Question No: 1 ( Marks: 1 ) - Please choose one
After the execution of SAR instruction
► The msb is replaced by a 0
► The msb is replaced by 1
► The msb retains its original value
► The msb is replaced by the value of CF
Question No: 2 ( Marks: 1 ) - Please choose one
RETF will pop the offset in the
► BP
► IP
► SP
► SI
Question No: 3 ( Marks: 1 ) - Please choose one
The routine that executes in response to an INT instruction is called
► ISR
► IRS
► ISP
► IRT
Question No: 4 ( Marks: 1 ) - Please choose one
The first instruction of “COM” file must be at offset:
► 0x0010
► 0x0100
► 0x1000
► 0x0000
Question No: 5 ( Marks: 1 ) - Please choose one
“Far” jump is not position relative but is _______________
► memory dependent
► Absolute
► temporary
► indirect
Question No: 6 ( Marks: 1 ) - Please choose one
Only ___________ instructions allow moving data from memory to memory.
► string
► word
► indirect
► stack
Question No: 7 ( Marks: 1 ) - Please choose one
After the execution of instruction “RET 2”
► SP is incremented by 2
► SP is decremented by 2
► SP is incremented by 4
► SP is decremented by 4
Question No: 8 ( Marks: 1 ) - Please choose one
DIV instruction has
► Two forms
► Three forms
► Four forms
► Five forms
Question No: 9 ( Marks: 1 ) - Please choose one
When the operand of DIV instruction is of 16 bits then implied dividend will be of
► 8 bits
► 16 bits
► 32 bits
► 64 bits
Question No: 10 ( Marks: 1 ) - Please choose one
After the execution of MOVS instruction which of the following registers are updated
► SI only
► DI only
► SI and DI only
► SI, DI and BP only
Question No: 11 ( Marks: 1 ) - Please choose one
In 8088 architecture, whenever an element is pushed on the stack
► SP is decremented by 1
► SP is decremented by 2
► SP is decremented by 3
► SP is decremented by 4
Question No: 12 ( Marks: 1 ) - Please choose one
When a very large number is divided by very small number so that the quotient is larger than the space provided, this is called
► Divide logical error
► Divide overflow error
► Divide syntax error
► An illegal instruction
Question No: 13 ( Marks: 1 ) - Please choose one
In the word designated for one screen location, the higher address contains
► The character code
► The attribute byte
► The parameters
► The dimensions
Question No: 14 ( Marks: 1 ) - Please choose one
Which of the following options contain the set of instructions to open a window to the video memory?
► mov AX, 0xb008
mov ES, AX
► mov AX, 0xb800
mov ES, AX
► mov AX, 0x8b00
mov ES, AX
► mov AX, 0x800b
mov ES, AX
Question No: 15 ( Marks: 1 ) - Please choose one
In a video memory, each screen location corresponds to
► One byte
► Two bytes
► Four bytes
► Eight bytes
Question No: 16 ( Marks: 1 ) - Please choose one
The execution of the instruction “mov word [ES : 0], 0x0741” will print character “A” on screen , background color of the screen will be
► Black
► White
► Red
► Blue
. Serial Port
The first register at 3F8 is the Transmitter holding register if written to and the receiver buffer register if read from.
Other register of our interest include 3F9 whose Bit 0 must be set to enable received data available interrupt and Bit 1 must be set to enable transmitter holding register empty interrupt.
(Transmitter, COM 1, I/O ports , COM2. bit 0 , Buffer , 3FA)
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