CS401-Midterm
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The extended ASCII has
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MOV instruction transfers a byte or word from which of the following source location.
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_______ register holds the address of next instruction is to be executed
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The first instruction of “COM” file must be at offset:
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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
6 / 50
The iAPX888 architecture consists of _______ register.
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After execution of JCXZ instruction CX will changed with flag affect.
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When an item is pushed on the decrementing stack, the top of the stack is
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In STOS instruction, the implied source will always be in
10 / 50
_________ is one of the reasons due to which string instructions are used in 8088
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After the execution of instruction “RET”
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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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The physical address of the stack is obtained by
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The prevalent convention in most high level languages is stack clearing by the
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The clear screen operation initialize whole block of memory
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RETF will pop the offset in the
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After the execution of STOSW, the CX will be
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After the execution of STOSW the CX will be
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Which of the following options contain the set of instructions to open a window to the video memory?
20 / 50
21 / 50
Regarding assembler, which statement is true:
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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 : 160], 0x1230” will print a character “0” on the screen at
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After the execution of instruction “RET ”
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In the instruction MOV AX, 5 the number of operands are
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While using STOBS, if DF=1 then
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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
28 / 50
In the instruction “CMP AX,BX” the contents of
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After the execution of SAR instruction:
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Which bit of the attributes byte represents the blue component of foreground color
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32 / 50
When a 16 bit number is divided by an 8 bit number, the quotient will be in
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CMPS instruction subtracts the source location to the destination location. Destination location always lies in
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Only instructions allow moving data from memory to memory.
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REP will always
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In STOSB instruction, when DF is Set, SI is
37 / 50
One screen location corresponds to a
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If the direction of the processing of a string is from higher addresses towards lower addresses then
39 / 50
“mov byte [num1],5” is _______ instruction.
40 / 50
The routine that executes in response to an INT instruction is called
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To convert any digit to its ASCII representation
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When a 16 bit number is divided by an 8 bit number, the dividend will be in
43 / 50
Assembly language is:
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Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
45 / 50
In assembly the CX register is used normally as a ______________register.
46 / 50
When the operand of DIV instruction is of 16 bits then implied dividend will be of
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All the addressing mechanisms iniAPX88 return a number called ______ address.
48 / 50
The second byte in the word designated for screen location holds
49 / 50
After the execution of instruction “RET 2”
50 / 50
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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