CS401-Midterm
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When an item is pushed on the decrementing stack, the top of the stack is
2 / 50
mov ax,5 has
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After the execution of REP instruction CX will be decremented then which of the following flags will be affected?
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In STOSB instruction, when DF is Set, SI is
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If the direction of the processing of a string is from higher addresses towards lower addresses then
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The second byte in the word designated for one screen location holds
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physical address of the stack is obtained by
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Which bit of the attributes byte represents the blue component of background color ?
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8088 is a 16bit processor with its accumulator and all registers of __________.
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The routine that executes in response to an INT instruction is called
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The first instruction of “COM” file must be at offset:
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The prevalent convention in most high level languages is stack clearing by the
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The basic function of SCAS instruction is to
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Assembly language is:
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The physical address of the stack is obtained by
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17 / 50
In STOS instruction, the implied source will always be in
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In assembly the CX register is used normally as a ______________register.
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Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
20 / 50
Each screen location corresponds to a word, the lower byte of this word contains ____
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To convert any digit to its ASCII representation
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Which of the following options contain the set of instructions to open a window to the video memory?
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one RET is executed, it recovers the values from
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The iAPX888 architecture consists of _______ register.
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ASCII stands for ____________. The screen is two dimensional space having:
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27 / 50
Which bit of the attributes byte represents the red component of background color ?
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After the execution of STOSW the CX will be
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Code Segment is associated to _______ register by default.
30 / 50
When a 16 bit number is divided by an 8 bit number, the quotient will be in
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32 / 50
In the instruction “CMP AX,BX” the contents of
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34 / 50
To transfer control back the RET instruction take
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which bit sets the character "blinking" on the screen?
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The instruction ADC has________ Operand(s)
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decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack
38 / 50
In 8088 architecture, whenever an element is pushed on the stack
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40 / 50
After the execution of “PUSH AX” statement
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When a very large number is divided by very small number so that the quotient is larger than the space provided, this is called
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All the addressing mechanisms in iAPX88 return a number called _____________ address.
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Which bit of the attributes byte represents the blue component of foreground color
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Stack is a ______ that behaves in a first in last out manner.
45 / 50
The maximum parameters a subroutine can receive (with the help of registers) are
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One screen location corresponds to a
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if ax contains decimal -2 and BX contains decimal 2 then after the execution of instructions: CMP AX, BX ,JA label
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After the execution of SAR instruction:
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RETF will pop the offset in the
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After the execution of instruction “RET”
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