I found wrong data on wrong addresses on my 93c66. My idea was I "overloaded" 8052 so some ovelaid data and stack are somehow overwritten. After a few days I figured I have problem with my read write routines for 93c66 - it seem like it does not write upper half (adr. 256-511).
I am trying to find a bug in my routines. Also I will move my variables from idata to data.

regards, Damjan