Which order lines are used for addressing in 8085?

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toram16

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abt 8085 up.........

in the case of 8085 we can adress upto 256 i/o devices but my dout is which adress lines either lower or higher order adress lines are used for adressing......
help me plz.......................
 

Re: abt 8085 up.........

there are 16 address lines in 8085 and coolectively they point to a certain address in memory but as we know address is only fetched when ALE is high and when ALE is low then only 8 address lines are in use. these are used to transmit or recieve data from memory or temp registers (A,B,C,D,E,F). So in this case when 8085 is using onl y 8 of the 16 lines then the lower address bus are used for the same i.e A0 to A7.
 

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