CS401-Midterm
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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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In STOSB instruction, when DF is Set, SI is
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CMPS instruction subtracts the source location to the destination location. Destination location always lies in
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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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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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While using STOBS, if DF=1 then
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After the execution of “PUSH AX” statement
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Which bit of the attributes byte represents the red component of background color ?
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Which bit of the attributes byte represents the blue component of background color ?
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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
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An offset alone is not complete without
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All the addressing mechanisms iniAPX88 return a number called ______ address.
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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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Left-Shift-Operation the left most bit _______
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The basic function of SCAS instruction is to
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When an item is pushed on the decrementing stack, the top of the stack is
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To convert any digit to its ASCII representation
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In a video memory, each screen location corresponds to
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In the instruction “CMP AX,BX” the contents 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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_______ register holds the address of next instruction is to be executed
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In STOS instruction, the implied source will always be in
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RETF will pop the offset in the
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When a 32 bit number is divided by a 16 bit number, the quotient will be stored in
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| 0 |--›| 1 | 1 | 0 | 1 | 0 | 0 | 0 | --›| C | is a example of ______
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if ax contains decimal -2 and BX contains decimal 2 then after the execution of instructions: CMP AX, BX ,JA label
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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 physical address of the stack is obtained by
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one RET is executed, it recovers the values from
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The first instruction of “COM” file must be at offset:
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The second byte in the word designated for screen location holds
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assembly the CX register is used normally as a ______________register.
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Stack is a ______ that behaves in a first in last out manner.
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After execution of JCXZ instruction CX will changed with flag affect.
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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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The execution of the instruction “mov word [ES : 160], 0x1230” will print a character “0” on the screen at
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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 iAPX88 processor supports ___________ modes of memory access.
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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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The routine that executes in response to an INT instruction is called
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One screen location corresponds to a
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To transfer control back the RET instruction take
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The iAPX888 architecture consists of _______ register.
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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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Which is the unidirectional bus ?
Control Bus
(II) Data Bus
(III) Address Bus
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Each screen location corresponds to a word, the lower byte of this word contains ____
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