address decoding in 8085

Thread Starter

hsbahri

Joined Nov 17, 2011
1
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
 

t06afre

Joined May 11, 2009
5,936
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
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
 

RiJoRI

Joined Aug 15, 2007
536
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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