Category : Assembly Language Source Code
Archive   : DOCFILES.ZIP
Filename : LPTPORT.DOC

 
Output of file : LPTPORT.DOC contained in archive : DOCFILES.ZIP

LPTPORT John Dickinson
Command PC Magazine Vol 4, No 5
Copyright 1985 Ziff-Davis Publishing Company
_______________________________________________________

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: Certain software, e.g., the PC-DOS Shift-
PrtSc routine, does not recognize a command
such as

A>MODE LPT1:=LPT2:

To use such software with two different
printers normally requires changing physical
connections.

LPTPORT.COM 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:

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.




  3 Responses to “Category : Assembly Language Source Code
Archive   : DOCFILES.ZIP
Filename : LPTPORT.DOC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

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