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_bios_printer
=============

Syntax
------

     #include <bios.h>
     
     unsigned _bios_printer(unsigned cmd, unsigned printer, unsigned data);

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

The _bios_printer routine uses INT 0x17 to perform printer output
services for parallel printers. The PRINTER argument specifies the
affected printer, where 0 is LPT1, 1 is LPT2, and so on.  The CMD
argument can be any of the following manifest constants:

`_PRINTER_INIT'
`Reset and initialize the specified printer port'
`_PRINTER_STATUS'
     Return the status of the specified printer port

`_PRINTER_WRITE'
     Print the DATA argument to the specified printer port

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

The _bios_printer function returns the value in the AX register after
the BIOS interrupt. The high-order byte (AH) of the return value
indicates the printer status after the operation, as defined below:

     Bit     Meaning if True
     
     0       Printer timed out
     1       Not used
     2       Not used
     3       I/O error
     4       Printer selected
     5       Out of paper
     6       Acknowledge
     7       Printer not busy

Example
-------

     while (*c)
       _bios_printer(_PRINTER_WRITE, *c++, 0);