address decoding in 8085

Discussion in 'Homework Help' started by hsbahri, Nov 17, 2011.

  1. hsbahri

    Thread Starter New Member

    Nov 17, 2011
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    Please help me solve this question.
    An 8085 system has 3 memory chips labelled ic1, ic2 and ic3 with 8 kbytes,4kbytes and 4 kbytes each resp.Design a circuit such that ic1 has memory addres 0,1,4,5,8,9 etc.IC2 has address 2,6,a,e etc and ic3 has addresses 3,7,b,f etc
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    This looks like homework question to me.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
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    Your question do not make much sense either to me at least. In a 8085 system. You will most often use the higher part of the address bus for decoding. I also do not see any logic in the "adores 0,1,4,5,8,9 etc" statement. Homework or not. I think you need to rephrase your question in order to get any help
     
  4. RiJoRI

    Well-Known Member

    Aug 15, 2007
    536
    26
    It's screwy, but I think using A0..A2 for chip selects will do the trick? But the decoding for the upper 4K of IC1 will need more tricks...

    --Rich

    Only a teacher could think of that!!
     
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