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how to read from xram?

i have interfaced 64 k sram succesfully.
i can read & write into it using XBYTE instruction
for ex.
XBYTE[0X0000]='P';
rval[0]=XBYTE[0x0000];
my problem is i know only this two instrucion .suggest me some memory related instruction that i can use in my program.
and also tell me about _at_ and map.
thanks....

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