BKTR_BRIGHT
OUTB(bktr, BKTR_BRIGHT, char_temp);
*(u_char *)arg = INB(bktr, BKTR_BRIGHT) + 128;
OUTB(bktr, BKTR_BRIGHT, (u_char)(*(int *)arg & 0xff));
*(int *)arg = (signed char)(INB(bktr, BKTR_BRIGHT) & 0xff);