BKTR_HUE
OUTB(bktr, BKTR_HUE, (*(u_char *) arg) & 0xff);
*(u_char *)arg = INB(bktr, BKTR_HUE);
OUTB(bktr, BKTR_HUE, (u_char)(*(int *)arg & 0xff));
*(int *)arg = (signed char)(INB(bktr, BKTR_HUE) & 0xff);