CS401-Midterm
1 / 50
In assembly the CX register is used normally as a ______________register.
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To transfer control back the RET instruction take
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The execution of the instruction “mov word [ES : 0], 0x0741” will print character “A” on screen , background color of the screen will be
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“Far” jump is not position relative but is _______________
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6 / 50
The basic function of SCAS instruction is to
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In the instruction MOV AX, 5 the number of operands are
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When a 16 bit number is divided by an 8 bit number, the dividend will be in
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When an item is pushed on the decrementing stack, the top of the stack is
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The execution of the instruction “mov word [ES : 0], 0x0741” will print character “A” on screen, color of the character will be
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The physical address of the stack is obtained by
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_______ register holds the address of next instruction is to be executed
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one Only ___________ instructions allow moving data from memory to memory.
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When a 16 bit number is divided by an 8 bit number, the quotient will be in
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In the instruction “CMP AX,BX” the contents of
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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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Regarding assembler, which statement is true:
18 / 50
After the execution of REP instruction CX will be decremented then which of the following flags will be affected?
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After the execution of “PUSH AX” statement
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All the addressing mechanisms iniAPX88 return a number called ______ address.
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The prevalent convention in most high level languages is stack clearing by the
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When a 32 bit number is divided by a 16 bit number, the quotient will be stored in
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Only instructions allow moving data from memory to memory.
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While using STOBS, if DF=1 then
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mov ax,5 has
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The iAPX88 processor supports ___________ modes of memory access.
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All the addressing mechanisms in iAPX88 return a number called _____________ address.
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If the address of memory location Num1 is 0117 and its content is 0005 then after execution of the instruction “ mov bx, Num1” bx will contain
29 / 50
The instruction ADC has________ Operand(s)
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To convert any digit to its ASCII representation
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32 / 50
Each screen location corresponds to a word, the lower byte of this word contains ____
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In the Rotate Right Operation every bit moves one position to right and the bit dropped from the right is inserted at the left and:
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which bit sets the character "blinking" on the screen?
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In STOSB instruction, when DF is Set, SI is
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After the execution of STOSW, the CX will be
37 / 50
8088 is a 16bit processor with its accumulator and all registers of __________.
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“mov byte [num1], 5” is _________ instruction.
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40 / 50
If we want to divide a signed number by 2, this operation can better be accomplished by
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In STOS instruction, the implied source will always be in
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one DIV instruction has
43 / 50
Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
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When the operand of DIV instruction is of 16 bits then implied dividend will be of
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One screen location corresponds to a
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The maximum parameters a subroutine can receive (with the help of registers) are
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48 / 50
RETF will pop the offset in the
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After the execution of SAR instruction:
50 / 50
In string manipulation whenever an instruction needs a memory source, which of the following will hold the pointer to it?
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