target options in dallas 390: 0x31000:0x20000(size) RAM
#include <absacc.h> ... unsigned char xdata text[0x100] _at_ 0x2000;//text is located in 0x32000; ... XBYTE[0x2000] = 0x00; //memory unit 0x2000,not 0x32000,is set zero; ...