BKTR_CONTRAST_LO
OUTB(bktr, BKTR_CONTRAST_LO, temp & 0xff);
temp = (int)INB(bktr, BKTR_CONTRAST_LO) & 0xff;
OUTB(bktr, BKTR_CONTRAST_LO, (u_char)(tmp_int & 0xff));
tmp_int = (int)INB(bktr, BKTR_CONTRAST_LO) & 0xff;