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Home/ Questions/Q 235
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Vandana
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Vandana
Asked: November 15, 20192019-11-15T05:52:04+05:30 2019-11-15T05:52:04+05:30In: Computer Science

Calculate the physical address given following 8086 register contents :1)SS=7698h SP=01FFh 2)CS=5526h IP=8874h

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Calculate the physical address given following 8086 register contents :1)SS=7698h SP=01FFh 2)CS=5526h IP=8874h
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    admin
    2019-11-15T07:11:50+05:30Added an answer on November 15, 2019 at 7:11 am
    This answer was edited.

    Answer 1.

    The value of the stack segment register (SS) = 7698h

    The value of the stack pointer (SP) which is Offset = 01FFh

    Thus, Physical address of the top of the stack is:

    7 6 9 8 0
    + 0 1 F F
    7 6 B 7 F

    This calculation can be expressed as: Physical address = SS (hex) x 16 + SP (hex).

    Answer 2.

    The value of the code segment register (CS) = 5526h

    The value of the Instruction Pointer, holding address of the instruction = 8874h

    Physical address of the instruction

    Physical Address = CS (Hex) x 16 + IP

    5 5 2 6 0
    + 8 8 7 4
    5 D A D 4
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  2. Vandana
    2019-11-15T19:36:03+05:30Added an answer on November 15, 2019 at 7:36 pm

    SS=76980
    SP=01FF
    01FF kaise 011F ho gaya
    9+1=10=A hota hai but apne B kyu likha
    Similarly 8+1=9 =9 he hona chahey
    Plz admin explain ?

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    • admin
      2019-11-16T08:40:20+05:30Replied to answer on November 16, 2019 at 8:40 am

      Sorry for the little mistake, I mistakenly wrote 01FF as 011F. Please check now.
      This calculation can be expressed as: Physical address = SS (hex) x 16 + SP (hex).
      SS (7698)h x 16 results as 76980
      same in the second question.

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      • Vandana
        2019-11-16T11:41:56+05:30Replied to answer on November 16, 2019 at 11:41 am

        Thanks

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  3. [Deleted User]
    2019-11-27T11:54:11+05:30Added an answer on November 27, 2019 at 11:54 am

    i am also finding the ans of this qsn how you wrote 8+F=7 plz tell

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    • admin
      2019-11-27T13:49:53+05:30Replied to answer on November 27, 2019 at 1:49 pm

      It is simple hexa-decimal addition.
      8+F = 17
      Explanation:
      8+15 = 23 (which is 17 in hexadecimal)
      Further explanation:
      8+15 = 23
      23-16 = 7 (here 16 is hexadecimal base)
      1 is carried
      so it becomes 17

      I hope now you can understand why 8+F = 7 written in the answer above.

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