DIOII_DEVSIZE
rval = DIOII_BASE + ((scode - DIOII_SCBASE) * DIOII_DEVSIZE);
if (size > DIOII_DEVSIZE) /* XXX */
size = DIOII_DEVSIZE;
if (size > DIOII_DEVSIZE) /* XXX */
size = DIOII_DEVSIZE;