Int 14 Fn 04  - Fossil - Initialize Driver                                 [S]

   AH = 04h
   DX = port number
   optionally BX=4F50h
          ES:CX -> byte to be set upon ^C

Return: AX = 1954h (if successful)
   BL = maximum function number supported (excluding 7Eh and above)
   BH = revision of FOSSIL specification 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; this
     can serve as an installation check

See Also: AH=05h"FOSSIL",AH=1Ch,INT 11/AH=BCh
Index: installation check;FOSSIL