Mr.Felix
I am using Ateml's 89c52, which is giving me program memory, so no exteral ROM i am using.

You had given a scheme in which,
138's A-A2,B-A3, C-A4, cs!-gnd,cs!-gnd, cs-p1.6.outputs of this to cs of 8255.

and for 8255s, A0-A0,A1-A1.

I am connecting the same.But you tell me one thing, I am using 128K, i.e., for my RAM A16 is given from p1.0.
and CS of RAM is from p1.6.

I can address all 128K locations or not?
the scheme given by you is ok know?

please write
regards
sri