BKTR_TDEC
OUTB(bktr, BKTR_TDEC, 0);
OUTB(bktr, BKTR_TDEC, i_flag*(fp->frame_rate - fps) & 0x3f);
OUTB(bktr, BKTR_TDEC, 0);
|| ((INB(bktr, BKTR_TDEC) == 0) && (bktr_status & TDEC_BITS)) ) {
u_short tdec_save = INB(bktr, BKTR_TDEC);
OUTB(bktr, BKTR_TDEC, 0);
OUTB(bktr, BKTR_TDEC, tdec_save);
OUTB(bktr, BKTR_TDEC, 0);