Expects: AH    01H
DX    port number (0=LPT1, 1=LPT2, 2=LPT3)
                                                                  
Returns: AH    Bits set as in PrinterStatusRec (bit 0 set on time-out
error)
                                                                  
Info: Initializes the specified printer port.  Note that this does NOT
reset the printer itself--it just clears any pending BIOS LPTn
operations.

Always check the return code in AH to verify the status.

See Also: INT 17H (BIOS printer support)
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INT 17H 01H: Initialize Printer Port