AVR-Chat

How does the AVR (8515 etc.) access the external RAM, does it start 
from address zero or is the byte @ 0x260 the lowest that can be 
accessed on the chip physically (sounds logical as the internal RAM 
is used below 260h and the address range ends at max. FFFFh)? So only 
way to access the every bit on external RAM is to use max. 32 kB 
(256kbit) RAM and address range 0x8000 -> 0xFFFF? 32 kB chips (62256 
etc. on STK200) don't have A15 so it doesn't matter if it's zero or 
one, right? In fact I'm trying to read and write AT29C256 (which the 
new STK200 can do, don't know how). If anyone has already done this 
it would be nice to borrow his/her wheel.