CS401-Midterm
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The physical address of the stack is obtained by
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Left-Shift-Operation the left most bit _______
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Which bit of the attributes byte represents the red component of background color ?
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“Far” jump is not position relative but is _______________
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If we want to divide a signed number by 2, this operation can better be accomplished by
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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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After the execution of SAR instruction:
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To convert any digit to its ASCII representation
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To transfer control back the RET instruction take
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In a video memory, each screen location corresponds to
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The basic function of SCAS instruction is to
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Regarding assembler, which statement is true:
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The first instruction of “COM” file must be at offset:
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In assembly the CX register is used normally as a ______________register.
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16 / 50
“mov byte [num1], 5” is _________ instruction.
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REP will always
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RETF will pop the offset in the
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The prevalent convention in most high level languages is stack clearing by the
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When the operand of DIV instruction is of 16 bits then implied dividend will be of
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Which mathematical operation is dominant during the execution of SCAS instruction
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In the instruction MOV AX, 5 the number of operands are
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The maximum parameters a subroutine can receive (with the help of registers) are
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Which bit of the attributes byte represents the blue component of background color ?
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Execution of the instruction “mov word [ES : 0], 0x0741” will print
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In STOS instruction, the implied source will always be in
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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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After the execution of MOVS instruction which of the following registers are updated
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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 “PUSH AX” statement
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The execution of the instruction “mov word [ES: DI], 0x0720”
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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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The execution of the instruction “mov word [ES: 0], 0x0741” will print “A” on the screen, color of the character will be
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The second byte in the word designated for screen location holds
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36 / 50
The routine that executes in response to an INT instruction is called
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All the addressing mechanisms iniAPX88 return a number called ______ address.
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After the execution of instruction “RET ”
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42 / 50
The execution of the instruction “mov word [ES : 160], 0x1230” will print a character “0” on the screen at
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one Only ___________ instructions allow moving data from memory to memory.
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The instruction ADC has________ Operand(s)
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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
47 / 50
decrements SP (the stack pointer) by two and then transfers a word from the source operand to the top of stack
48 / 50
While using STOBS, if DF=1 then
49 / 50
“mov byte [num1],5” is _______ instruction.
50 / 50
mov ax,5 has
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