GATE ECE

Instruction Set and Programming With 8085

Microprocessors

(Past Years Questions)

Marks 1

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The clock frequency of an 8085 microprocessor is 5 MHz. If the time required to execute an instruction is 1.4 $$\mu $$s,...
GATE ECE 2017 Set 1
In an 8085 microprocessor, the contents of the accumulator and the carry flag are A7 (in hex) and 0, respectively. If th...
GATE ECE 2016 Set 3
Which one of the following 8085 microprocessor programs correctly calculates the product of two 8-bit numbers stored in ...
GATE ECE 2015 Set 3
In an 8085 microprocessor, which one of the following instructions changes the content of the accumulator?
GATE ECE 2015 Set 2
In an 8085 microprocessor, the shift registers which store the result of an addition and the overflew bit are, respectiv...
GATE ECE 2015 Set 1
For 8085 microprocessor, the following program is executed. At the end of program, accumulator contains...
GATE ECE 2013
An instruction used to set the carry flag in a computer can be classified as
GATE ECE 1998
The following instructions have been executed by an 8085 $$\mu $$P From which address will be text instruction be fetc...
GATE ECE 1997
The following sequence of instructions are executed by an 8085 microprocessor: 1000: LXI SP 1003: CALL 1006 1006: POP ...
GATE ECE 1996
The total number of memory accesses involved (inclusive of the op-code fetch) when an 8085 processor executes, the instr...
GATE ECE 1996
An 'Assembler' for a microprocessor a used for
GATE ECE 1995
In a microprocessor, the register which holds the address of the next instruction to be fetched is
GATE ECE 1993
The following program is run on 8085 microprocessor: At the completion of execution of the program, the program Count...
GATE ECE 1992
In a microprocessor system, the stack is used for
GATE ECE 1989
In register index addressing mode the effective address is given by
GATE ECE 1988

Marks 2

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The following five instructions were executed on an 8085 microprocessor. MVI A, 33H MVI B, 78H ADD B CMA ANI 32H...
GATE ECE 2017 Set 1
In an 8085 system, a PUSH operation requires more clock cycles than a POP operation. Which one of the following options ...
GATE ECE 2016 Set 1
An 8085 microprocessor executes “STA 1234H” with starting address location 1FFEH (STA copies the contents of the Accumu...
GATE ECE 2014 Set 4
An 8085 assembly language program is given below. Assume that the carry flag is initially unset. The content of the accu...
GATE ECE 2011
For the 8085 assembly language program given below, the content of the accumulator after the executions of the program i...
GATE ECE 2010
An 8085 executes the following instructions 2710 LXI H, 30A0H DAD H PCHL All addresses and constants are in Hex. L...
GATE ECE 2008
An 8085 assembly language program is given below. Line 1: MVI A, B5H 2: MVI B, 0EH 3: XRI 69H 4: ADD B 5: ANI 9BH ...
GATE ECE 2007
An 8085 assembly language program is given below. Line 1: MVI A, B5H 2: MVI B, 0EH 3: XRI 69H 4: ADD B 5: ANI 9BH ...
GATE ECE 2007
Following is the segment of a 8085 assembly Language program: LXI SP, EFFF H CALL 3000 H 3000H: LXI H, 3CF4H PUSH P...
GATE ECE 2006
Consider an 8085 microprocessor system The following program starts at locaton 0100H. LXI SP, 00FF LXI H, 0107 MVI...
GATE ECE 2005
Consider an 8085 microprocessor system If in addition following code exists from 0109H onwards ORI 40H, ADD M What wi...
GATE ECE 2005
The number of memory cycles required to execute the following 8085 instructions (I.) LDA 3000H (II.) LXI D, FOF 1H W...
GATE ECE 2004
It is desired to multiply the numbers 0AH by 0BH and store the result in the accumulator. The numbers are available in r...
GATE ECE 2004
Consider the sequence of 8085 instructions given below. LXI H, 9258 MOV A, M CMA MOV M, A Which one of the follo...
GATE ECE 2004
In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than tha...
GATE ECE 2003
The contents of Register (B) and Accumulator (A) of 8085 microprocessor are 49H and 3AH respectively. The contents of A ...
GATE ECE 2002
Consider the following assembly language program. The execution of the above program in an 8085 microprocessor will r...
GATE ECE 2002

Marks 5

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Write down the sequence of Instructions which are actually (till HLT instruction), if the program begins with the locati...
GATE ECE 1994
The program given below is run on an 8085 based microcomputer system. Determine the contents of the registers: PC, SP, B...
GATE ECE 1991

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