.
26⟩ What is Tri-state logic?
Three Logic Levels are used and they are High, Low, High impedance state. The high and low are normal logic levels & high impedance state is electrical open circuit conditions. Tri-state logic has a third line called enable line.
27⟩ What are Software interrupts?
RST0,
RST1,
RST2,
RST3,
RST4,
RST5,
RST6,
RST7.
28⟩ What is Stack Pointer?
Stack pointer is a special purpose 16-bit register in the Microprocessor, which holds the address of the top of the stack.
29⟩ Which interrupt has the highest priority?
TRAP has the highest priority
there are 2 types of interrupts external and internal.NMI has highest priority among all external interrupts,TRAP has highest priority among all internal interrupts.
30⟩ What are Hardware interrupts?
TRAP,
RST7.5,
RST6.5,
RST5.5,
INTR
31⟩ What is the strength of the signal transmitted by powerful cell phones?
The powerful cell phones can transmit a signal of 3 watts.
32⟩ Can 8259 be interfaced with 8085 via the trap pin?
i think yes...so if 8259 gives interrupt then it will be serviced immediately but since inta pin is left hanging the insr bit will never be set...and so whenever ny interrupt occurs depending upon priority itt will be serviced....also the isr address for all interrupts will be same ie 0024H...
Interrupt via trap is nonmaskable,so it will be serviced immediately.
33⟩ In 8085 name the 16 bit registers?
Stack pointer and Program counter all have 16 bits.
34⟩ What does Quality factor mean?
The Quality factor is also defined, as Q. So it is a number, which reflects the lossness of a circuit. Higher the Q, the lower are the losses.
the quality factor is measurement of efficiency(or effectiveness) of a device or circuitry.In literal sense quality factor means qualitative performance of a device.
35⟩ What is Program counter in 8085?
Program counter holds the address of either the first byte of the next instruction to be fetched for execution or the address of the next byte of a multi byte instruction, which has not been completely fetched. In both the cases it gets incremented automatically one by one as the instruction bytes get fetched. Also Program register keeps the address of the next instruction.
36⟩ Name 5 different addressing modes?
Immediate,
Direct,
Register,
Register indirect,
Implied addressing modes.
37⟩ What is clock frequency for 8085?
3 MHz is the maximum clock frequency for 8085.
38⟩ Which interrupt is not level-sensitive in 8085?
RST 7.5 is a raising edge-triggering interrupt.
TRAP
39⟩ What are the various flags used in 8085?
Sign flag, Zero flag, Auxillary flag, Parity flag, Carry flag.
