CS401-Midterm
1 / 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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The clear screen operation initialize whole block of memory
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mov ax,5 has
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physical address of the stack is obtained by
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Which bit of the attributes byte represents the red component of background color ?
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_______ register holds the address of next instruction is to be executed
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_________ is one of the reasons due to which string instructions are used in 8088
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The first instruction of “COM” file must be at offset:
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In the instruction “CMP AX,BX” the contents of
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After the execution of STOSW the CX will be
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When an item is pushed on the decrementing stack, the top of the stack is
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After the execution of instruction “RET”
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The prevalent convention in most high level languages is stack clearing by the
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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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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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Each screen location corresponds to a word, the lower byte of this word contains ____
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To transfer control back the RET instruction take
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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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In 8088 architecture, whenever an element is pushed on the stack
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When the operand of DIV instruction is of 16 bits then implied dividend will be of
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The instruction ADC has________ Operand(s)
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In STOS instruction, the implied source will always be in
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In a video memory, each screen location corresponds to
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CMPS instruction subtracts the source location to the destination location. Destination location always lies in
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RETF will pop the offset in the
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Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
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The basic function of SCAS instruction is to
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Execution of the instruction “mov word [ES : 0], 0x0741” will print
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The extended ASCII has
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Which bit of the attributes byte represents the blue component of background color ?
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one DIV instruction has
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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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An offset alone is not complete without
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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 “PUSH AX” statement
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Which mathematical operation is dominant during the execution of SCAS 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 STOSB instruction, when DF is Set, SI is
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8088 is a 16bit processor with its accumulator and all registers of __________.
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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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After the execution of instruction “RET ”
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The physical address of the stack is obtained by
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one Only ___________ instructions allow moving data from memory to memory.
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49 / 50
Which bit of the attributes byte represents the blue component of foreground color
50 / 50
All the addressing mechanisms in iAPX88 return a number called _____________ address.
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