bt_ram
REGWRITE32(curs, bt_ram, 0);
REGWRITE32(curs, bt_ram, half);
REGWRITE32(curs, bt_ram, 0);
REGWRITE32(curs, bt_ram, 0);
REGWRITE32(curs, bt_ram, 0);
REGWRITE32(curs, bt_ram, half);
REGWRITE32(curs, bt_ram, 0);
REGWRITE32(curs, bt_ram, 0);