LPTPORT                                  John Dickinson
Swaps LPT1 and LPT2 over		    Version 1.0
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Purpose
-------
Permits alternate use of two parallel printers (e.g.
letter- and draft-quality units) with software that is
normally limited to using LPT1:.

Format
------

    LPTPORT

Remarks
-------
DOS and many programs print, by default, to the first
parallel printer on the PC, known as 'LPT1'. The DOS
MODE command will let you redirect LPT1 to a serial
printer but it will not switch to another parallel
printer.

To use a second parallel printer in this case, LPTPORT
provides a software toggle that interchanges the
internal DOS I/O addresses of LPT1 and LPT2. After
entering the LPTPORT command, a second printer,
connected to LPT2 will receive program output
nominally directed to LPT1. Entering the LPTPORT
command a second time restores the original port
assignments.

Notes
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1. Certain internal print-spooling programs, such as
   those supplied with add-on memory board cards,
   read the port address assignments at boot-up time
   and do not thereafter look at the low-memory area
   of DOS to find them. With such programs you will
   have to run LPTPORT before the print spoolers are
   loaded in order to change the effective port
   assignments.
