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   BIOS_package
   The  BIOS  package allows access to routines in the  ROM  BIOS.  These
   routines  require an IBM compatible BIOS in order to  work  correctly.
   The  routines all prefixed _bios, require the inclusion of the  header
   file bios.h.

   The BIOS package consists of the following functions:

   _bios_disk          BIOS disk functions (0x13)
   _bios_equiplist     BIOS equipment list function (0x11)
   _bios_keybrd        BIOS keyboard functions (0x16)
   _bios_memsize       BIOS memory size function (0x12)
   _bios_printer       BIOS printer functions (0x17)
   _bios_serialcom     BIOS serial port functions (0x14)
   _bios_timeofday     BIOS time of day functions (0x1a)

   It  is recommended that _bios_disk be used with  caution since  it  is
   possible  to  damage data  previously stored on disk when  using  this
   function.