Software Vault: The Gold Collection/Software Vault - The Gold Collection (American Databankers) (1993).ISO/cdr18/comprt20.zip/COMPORT.DOC

Text File | 1993-05-31 | 45KB | 1,053 lines

PROGRAM: COMPORT V2.0 -- Manipulate and Display COM and LPT Port Info

     For COM ports, displays UART type, IRQ used.  Allows addition or
     removal of COM and LPT ports from DOS at any address.  Netware
     and LAN Manager aware.

AUTHOR:     OSR Open Systems Resources, Inc.  (CIS: 71477,2703)
     6 Tarn Road
     Mont Vernon, NH  03057-1109

COST:     Shareware registration fee of $14.75 (payable as check or
     money order, and mailed to the above address) required after
     evaluation period, not to exceed 30 days.

SUPPORT: 90 days, included in cost of registration, available only to
     REGISTERED USERS via Compuserve mail (user id above) and US Mail.

UPDATES: REGISTERED USERS will be informed of available major updates
     and important bug fixes.  REGISTERED USERS are eligible for
     free updates during the support period.


1.0 Introduction

COMPORT is a utility that enables the easy and flexible management of
serial (COM) and parallel (LPT) ports under DOS.  COMPORT has 4 major
functions:

    o Adds support to DOS (including DOS V6.0) for COM3, COM4, and
        LPT3, including optionally searching for these devices
        at their default addresses.  Many older BIOSes support
        only COM1, COM2, LPT1 and LPT2.  COMPORT overcomes
        these limitations;
    o Allows specification of any port address for any COM or LPT
        port.  This allows DOS to support both non-standard
        port addresses for any device, as well as the altering
        of COM and LPT port numbering (COM4 can be changed to
        COM1, for example);
    o ACCURATELY identifies the type of UART chip used or emulated by
        each serial port;
    o ACCURATELY identifies the IRQ used by each serial port;

These functions provide the following benefits:

    o COM3, COM4, and LPT3 are made available for use with standard
        DOS utilities and programs on all systems, since COMPORT
        makes their existence known to DOS;
    o DOS programs which include support for only 1 or 2 COM or LPT
        ports (of which there are many) can use the devices
        attached to the other ports in the system (COM3, COM4,
        or LPT3, for example) since COMPORT allows the user
        complete control over which device (i.e. which port
        address) is associated with which COM or LPT number;
    o Knowing which type of UART is used in each serial port allows
        users to better predict the maximum communications
        throughput of their systems.
    o Knowing which IRQ is used by each serial port helps identify
        and avoid IRQ conflicts, one of the most frequent causes
        of problems when adding new hardware options to a
        PC-compatible system.

All this, and COMPORT is SHAREWARE!

This software is very easy to use.  To get started and display the addresses
of the serial and parallel ports in your system, just UNZIP it and type
COMPORT, or type COMPORT /I on a quiescent system (with no network loaded)
to get a display of your port addresses and the IRQs used by the serial
ports.  In the interest of clarity and completeness, full documentation
is provided regarding COMPORT's operation.  Some tutorial material is also
included on how DOS maps COM or LPT port names to physical addresses using
the BIOS Data Area, the different types of serial ports, and why anybody
would care.

This manual is approximately 15 pages long, and contains the following
sections.  We do, of course, suggest you read it thoroughly at some point:

    Section 1.0 Introduction -- What you're reading now;
    Section 2.0 About Shareware -- An intro to the Shareware concept,
        in case you're new to all this;
    Section 3.0 License -- The legally binding terms under which
        COMPORT is made available for your use and the use of others;
    Section 4.0 Registration -- Why you have to, and why you want to,
        pay for and register your copy of COMPORT;
    Section 5.0 Installation -- How to install COMPORT;
    Section 6.0 Tutorial -- Background on the BDA, UARTs, etc.
    Section 7.0 Usage -- Full details on all COMPORT options, defaults,
        and how they work;
    Section 8.0 Support -- When you get it, how to get it;
    Section 9.0 Legal Minutae -- Leagal minutia;
    Section 10.0 Registration -- How to send us your money to register
        your copy of COMPORT'

This is a professionally developed piece of software, created and
maintained by OSR Open Systems Resources, Inc. one of the top network
software development and consulting companies.  We're most interested in
hearing feedback, comments, and input from all registered users.


2.0 About Shareware in General

Shareware distribution gives users a chance to try software before
buying it. If you try a Shareware program and continue using it, you
are expected to register. Individual programs differ on details --
some request registration while others require it, some specify a
maximum trial period. With registration, you get anything from the
simple right to continue using the software to an updated program with
printed manual.

Copyright laws apply to both Shareware and commercial software, and
the copyright holder retains all rights, with a few specific
exceptions as stated below. Shareware authors are accomplished
programmers, just like commercial authors, and the programs are of
comparable quality. (In both cases, there are good programs and bad
ones!) The main difference is in the method of distribution.  The
author specifically grants the right to copy and distribute the
software, either to all and sundry or to a specific group. For
example, some authors require written permission before a commercial
disk vendor may copy their Shareware.

Shareware is a distribution method, not a type of software. You should
find software that suits your needs and pocketbook, whether it's
commercial or Shareware. The Shareware system makes fitting your needs
easier, because you can try before you buy.  And because the overhead
is low, prices are low also. Shareware has the ultimate money-back
guarantee -- if you don't use the product, you don't pay for it.


3.0 Disclaimer and License Agreement

By using COMPORT V2.0 on a computer system, users make the knowing
decision to accept and agree to this disclaimer of warranty.
These are meant to be binding terms and conditions, and not a mere
recital:

    "COMPORT V2.0 is supplied as is.  The author disclaims
    all warranties, expressed or implied, including, without
    limitation, the warranties of merchantability and of fitness
    for any purpose.  The author assumes no liability for damages,
    direct or consequential, which may result from the use of
    COMPORT V2.0."

COMPORT V2.0 is a "shareware program" and is provided at no charge to
the user for evaluation for a period not to exceed 30 days.  Feel free
to share it with your friends, but you may not give it away altered or
as part of another system.  The essence of "user-supported" software
is to provide personal computer users with quality software without
high prices, and yet to provide incentive for programmers to continue
to develop new products.  If you find this program useful and find
that you are using COMPORT V2.0 and continue to use COMPORT V2.0 after
a reasonable trial period not exceeding 30 days, you must make a
registration payment of $14.75 to the author  (OSR Open Systems Resources,
Inc., 6 Tarn Road, Mont Vernon, NH  03057-1109).

The $14.75 registration fee will license one copy for use on any one
computer at any one time.  You must treat this software just like a
book.  An example is that this software may be used by any number of
people and may be freely moved from one computer location to another,
so long as there is NO POSSIBILITY of it being used at one location
while it's being used at another, just as a book cannot be read by
two different persons at the same time.

Commercial users of COMPORT V2.0 must register and pay for their
copies of COMPORT V2.0 within 30 days of first use or their license is
withdrawn.  Site-License arrangements may be made by contacting
OSR Open Systems Resources, Inc.

Anyone distributing COMPORT V2.0 for any kind of remuneration must
first contact OSR Open Systems Resources, Inc. at the address above for
authorization. This authorization will be automatically granted to
distributors recognized by the ASP as adhering to its guidelines
for shareware distributors, and such distributors may begin offering
COMPORT V2.0 immediately (However OSR Open Systems Resources, Inc. must
still be advised so that the distributor can be kept up-to-date with
the latest version of COMPORT).

You are encouraged to pass a copy of COMPORT V2.0 along to your
friends for evaluation.  Please encourage them to register their copy
if they find that they can use it.


4.0 Why You Want to Register This Software

This is OSR's first shareware product, and depending on how many people
register it, we hope to be able to do many more of similar quality and
utility.  COMPORT took over 200 person hours to write, test, and document.
We trust you.  Please show your appreciation by playing by the rules.

Since you've got a fully functional copy of COMPORT now, why should you
bother to register it?   There are several important reasons:

    o Registered users receive free support for 90 days from date
        of registration...
    o Registered users receive notices of major updates and bug
        fixes to this program...
    o Registration removes the (annoying?) "registration reminder"
        that says "Type <CR> to continue" that you see every
        time you invoke a shareware copy of COMPORT...
    o Continued success of the Shareware principle depends on YOU,
        the user!  Shareware makes software available on a
        "try before you buy" basis, at the lowest possible
        cost.  Doesn't that sound like something worth
        continuing?
    o This is a Copyrighted program made available under the
        specific terms of a license as stated in section 3.0
        of this document.  If you try COMPORT V2.0 and find
        it to be useful, you are legally obliged to register
        it after a trial period of no longer than 30 days.

If you try this program and find it useful, please do register it.
No kidding, we really depend on you sending us your money if you use
this product.  We've gotta register many hundreds of copies of COMPORT V2.0
in order to make back our investment.  So please, help out.  How else can
Shareware authors pay bills and continue to write Shareware programs?


5.0 Installation

COMPORT V2.0 is distributed as a compressed library (archive) file named
COMPRT20.ZIP.  This file contains:

    README.1ST    A basic overview of COMPORT, a list of the
            files in the archive, and quick start instructions.
    COMPORT.DOC    This file - User documentation for COMPORT
    REGISTER.FRM    COMPORT registration form.  Please use it if
            you find COMPORT useful.
    COMPORT.EXE    The executable COMPORT program.

Installation simply involves unpacking the library file, and placing
COMPORT.EXE where it can be conveniently executed, typically in a
utility directory on your PATH.  For example, if you path statement
is:
    PATH=C:\DOS;C:\UTILS

You might wish to copy COMPORT.EXE to the UTILS directory so that it
may be conveniently executed from any directory.


6.0 DOS Communications Background (and tutorial)

Tbis section comprises tutorial and background information about how
DOS configures serial (COM) and parallel (LPT) ports, and how COMPORT
modifies the BDA to make previously inaccessible ports available.  It
also describes the different types of Universal Asynchronous Receiver
and Transmitter (UART) chips used in different serial port implementations.

If you're already familiar with how DOS uses the BIOS Data Area (BDA) to
map COM and LPT numbers to port addresses, and know (or don't care about!)
the differences between a 16540 and 16550AFN you can initially ignore this
section and skip ahead to section 7.0 "Instructions for Using COMPORT".
Since this section does contain information on precisely how COMPORT
works with the BDA, it will probably be useful for you to read the section
fully at some point, however.


6.1 COM and LPT Name to Port Address Mapping

Like the BIOS in the original IBM PC, many BIOSes support only 2 serial
ports.  Some support only 1 parallel port.  However, well known default
addresses for COM1-COM4 and LPT1-LPT3 have evolved over the years since
the original IBM PC was built.

To understand how COM and LPT port names are associated with addresses
it's important to realize that the names COM1, COM2, COM3, COM4, LPT1,
LPT2, LPT3 are really just LOGICAL names.  There are no set physical
port addresses associated with these names.  The name to port address
mapping is done using a table called the BIOS Data Area (BDA).

The BDA is stored in memory (RAM), and is built by the BIOS each time
the system is booted.  The BIOS uses its own pseudo-proprietary algorithm
to search for serial and parallel devices at some small number of
expected addresses.  Logical COM ports names are associated with addresses
by checking to see if serial ports exist at various addresses.  As ports
are found, they are assigned in turn to the next available logical COM
device name.  Logical LPT ports are assigned addresses the exact same way,
using a separate list of addresses.  So, for example, if the first serial
port found in the system is discovered at address 03F8h, the address 03F8h
is placed in the BDA in the slot corresponding to COM1.  Note that A zero
is placed in each entry of the BDA that has no associated port.  So, for
example, if there's no LPT3 in the system, the BDA entry for LPT3 will have
a zero in it.

COMPORT searches for COM and LPT ports precisely like the latest BIOSes
do during their boot sequences.  As ports are found that had NOT been
found by the host PC's BIOS during its boot sequence, these previously
undiscovered ports are added to the BDA.  This addition is NOT permanent,
and is in effect only until the PC is rebooted.  Hence COMPORT will have
to be run each time the system is booted to add the new ports to the system.

The serial port addresses that COMPORT searches, in order, are:

        03F8h, 02F8h, 03E8h, 02E8h

The parallel port addresses that COMPORT searches, in order, are:

        03BCh, 0378h, 0278h

When a DOS utility (such as a communications program) wants to access
COM1, for example, the port address presently associated with COM1 in
the BDA is retreived.  Likewise, when attempting to access one of the LPT
ports.

It is precisely this logical to physical port address mapping that allows
COMPORT to add COM and LPT ports to the system, or change the association
between a particular COM or LPT port name (like, COM1) and a particular
physical port address (like, 03F8h).

Ostensibily so that utilities know which of the entries in the BDA are
valid, DOS also maintains a data structure called the Equipment List Word.
This structure contains, among other things, a count of the number of serial
and parallel ports found by the BIOS during its boot sequence search of
the system.

In practice, this Equipment List Word is inconsistently maintained and
almost never consulted (except by programs which display how many parallel
and serial ports exist in the system!).  After all, as it says above,
any entry in the BDA that doesn't have a corresponding physical port
associated with it has a zero it in.  Hence, there are a small number
of BIOSes that always indicate 4 serial and 3 parallel ports in the
Equipment List Word (irrespective of how many COM and LPT ports were
actual located during boot).  Finally, there are inconsistencies as
to how this word (and other parts of the BDA) are interpretted between
the original PC and the PS/2.

Just for completeness, COMPORT ensures that any changes it makes to the
BIOS Data Area are reflected in the Equipment List Word.  However, in
actual practice, no utility that accesses COM or LPT ports using the
BDA really cares anymore what's in the Equipment List Word.  Also, if
a host PC's BIOS places arbitrary numbers in the Equipment List Word
(as in the example above, where 4 COM and 3 LPT ports are always
indicated) COMPORT won't bother to "straighten this out".


6.2 Types of Serial Port Chips (UARTS)

The original IBM PC used a particular type of chip, identified as an
NS8250 (NS = Manufactured by the National Semiconductor Company), to
implement its serial ports.  To create "100% compatible" clones,
many PC and board makers use either this precise chip or a work-alike
chip to implement their serial ports.

The 8250 has some limitations however.  It couldn't run very fast,
and was never intended to be used above 9600 bps (the original PC's
software enforced this limit).  A whole series of backward compatible
upgrades to this original chip have been created, which allow the
PC to theoreticaly communicate at speeds in excess of 690K bps.

Using the appropriate option, COMPORT examines the UARTs used by each
of the serial ports on the host PC and CORRECTLY identifies its type.
Note that many well know, major vendor supplied, diagnostic and
utility programs have algorithmic errors which cause them to mis-identify
some specific types of UARTs.

When COMPORT scans the serial (COM) ports in a system, it displays
the type of each UART as one of the following types.  Note that
"work alike" chips (i.e. chips that work precisely like, for example,
a NS16550AFN but built by a different vendor) are identified as the
original chip.

Types of UARTs that COMPORT identifies:

    o "8250" -- An 8250 or compatible chip has been identified.
      The 8250 is the original, basic, serial port chip used in
      the IBM PC and many compatibles.

    o "16450/16550" -- An NS16450, NS16550, or 8250A or compatible
      chip has been identified.  These chips are all functionally
      identical.  They are faster than the 8250, and are identified
      by the existence of a "scratch register."  As a point of
      trivia: The 16550 chip actually has a UART, but a serious
      bug in most versions of the chip prevents the UART from
      functioning properly.  16550 chips with non-working UARTs
      are identified as 16450/16550s.  16550 chips with WORKING
      UARTs are identified as 16550AFNs.

    o "16550AFN" -- An NS16550A, 16550AF, 16550AFN, or compatible
      chip has been identified.  These chips offer significant
      improvement over the 16450 series, as they provide input
      and output buffers (known as silos, or FIFOs) with programmable
      interrupt levels.  Chips of these types are identified by
      the existence of such FIFOs.  FIFOs allow support for higher
      speed communications, since interrupts can be reduced from one
      for every character sent or received, to as little as one for
      every 16 characters sent or received.  Many communications
      programs, as well as Microsoft Windows V3.1 and later, take
      advantage of the FIFO in these UARTS.  As mentioned above,
      NS16550 chips with properly working FIFOs are identified
      by COMPORT as 16550AFNs.

    o "Type 3" -- An IBM Type 3 Serial port chip or compatible
      has been identified.  These chips are the most sophisticated,
      fastest, and provide support for the highest communications
      speeds of any of the present UARTs.  Found in some IBM
      PS/2s, these chips support Direct Memory Access (DMA)
      transfers, thus freeing the CPU of the task of moving
      data from the serial port to a buffer in memory.  Serial
      port speeds in excess of 690K bps are, at least theoretically,
      possible with these enhanced serial ports.


7.0 Instructions for Using COMPORT

COMPORT is invoked as follows:

        COMPORT [option[-]] [option=add]

To invoke COMPORT with its default options, just type COMPORT followed
by a carriage return.

Each option is preceded by a slash ("/") or a dash ("-") character,
which are treated identically.  Options must be separated from one
another by at least one space on the command line.  Case is not
significant to COMPORT, thus the options "/a" and "/A" are equivalent.
Some options may be disabled by following the option by a minus sign.
Thus, "/A-" specifically disables the "/A" option.

This section contains a brief overview of the COMPORT options.  A
complete discussion of each option follows this section.

There are two classes of COMPORT options, "Display" options and
"Configuration" options.

Display options allow control of what COMPORT displays when it is
invoked.  These options are:

    /A[-]         Display addresses of parallel and serial ports
            known to DOS, as well as types of serial port UARTS.
            DEFAULT = /A (enabled)

    /E[-]        Displays number of COM and LPT ports known to DOS
            according to the BIOS Data Area Equipment List
            Word, as COMPORT STARTS to run.  Therefore, any
            ports found by COMPORT Configuration options are
            not included in these counts.
            DEFAULT = /E (enabled)

    /I[-]        Displays the IRQ (Interrupt Request Queue) number
            associated with each COM port.
            DEFAULT = /I- (disabled)

    /? or /H    Displays a short screen of help information.

Configuration options give control of how COM and LPT ports are configured
by DOS, and allow you to register your copy of COMPORT.  Configuration
options are:

    /S[-]        Requests COMPORT to scan for additional COM and
            LPT ports at their typical default addresses and
            if any are found, add them to DOS.
            DEFAULT = /S- (disabled)

    /Cn=x        Requests COMPORT to configure COM (serial) port
            n (n=1-4) in DOS at port address x (x = hex
            address without trailing "h" or leading "0x").
            DEFAULT = none.

    /Ln=x        Requests COMPORT to configure LPT (parallel) port
            n (n=1-3) in DOS at port address x (x = hex
            address, without trailing "h" or leading "0x").
            DEFAULT = none.

    /R=k        Allows you to REGISTER your version of COMPORT,
            using the registration key ("k") provided to you
            by the author.  Registering your copy of COMPORT
            removes the gentle, but annoying, registration
            reminder that requires that you type <CR> to
            continue COMPORT's execution.   This option
            supersedes any others on the command line.

The following sections provide complete details on each option above, in
alphabetical order.


7.1 /A -- Show Address

This option causes COMPORT to display a list of the COM and LPT ports
present in the system, AFTER any COMPORT Configuration changes have
been completed.  This list is taken directly from the BIOS Data Area
in DOS, and hence is the actual information that will be available to
DOS when COMPORT exits.

The output generated by /A looks something like the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    Current Port Addresses and Types:
        COM1: 03F8h, Type=16450/16550
        COM2: 02F8h, Type=16450/16550
        COM3: 03E8h, Type=16450/16550
        COM4: 02E8h, Type=16550AFN

        LPT1: 0378h
        LPT2: 0278h
        LPT3: (Not present -- Redirected by LAN Mgr)

For each COM port configured in the system, COMPORT displays the port
address and UART (Universal Asynchronous Receiver and Transmitter)
type.  This is done non-destructively, i.e. the baud rate and setup
information for each port is saved and restored by COMPORT.  Also,
please note that UART type is determined CORRECTLY, unlike several
other programs the author has tried in his frustration.

For each LPT port configured, COMPORT displays the port address.  For
LPT ports which are not physically present but have been redirected
COMPORT displays a description of who's doing the redirecting (see below).

Serial (COM) ports are identified as one of the following types.  Refer
to section 6.2, above, for a complete description of the differences
between these UART types.

    o "8250" -- An 8250 or compatible chip has been identified.

    o "16450/16550" -- An NS16450, NS16550, or 8250A or compatible
      chip has been identified.

    o "16550AFN" -- An NS16550A, 16550AF, 16550AFN, or compatible
      chip has been identified.

    o "Type 3" -- An IBM Type 3 Serial port chip or compatible

Parallel (LPT) ports which are not physically present in the system (i.e.
there is no parallel port hardware), but whose logical names have been
redirected to some other device, or are under the control of a network
redirector, receive the following designations:

    o "Not present -- Redirected by LAN Mgr" -- This LPT port has no
      hardware associated with it, and is hence not physically present.
      Instead, it has been redirected by MS net, Microsoft LAN Manager,
      or Digital's Pathworks networking product.

    o "Not present -- Redirected by MODE" -- This LPT port has no
      hardware associated with it, and is hence not physically present.
      Instead, it has been redirected by the DOS MODE command, as in
      the following:
              C:\> MODE LPT3=COM2

      In the above example, the output from LPT3 has been redirected
      to point to COM2.

    o "Not present -- Netware shell loaded" -- For LPT2 and LPT3 only,
       Novell's Netware networking product places a special address
       in the BIOS Data Area when the shell is loaded.  The indicated
       LPT port is redirected by Netware, and is not physically present
       on this system.


7.2 /Cn=x -- Configure COM Port at Specified Address

The /Cn=x option allows the user to specify the address of any serial
port, as well the COM number that address is associated with.  This
information is stored in the DOS BIOS Data Area, and the total number
of ports of each type are updated in the BIOS Equipment List Word.

For this option, "n" is the number of the COM port (1-4) and x is the
hexadecimal address of the associated serial port.  This hex address
may be specified in one to four hex digits, and must not include any
"hex identifying" bytes such as a trailing "h" or leading "0x".
Therefore, the hex address "02E8" is valid, but "0x02E8" is not and
neither is "02E8h".  Hex address "FFFF" is used to request COMPORT
to REMOVE the indicated serial port from the DOS BIOS Data Area
tables (see below for this special use of /Cn=FFFF).  Specifying an
address of zero (as in /C2=0) is not valid).

When a user specified a serial port address using the /Cn=x option,
COMPORT examines the provided hex port address to see if a valid COM
port can be identified at that address.  Thus, if COMPORT is invoked
with the command:

    COMPORT /C1=0278

this requests that COMPORT associate address 0278 (hex) with COM1, and
place this information in the DOS BIOS Data Area.  If a valid serial port
is found at this address (i.e. if one of the four types of serial port
UARTS listed above in section 7.1 can be found at the given address),
COMPORT displays a message such as the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        Verified COM1 at specified address 0278h (added to DOS)

If no valid serial port can be found at the indicated location, COMPORT
will not add the address you provide to the DOS BIOS Data Area.  COMPORT
informs you of this by displaying a message such as the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        ***ERROR: Did not find COM1 at specified address 0278h
                            (DOS not changed)

It is important to note that in either case (valid port found, or no valid
port found) COMPORT informs the user of whether or not the COM port was
added to DOS.

The /Cn=x option can also be used to request COMPORT to remove the
indicated COM port number from the DOS internal BIOS Data Area tables,
though we can't honestly think of a reason that anyone would need to do
this in "real life".  The entry for the port in the BDA is set to zero
by COMPORT.  This is done by specifying hex address "FFFF", as in:

    COMPORT /C3=FFFF

In this case, a message similar to the following is displayed:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        Removed COM3 from DOS

COMPORT places no restriction on the number of times a single serial port
address can be configured into the DOS tables.  Therefore, if, for example,
a particular piece of software that you use prints to COM3 and another
piece of software that you use prints to COM1, and neither allows you
to change these specifications, and you wish to use the same printer
for both (but, obviously not at the same time), you may specify:

    COMPORT /C3=03F8

Where 03F8 is the default address for COM1, and a valid serial port
UART exists at this location.  COMPORT will display something like
the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    Current Port Addresses and Types:
        COM1: 03F8h, Type=16450/16550
        COM2: 02F8h, Type=16450/16550
        COM3: 03F8h, Type=16450/16550

Thereby allowing the serial port at address 03F8 to be accessed as
either COM1 or COM3.

Finally, note that when all COM port changes are complete, the BIOS Data
Area Equipment List Word (see /E, below) is updated with the new count of
the ports configured in the system.  In the example directly above, the
equipment list word would indicate 3 COM ports (even though COM1 and
COM3 share the same address).


7.3 /E -- Display Counts from BIOS Equipment List

The /E option displays the numbers of serial and parallel ports as
indicated by the DOS BIOS Equipment List word, PRIOR to COMPORTs taking
any actions (such as manually configuring any ports or automatically
scanning for additional ports at their default addresses).  The
output from this option looks like the following:


    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    DOS Equipment List Initially Indicates:
        4 serial ports
        2 parallel ports

Users should note that the DOS Equipment List Word is notoriously
inaccurate, and rather than rely on it, most programs simply interrogate
the BIOS Data Area directly.


7.4 /I -- List Associated IRQs for COM Ports

The /I option does the same thing as /A, but adds to the Address List
the IRQ number associated with each COM port.  The IRQ is determined
empirically, by actually generating an interrupt on each serial port
and determining at which address the interrupt occurs.  This is another
area in which COMPORT differs from other programs, which often display
the DEFAULT IRQ most often associated with the indicated device, which
is typically pretty useless.

Conflicting IRQs are the single most common cause of problems in
industry standard PC systems, when adding new hardware options.
Typically, each device that needs to be simultaneously active needs
to have its own IRQ.  So, devices can share IRQs, but such devices
may not be used at the same time.  Hence, it's fine to have a mouse
attached to COM1 at IRQ 4, a modem to COM2 at IRQ3, and a printer to
COM3 also at IRQ3.  It just will NOT be possible to use the modem on
COM2 and the printer on COM3 at the same time (since they share IRQ3).

The /I option to COMPORT results in a display similar to the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    Current Port Addresses and Types:
        COM1: 03F8h, Type=16450/16550, IRQ=4
        COM2: 02F8h, Type=16450/16550, IRQ=3
        COM3: 03E8h, Type=16450/16550, IRQ=5

        LPT1: 0378h
        LPT2: 0278h

Note that the /I option causes COMPORT to "take control" of specific
interrupt vectors in your system during its testing.  For the few
milliseconds that this test is running, COMPORT assumes that nothing
else (mouse movement, floppy disk I/O, or network adapter activity
for example) is happening on the system.  Hence, it is advised
to run COMPORT with the /I option only on a "quiet" system, and not
(for example) with your network loaded. This will ensure accuracy of
results.  Also, if network activity is in progress when COMPORT's /I
option is executed, interrupts could possibly be lost or disabled from
your network interface card.

None of these things will likely cause any damage to your system or
software, they just might limit the cases in which you get an accurate
COMPORT display of IRQs.

While COMPORT attempts to leave all the serial port registers just as
it found them this is not always completely possible, and minor
register changes may occur.  In most cases these will be unnoticed,
but this is another reason to not have any other software simultaneously
accessing the COM ports while COMPORT is!

To keep your system as safe as possible during its checks, COMPORT's /I
option does NOT check for serial port activity at the following IRQs:

        IRQ0    Used by the system timer
        IRQ1    Used by the keyboard
        IRQ2    Slaved for IRQ8-IRQ15

        IRQ8    Used by the real-time clock
        IRQ9    Software redirected to IRQ2
        IRQ14    Used by the hard disk

Hence, if you have a VERY unusual system configuration, and one of your
serial ports uses one of the above IRQs, COMPORT will not properly
identify the IRQ used by that port.  Also, if you have an even MORE
unusual system configuration, and one of the above devices is set to
an IRQ NOT listed above, COMPORT may get confused and report THAT as
the serial port's IRQ.  Again, you'd have to have a pretty unusual
system for that to happen... and if you have such a system you'd already
have to know what your IRQ assignments are!


7.5 /Ln=x -- Configure LPT Port at Specified Address

The /Ln=x option allows the user to specify the address of any parallel
port, as well as the LPT number that address is associated with.  This
information is stored in the DOS BIOS Data Area, and the total number
of ports of each type are updated in the BIOS Equipment List Word.
The /Ln=x option functions very similarly to the /Cn=x option.

For this option, "n" is the number of the LPT port (1-3) and x is the
hexadecimal address of the associated serial port.  This hex address
may be specified in one to four hex digits, and must not include any
"hex identifying" bytes such as "h" or "0x".  Therefore, the hex
address "02E8" is valid, but "0x02E8" is not and neither is "02E8h".
Hex address "FFFF" is used to request COMPORT to REMOVE the indicated
parallel port from the DOS BIOS Data Area tables (see below for this
special use of /Ln=FFFF).

When a user specifies a parallel port address using the /Ln=x option,
COMPORT examines the provided hex port address to see if a device
exists at that address.  This is done by simply accessing the
indicated port address with an IN instruction.  Thus, if COMPORT is
invoked with the command:

    COMPORT /L2=0278

this requests that COMPORT associate address 0278 (hex) with LPT2, and
place this information in the DOS BIOS Data Area.  If a device is found
at this address COMPORT displays a message such as the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        Verified LPT2 at specified address 0278h (added to DOS)

If no device can be found at the indicated location, COMPORT will not
add the supplied LPT port address to the BDA.  Instead, a message such
as the following is displayed:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        ***ERROR: Did not find LPT2 at specified address 0278h
                            (DOS not changed)

It is important to note that in either case (valid port found, or no valid
port found) COMPORT informs the user of whether or not the LPT port was
added to DOS.

The /Ln=x option can also be used to request COMPORT to remove the
indicated LPT port number from the DOS internal BIOS Data Area tables (and
enter a zero in the BDA in its place).  This is done by specifying hex
address "FFFF", as in:

    COMPORT /L3=FFFF

In this case, a message similar to the following is displayed:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        Removed LPT3 from DOS

COMPORT places no restriction on the number of times a single parallel port
can be configured into the DOS tables.  Therefore, if, for example, a
particular piece of software that you use prints to LPT3 and another
piece of software that you use prints to LPT1, and neither allows you
to change these specifications, and you wish to use the same printer
for both (but, obviously not at the same time), you may specify:

    COMPORT /L3=0378

Where 0378 is the default address for LPT1, and a device exists at this
location.  COMPORT will display something like the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Processing manual port address options...
        Verified LPT3 at specified address 0378h (added to DOS)

    Current Port Addresses and Types:
        COM1: 03F8h, Type=16450/16550
        COM2: 02F8h, Type=16450/16550
        COM3: 03E8h, Type=16450/16550

        LPT1: 0378h
        LPT2: 0278h
        LPT3: 0378h

Thereby allowing the parallel port at address 0378 to be accessed as
either LPT1 or LPT3.

Finally, note that when all LPT port changes are complete, the BIOS Data
Area Equipment List Word (see /E, above) is updated with the new count of
the ports configured in the system.  In the example directly above, the
equipment list word would indicate 3 LPT ports (even though LPT1 and
LPT3 share the same address).


7.6 /R=k -- Register COMPORT Using Key

The /R=k option allows a user to register a previously unregistered
copy of COMPORT, using a registration key.  This registration key is
provided by the Author when the registration fee is paid.  The /R=k
option supersedes all other options on the command line, and prompts
the user for his name if the registration key is valid.

Once COMPORT has been registered, your name and registration key will
be displayed each time the program is started.  Further, the annoying
"Type <CR> to continue" message, displayed each time COMPORT is run,
and the reminder to pay your registration fee each time HELP is requested,
will be removed.

To register COMPORT, enter the registration key value supplied in
your registration record, following the /R= option on the command
line.  Do not supply any notation prefixes (such as 0x) or suffixes
(such as h).  Also, the media from which COMPORT is running must be
write-enabled, and you must have write access to the COMPORT image file.
If your registration key were "17765000" you would use the following
command to register COMPORT:

    COMPORT /R=17765000

COMPORT will ignore any other options specified before or after the
/R on the command line.  When the above command is entered, COMPORT
will enter its registration procedure, and display something like
the following:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    Owner Registration Procedure
    Exe file name and path: C:\UTILS\COMPORT.EXE

    At the prompt, enter your username EXACTLY as it appears
    on your registration record.
    Username:

At the above prompt, enter your username exactly as it has been
returned to you in the registration record.  Note that case, spaces,
spelling, punctuation, etc are all significant.  If the registration
key is valid, and it is appropriate for the indicated username,
COMPORT will display a message like the following:

    THANK YOU for registering COMPORT.
    Keep your registration record in a safe place so that you can
    re-register your copy of COMPORT if necessary.

If your registration key is invalid, or if it is judged by COMPORT's
registration procedure to be inappropriate for your username, COMPORT
will display a message such as the following:

    Registration Key or User Name INCORRECT.

    Please check your data and try again!

    ***ERROR: Registration procedure FAILED.

    ***PLEASE register COMPORT!

When the key is invalid, COMPORT remains unchanged.  Thus if you have
been running the shareware version of COMPORT, or a previously registered
version of COMPORT, you may continue to run that version unchanged).

If you're having trouble registering COMPORT after receiving a valid
registration key from OSR Open Systems Resources, recheck the following
points:

    o Do you have write access to the COMPORT.EXE file?  You must
        have write access for COMPORT to be successfully
        registered.

    o Have you entered your registration key precisely as supplied
        on your registration record?

    o Have you entered your username precisely as it was printed
        on your registration record?  Spaces, spelling, and
        punctuation all must be precisely identical to the way
        they appear in your username on the registration record.


7.7 /S -- Scan for Ports at Default Addresses

When the /S option is enabled, if COMPORT finds fewer than 4 COM ports
and fewer than 3 LPT ports configured by DOS, COMPORT will search for
additional ports at the addresses listed below (which have not already
been located by DOS).  As these additional ports are found, they are added
to the DOS BIOS Data Area and the counts in the BIOS Equipment List Word
are adjusted accordingly.  Please see section 6.0 "DOS Communications
Background" for more information on the BDA and COM/LPT to physical
port address mapping.

The serial port addresses that COMPORT searches, in order, are:

        03F8h, 02F8h, 03E8h, 02E8h

The parallel port addresses that COMPORT searches, in order, are:

        03BCh, 0378h, 0278h

Addresses supplied using the /Cn=x and /Ln=x options override the
default port addresses used by the /S option.

When COMPORT is executed with /S enabled, output similar to the
following is produced:

    COMPORT V2.0
    Copyright (c) 1993 - OSR Open Systems Resources, Inc.

    ...Scanning for additional serial ports at default addresses...
        Found COM4: at address 02E8h (added to DOS)
    ...Scanning for additional parallel ports at default addresses
        Found LPT2 at address 0278h (added to DOS)

    Current Port Addresses and Types:
        COM1: 03F8h, Type=16450/16550
        COM2: 02F8h, Type=16450/16550
        COM3: 03E8h, Type=16450/16550
        COM4: 02E8h, Type=16550AFN

        LPT1: 0378h
        LPT2: 0278h


8.0 Support

This is a professionally written piece of software, which is backed by
a top network software development and consulting corporation.  Every
reasonable attempt has been made to ensure this software product operates
in a reliable and predictable manner.  However, this product is supplied
under the terms described in section 3.0 above.

Support for this software product is included in the price of registration,
and is available directly from the author via Compuserve or US mail.
Support comprises answering questions and fixing serious bugs or problems
reported by registered users to the author during the support period.  If
any such problem or bug cannot be fixed, a full refund of the registration
fee will be provided.

We love to hear your suggestions, ideas, compliments, and even complaints,
so please feel free to write.  When writing to report a problem, please
strive to include all relevant information AS WELL AS A DAYTIME PHONE
NUMBER where you can be reached should further information become
necessary.


9.0 Legal Minutae

All trademarks mentioned are the sole property of their registered
owners.  The COMPORT software and this document are Copyright (c) 1993
by OSR Open Systems Resources, Inc., all rights reserved unless explicitly
stated.


10.0 Registration

If you find COMPORT useful, please register it!  You may use the form
on the following page:



        COMPORT V2.0 SHAREWARE REGISTRATION FORM


Thank you for supporting the Shareware concept and registering COMPORT!
Please fill out this form, include your check (drawn on a US Bank) or
money order for US$14.75 payable to OSR Open Systems Resources, Inc., and
mail it to:

        OSR Open Systems Resources, Inc.
        6 Tarn Road
        Mont Vernon, NH  03057-1109

In return, you will receive:
        o Your registration key for COMPORT, which will allow
          you to remove the registration reminder annoyance;
        o Full support from the author for 90 days from the date
          of registration;
        o Notification of major updates and bug fixes for COMPORT;
        o Peace of mind, and a sense of satisfaction at having
          done the right thing!

If you woud like to receive an attractive, laser-printed copy of the
COMPORT V2.0 manual (with fancy type faces, and the like) please send
an additional $5.00 with your order.


    Date:_________

    Name_______________________________________________

    Company (if applicable)____________________________

    Mailing Address____________________________________

    Address 2__________________________________________

    City/State/Zip_____________________________________


Comments/Ideas/Suggestions/Requests for ammendations/Impressions:







PRODUCT: COMPORT V2.0, $14.75