CS401 Quiz

CS401 Computer Architecture and Assembly Language Quiz No.2 May 02, 2012

Q2. of 10 ( Start time: 05:33:39 PM)

A _____ is an area of memory that holds all local variables and parameters used by any function and remembers the order in which functions are called so that function returns occur correctly.

Instruction Pointer

Stack

OK

Data Segment

Base Register

True

False

Q2. of 10 ( Start time: 03:17:23 PM ) Total Marks: 1

How many characters standard ASCII has?

During the CALL operation, the current value of the instruction pointer is automatically saved on the stack, and the destination of CALL is loaded in the instruction pointer.

True

False

VGA stands for

Video Graphic Accumulator

Video Graphics Adapter

Visual Graphics Adapter Video Graphics Application

Video Graphics Adapter ________ transfers the word at the current top of stack (pointed to by SP) to the destination operand and then increments SP by two to point to the new top of stack.

PUSH

POP

CALL

screen at:

The Operation of pop ax is AX <-- [SP] SP <-- SP-2

True

False

_______ function decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack now pointed to by SP.

POP

PUSH

RET ADD Far calls are called intra segment calls.

True

False

STOS is often used to clear a block of memory or fill it with a constant.

True

False How many characters were defined by standard ASCII?

Stack clearing by the caller needs an extra instruction on behalf of the caller after every call made to the subroutine, unnecessarily increasing instructions in the program.

True

False

The direction of movement is controlled with the _________________in the flags register. If this flag is cleared the direction is from lower addresses towards higher addresses and if this flag is set the direction is from higher addresses to lower addresses.

ASCII stands for____________________________.

American Standard Code for Information Interaction

American Standard Code for Information Interchange

American Standard Communication for Integer Interchange American Scientific Communication for Integer Interaction During the CALL operation, the current value of the instruction pointer is automatically saved on the stack, and the destination of CALL is loaded in the instruction pointer.

Extended ASCII has 256 characters with assigned numbers from

1 to 255 0 to 256