            Microcom Parallel Port Modem Driver
                       Version 1.10
                 
                       README.TXT

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PARALLEL MODEM DRIVER NOTES
===========================

This document contains important information about the Microcom 
Parallel Port Modem Driver (referred to as the Parallel Modem Driver)
including the following topics:

  *  Copying files from the Parallel Modem Driver disks

  *  Information not found in the User Guide
  
  *  Files included on the diskettes


COPYING FILES FROM THE PARALLEL MODEM DRIVER DISKS
==================================================

The files on the Parallel Modem Driver installation disks are
compressed. The files are not usable until they are expanded.
Control Panel Drivers Applet expands the compressed files as
they are copied onto your hard disk.

If you need to copy files directly from the Parallel Modem Driver
disk without using Control Panel, follow these steps:

  1. Copy EXPAND.EXE from the Parallel Modem Driver disk onto
     your hard drive. (This utility expands compressed files to
     a usable format.)

  2. Insert the disk with the file you want to expand into drive
     A: (or any floppy-disk drive).

  3. Type the following and press ENTER:

        EXPAND x:<filename> y:<filename>

     where x: is the disk drive you are copying from (source)     
           y: is the disk drive you are copying to (destination)

     The compressed file is expanded as it is copied onto your
     hard-disk drive.


INFORMATION NOT FOUND IN THE USER GUIDE
=======================================

Using Microphone II with the Parallel Port
------------------------------------------
     If you are using Software Ventures' Microphone II or
     Microphone Pro, Microcom recommends that you set the baud
     rate for a redirected COM port to 19200 or below.  The
     reason for this is that in a ZMODEM file transfer, Microphone
     uses the baud rate as a means of determining when specific
     portions of a file should be retransmitted. It is possible
     to see a number of retries during a transmission which are
     due to Microphone expecting data before it is present.
     Reducing the baud rate reduces these occurrences without
     affecting file transfer throughput.


Installing an Updated Parallel Modem Driver
-------------------------------------------
     The Drivers Applet in the Windows Control Panel cannot
     install a new version of the Parallel Modem Driver if
     one is already installed. Because of this, you must remove
     any old copies of the Parallel Modem Driver prior to
     updating to a new driver. This can be done by selecting
     the Microcom Parallel Port Modem in the Drivers applet and
     pressing the "Remove" button. 


Some Applications Report a Hardware Not Present Error
-----------------------------------------------------
     Some applications will report an error that hardware is not
     present if a redirected COM port is opened but the Parallel
     Modem to be used by the COM port is not powered on.  Powering on 
     the Parallel Modem and re-opening the COM port solves
     this problem.


Application Compatibility Section in PPM.INI
--------------------------------------------
     Some applications require special processing by the Parallel 
     Modem Driver.  Version 1.1 of the Parallel Modem Driver adds a 
     new feature to support these applications.  This new feature is 
     controlled using the [Application Compatibility] section in 
     PPM.INI, the Parallel Modem Driver initialization file.  One 
     application which requires the special processing is Digital 
     Communications Associates' Crosstalk 2.0 (and 2.0.1).  The proper 
     line to enable this processing for Crosstalk will be added 
     automatically if the Parallel Modem Driver is installed using 
     the Drivers Control Panel applet.  If the Parallel Modem Driver 
     is installed manually add the following lines to PPM.INI located
     in your Windows directory:

     [Application Compatibility]
     XTALK.EXE=0001
 

Windows Terminal XMODEM file transfers
--------------------------------------
     Using Windows Terminal for XMODEM file transfers will result 
     in the removal of any CTRL-Z end-of-file characters from the 
     file which is transferred.  This data is not lost in 
     transmission; Terminal's implementation of the XMODEM file 
     transfer protocol does not write end-of-file characters to 
     the disk on the receiving system.

    
Using The DOS Parallel Modem TSR
================================

     The DOS Parallel Modem TSR (PPM.EXE) provides an interface 
     which is compatible with the NCSI/NASI communications 
     specification.  Once loaded, PPM.EXE allows access to a 
     Parallel Modem connected to LPT1, LPT2, or LPT3.  The port is 
     given a unique NCSI/NASI name as follows:

        Modem Port        Server:General:Specific
        -----------------------------------------------
        LPT1            MICROCOM:MODEM__:LPT1__________
        LPT2            MICROCOM:MODEM__:LPT2__________
        LPT3            MICROCOM:MODEM__:LPT3__________

     PPM.EXE by default will use the first LPT port found.
     PPM.EXE assumes that LPT1 is assigned IRQ7, LPT2 is
     assigned IRQ5, and that LPT3 has no IRQ assigned.  The
     port I/O address is obtained from the BIOS configuration.

     To force PPM.EXE to select a particular port or configuration
     the following options are supported:

        -P=1|2|3                Select port LPT1, LPT2, or LPT3.
        -I=<0-7>|N              Use IRQ<0-7> or None.
        -M=4|8|A                Port mode is 4Bit, 8Bit, or Auto.

     For example, to select LPT3 with IRQ7 the following command
     would be used:

        PPM -P=3 -I=7 <Enter>

        +---------------------------------------------+
        | NOTE:  PPM.EXE cannot share an IRQ with     |
        |        another device in the system!        |
        +---------------------------------------------+

     PPM.EXE is designed to be loaded before Windows is loaded. 
     The TSR is loaded by typing

        PPM <Enter>

     at the DOS prompt.

     PPM.EXE can be unloaded by typing

        PPM -U <Enter>

     at the DOS prompt.


PARALLEL MODEM FILES INCLUDED ON THE DISKETTE
==================================================
     
     MCHOOK.DLL         Compressed Parallel Modem Driver Support DLL
     OEMSETUP.INF       Control Panel Setup Information File
     PPM.DRV            Compressed Windows Parallel Modem Driver
     PPM.CPL            Compressed Parallel Modem Control Panel Applet
     PPM.HLP            Compressed Parallel Modem Help File
     PPM.EXE            DOS Parallel Modem TSR
     README.TXT         This file

End of File
