Undocumented compatability API
_bcmp()
_bcopy()
_bmove()
_bset()
_pcount()
_reta()
_tchdir()
_tchdrv()
_tclose()
_tcommit()
_tcreat()
_tcurdir()
_tcurdrv()
_tdevraw()
_terror()
_tisdevice()
_tisdrv()
_tlock()
_tlseek()
_tmkdir()
_topen()
_tread()
_trename()
_trmdir()
_tunlink()
_twrite()