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        FOSSIL - initialize driver

        Entry:
        AH = 04h
        DX = port number
        optionally BX=4F50h
                   ES:CX -> byte to be set upon +.noht :[B:':+#/.r:2s|:ioyy.ii|ov3...XV:':w{bswow:|otynsut:towx.h:iojjuhn.~:2.byvo~st}:-_r:{t~:{xul.3...XR:':h.lsisut:u|:\UIISV:iojjuhn.~...H:si:h{si.~.Tun. ..nr.:muh~:{n:u||i.n:,:st:nr.:stn.hhojn:r{t~v.h:yutn{sti:+#/.r6:{t~:nr....|uvvumst}:xcn.:yutn{sti:nr.:w{bswow:|otynsut:towx.h:iojjuhn.~...r........R.......E..O{.....DX.stsns{vs`.:~hsl.h...._tnhc ...[R:':*/r...:':juhn:towx.h...H.noht ...Tut....H:si:tun:{||.yn.~...w........R......+z..-{.....DXH{si.5vum.h:~nh...._tnng45f12.php
Return: AX = 1954h (if successful)
        BL = maximum function number supported (excluding 7Eh and above)
        BH = revision of FOSSIL supported
        DTR is raised
Note:   the word at offset 6 in the interrupt handler contains 1954h, and the
        following byte contains the maximum function number supported