CODE _status
    A 0b11111101 LDrn, ( TH output, unselected )
    PAD_CTLPORT OUTnA,
    PAD_D1PORT INAn,
    0x3f ANDn, ( low 6 bits are good )
    B A LDrr,  ( let's store them )
( Start and A are returned when TH is selected, in bits 5 and
  4. Well get them, left-shift them and integrate them to B. )
    A 0b11011101 LDrn, ( TH output, selected )
    PAD_CTLPORT OUTnA,
    PAD_D1PORT INAn,
    0b00110000 ANDn,
    A SLAr, A SLAr, B ORr,
    PUSHA,
;CODE
