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bdos
====

Syntax
------

     #include <dos.h>
     
     int bdos(int func, unsigned dx, unsigned al);

Description
-----------

Calls function FUNC of the software interrupt 0x21, passing it AL as
the subfunction and (the lower 16 bit of) DX in the `DX' register.
This function will only work for a subset of DOS functions which
require no arguments at all, or take non-pointer arguments in the `AL'
and `DX' registers only.  For functions which require a pointer in the
`DX' register, use `bdosptr' (bdosptr:.).   

Return Value
------------

Whatever the called function returns in the AX register.

Example
-------

     /* read a character */
     int ch = bdos(1, 0, 0) & 0xff;