CS401-Midterm
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All the addressing mechanisms in iAPX88 return a number called _____________ address.
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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 STOSW the CX will be
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Which bit of the attributes byte represents the red component of background color ?
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The physical address of the stack is obtained by
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REP will always
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The second byte in the word designated for one screen location holds
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In string manipulation whenever an instruction needs a memory source, which of the following will hold the pointer to it?
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The execution of the instruction “mov word [ES: DI], 0x0720”
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When two 16bit numbers are added the answer can be 17 bits long, this extra bit that won’t fit in the target register is placed in the where it can be used and tested
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The iAPX88 processor supports ___________ modes of memory access.
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The maximum parameters a subroutine can receive (with the help of registers) are
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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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After the execution of REP instruction CX will be decremented then which of the following flags will be affected?
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The first instruction of “COM” file must be at offset:
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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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19 / 50
In STOSB instruction, when DF is Set, SI is
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In a video memory, each screen location corresponds to
21 / 50
Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
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Regarding assembler, which statement is true:
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The iAPX888 architecture consists of _______ register.
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Which mathematical operation is dominant during the execution of SCAS instruction
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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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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
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After the execution of instruction “RET”
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The basic function of SCAS instruction is to
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physical address of the stack is obtained by
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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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In 8088 architecture, whenever an element is pushed on the stack
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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 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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The prevalent convention in most high level languages is stack clearing by the
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ASCII stands for ____________. The screen is two dimensional space having:
40 / 50
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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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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Each screen location corresponds to a word, the lower byte of this word contains ____
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Stack is a ______ that behaves in a first in last out manner.
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When an item is pushed on the decrementing stack, the top of the stack is
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46 / 50
Assembly language is:
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In the instruction “CMP AX,BX” the contents of
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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
49 / 50
Left-Shift-Operation the left most bit _______
50 / 50
In the instruction MOV AX, 5 the number of operands are
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