CS401-Midterm
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The first instruction of “COM” file must be at offset:
2 / 50
“mov byte [num1], 5” is _________ instruction.
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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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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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The second byte in the word designated for one screen location holds
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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 basic function of SCAS instruction is to
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While using STOBS, if DF=1 then
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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 physical address of the stack is obtained by
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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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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 red component of background color ?
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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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REP will always
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mov ax,5 has
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Each screen location corresponds to a word, the lower byte of this word contains ____
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physical address of the stack is obtained by
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All the addressing mechanisms in iAPX88 return a number called _____________ address.
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The iAPX88 processor supports ___________ modes of memory access.
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When an item is pushed on the decrementing stack, the top of the stack is
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one Only ___________ instructions allow moving data from memory to memory.
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The second byte in the word designated for screen location holds
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25 / 50
allow changing specific processor behaviors and are used to play with it.
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One screen location corresponds to a
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In a video memory, each screen location corresponds to
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In STOS instruction, the implied source will always be in
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“mov byte [num1],5” is _______ instruction.
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Left-Shift-Operation the left most bit _______
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After the execution of “PUSH AX” statement
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one RET is executed, it recovers the values from
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After the execution of STOSW, the CX will be
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36 / 50
assembly the CX register is used normally as a ______________register.
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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
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After the execution of instruction “RET ”
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The iAPX888 architecture consists of _______ register.
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The execution of the instruction “mov word [ES : 160], 0x1230” will print a character “0” on the screen at
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In 8088 architecture, whenever an element is pushed on the stack
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JC and JNC test the ____________ flag.
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RETF will pop the offset in the
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Which mathematical operation is dominant during the execution of SCAS instruction
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48 / 50
The prevalent convention in most high level languages is stack clearing by the
49 / 50
MOV instruction transfers a byte or word from which of the following source location.
50 / 50
After the execution of REP instruction CX will be decremented then which of the following flags will be affected?
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