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8085 Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM COMPUTER HARDWARE INTERVIEW QUESTIONS 8085 INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

8085 Interview Questions & Answers - Learning Mode

The Intel 8085 is an 8-bit microprocessor manufactured by Intel in the mid-1970s. 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.

Try 8085 Interview Questions & Answers - Exam Mode

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8085 Interview Questions & Answers - Learning Mode
Try 8085 Interview Questions & Answers - Exam Mode
Question: Can an RC circuit be used as clock source for 8085?

Answer: Yes, it can be used, if an accurate clock frequency is not required. Also, the component cost is low compared to LC or Crystal. Source: CoolInterview.com
Question: Difference between memory mapped IO and IO mapped IO?

Answer: Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other. Source: CoolInterview.com
Question: What is machine cycle,instruction cycle and T-state?

Answer: Machine Cycle:The necessary steps to a fetch,a read or a write operation constitute a Machine cycle.

Instruction Cycle:The necessary steps that a CPU carries out to fetch an instruction and necessary data from the memory,and to execute it constitute an Instruction Cycle.

T-state:One sub-division of an operation performed in one clock cycle is called a T-state. Source: CoolInterview.com
Question: In 8085 name the 16 bit registers?

Answer: Stack pointer and Program counter all have 16 bits. Source: CoolInterview.com
Question: What are Hardware interrupts?

Answer: TRAP, RST7.5, RST6.5, RST5.5, INTR Source: CoolInterview.com
Question: Which Stack is used in 8085?

Answer: LIFO (Last In First Out) stack is used in 8085.In this type of Stack the last stored information can be retrieved first. Source: CoolInterview.com
Question: What is clock frequency for 8085?

Answer: 3 MHz is the maximum clock frequency for 8085. Source: CoolInterview.com
Question: Which interrupt has the highest priority?

Answer: TRAP has the highest priority Source: CoolInterview.com
Question: How can we read/write structures from/to data files?

Answer:
Question: What is the difference between program counter and stack pointer?
What is the difference between data and address?
What are the difference between memory and memory location?


Answer: Program counter is a register which holds the address of next instruction when the current instruction is under execution while stack pointer is a pointer which points to the top element of the stack.Data is a value which we use in the execution of instruction. Data value can be manipulated. while a address is the some constant value to a particular memory location which the help of address of memory location we can access the data present in the memory.
Memory is a data storage device which Source: CoolInterview.com
Question: Define interrupt?

Answer: External devices or internal abnormal conditions can interrupt the normal program execution of a microprocessor. Source: CoolInterview.com
Question: What is Program counter?

Answer: 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. Source: CoolInterview.com
Question: What are the various flags used in 8085?

Answer: Sign flag, Zero flag, Auxillary flag, Parity flag, Carry flag. Source: CoolInterview.com
Question: Explain briefly about 8085,8086 ?

Answer: 8085 is a 8 bit micro processor and all registers have a size of 8-bit.the address bus width is 16 lines so it can handle 64kbytes of memory.
8086 is 16 bit microprocessor.address width of 20 lines so it can handle 1Mbyte of memory. Source: CoolInterview.com
Question: What is Intel 8085?Enumerate the different instruction format of 8085 with suitable examples .

Answer: Intel 8085 is an 8-bit microprocessor which is been introduced by Intel in 1977. It was binary and compatible with the famous Intel 8080 but required less supporting hardware, thus allowing simple and less expensive microcomputer systems to be built.

Source: CoolInterview.com
Question: What is DTB ?

Answer: Dynamic Transaction Back-out. A process to recover recoverable resources based on information stored in the Dynamic Log. Source: CoolInterview.com
Question: How do address and data lines are demultiplexed in 8085?

Answer: During the first clock cycle of a memory access, the data lines contain the low order address. External hardware is expected to latch that address on the trailing edge of ALE, Address Latch Enable. During the next clock cycle, the data lines either float (for read, S1=1) or change to data value (for write, S1=0). Source: CoolInterview.com
Question: What action is taken when the processor under execution is interrupted by TRAP in 8085MPU?


a) Processor serves the interrupt request after completing the execution of the current instruction.


b) processor serves the interrupt request after completing the current task.


c) processor serves the interrupt immediately.


d) processor serving the interrupt request depent depends upon the priority of the current task under execution?


Answer: Processor serves the interrupt request after completing the current task. Source: CoolInterview.com
Question: Why should Balance Sheet Tally, explain?

Answer: The liability part of the balance sheet is basically for investment purpose. suppose u take 50000 loan its a liability but it is used for purchasing some asset .... therefore u cant use more that u have.
asset + liabilities= capital Source: CoolInterview.com
Question: How many interrupts are there in 8085?

Answer: There are 12 interrupts in 8085. Source: CoolInterview.com

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