Q. A processor that has carry, overflow and sign flag bits as part of its program status word (PSW) performs addition of the following two 2's complement numbers 01001101 and 11101001. After the execution of this addition operation, the status of the carry, overflow and sign flags, respectively will be:

View solution

Q. The complement of the function F = (A + B’)(C’ + D)(B’ + C) is:

View solution

Q. To put the 8085 microprocessor in the wait state

View solution

Q. Comparing the time T1 taken for a single instruction on a pipelined CPU with time T2 taken on a non­ pipelined but identical CPU, we can say that

View solution

Q. The 8085 microprocessor responds to the presence of an interrupt

View solution

Q. The most appropriate matching for the following pairs

X: Indirect addressing 1 : Loops

Y: Immediate addressing 2 : Pointers

Z: Auto decrement addressing 3: Constants

is

View solution

Q. Consider the values A = 2.0 x 10^30, B =-2.0 x 10^30, C= 1.0, and the sequence

X: = A + B Y: = A + C
X: = X + C Y: = Y + B

executed on a computer where floating-point numbers are represented with 32 bits. The values for X and Y will be

View solution

Q. A low memory can be connected to 8085 by using

View solution

Q. Suppose a processor does not have any stack pointer register. Which of the following statements is true?

View solution

Q. A processor needs software interrupt to

View solution

Q. A CPU has two modes-privileged and non-privileged. In order to change the mode from privileged to non-privileged

View solution

Q. Which is the most appropriate match for the items in the first column with the items in the second column:

X. Indirect Addressing I. Array implementation
Y. Indexed Addressing II. Writing re-locatable code
Z. Base Register Addressing III. Passing array as parameter

View solution

Q. The 2’s complement representation of (−539)10 in hexadecimal is

View solution

Q. A device employing INTR line for device interrupt puts the CALL instruction on the data bus while

View solution

Q. In 8085, which of the following modifies the program counter ?

View solution

Q. The 2' s complement representation of the decimal value - 15 is

View solution

Q. Sign extension is a step in

View solution

Q. In 2' s complement addition, overflow

View solution

Q. In the absolute addressing mode

View solution

Q. What are the states of the Auxiliary Carry (AC) and Carry Flag (dCY) after executing the following 8085 program?

MVI L, 5DH
MVI L, 6BH
MOV A, H
ADD L

View solution