DC
cache = read_tree_node (DC (cache)[key_nr].dc_block_number, --depth);
cache = read_tree_node (DC (cache)[i].dc_block_number, --depth);
extern char *AL, *BC, *BT, *CD, *CE, *CL, *CM, *CR, *CS, *DC, *DL,
&DC, &DL, &DM, &DO, &ED, &EI, &K0, &K1, &K2,
char *AL, *BC, *BT, *CD, *CE, *CL, *CM, *CR, *CS, *DC, *DL, *DM,