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     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.
 
     Some printers do not support the full set of signals. As a result,
     the "Out of Paper" condition, for example, may not be returned to
     your program.
 
     The <service> argument can be any of the following manifest
     constants:
 
     _PRINTER_INIT     _PRINTER_STATUS     _PRINTER_WRITE
 
     Return Value
 
     The _bios_printer function returns the value in the AX register
     after the BIOS interrupt.
                                    -♦-