MDTW1234 Revision B by Bonzo.

If you have not constructed an interface circuit, download ALLINONE.ZIP
which contains detailed instructions.

Two new command-line switches are implemented in Revision B.

/OUT will route intercepted data to a second computer for more sophisticated
processing.  A demonstration program called Listener/MDT V1.1 Beta has been
included for your enjoyment.

/H or /? will give on-screen help.

MDTW1234 is a version of the original MDTSTUFF.C with a few new command
line switches.  Com1, Com2 and Com3 are tested and working.  Com4 is not
yet tested but should work just fine.

It is recommended that you construct the All-In-One interface described in the
file ALLINONE.ZIP which is included with this distribution.
ALLINONE.ZIP contains a parts list, construction tips, a circuit diagram
and a suggested board layout, plus tips for first-time builders who
don't know a diode from a resistor.  The files CIRCUIT.GIF and MDTW1234.GIF
are earlier designs of the data slicer.  CIRCUIT.GIF is from the PD204
POCSAG Paging Decoder software and MDTW1234.GIF is the same circuit with
two resistors removed to facilitate use with a discriminator output.
These two files let you see how the ALLINONE has evolved to provide additional
functionality.
  
These plans make use of a 25pin null-modem adapter from your
local computer supply.  It should have a case that can be opened, since
you will build your interface inside this shell AND you will be replacing
the 25pin Male connector with the 25Pin Female connector that you need
to purchase separately.

Revision B of MDTW1234 supports the /OUT command line switch which allows
intercepted data to be routed out the Com port to a second PC for further
processing.  In order to use this facility, you will need to construct
the interface described in ALLINONE.ZIP.  If you do not plan to utilise
the /OUT command line switch, then you can use the MDTW1234.GIF interface
which is a slightly modified version of the PD204 interface described in CIRCUIT.GIF.
Both of these files are included in ALLINONE.ZIP for your convenience.

Connect the second PC to your ALLINONE.GIF interface using a
standard 25pin Serial cable.  No null-modem adapter is required
because the ALLINONE.GIF circuit has incorporated that function.

Revision B also supports /H or /? to obtain online help.

This program supports command line switches as follows:

          /COM:1 - selects Com1 for input from data slicer (default)
          /COM:2 - selects Com2 for input from data slicer
          /COM:3 - selects Com3 for input from data slicer
          /COM:4 - selects Com4 for input from data slicer

          /OUT   - enabled intercepts to be sent out the same serial port
                   to another PC for further processing at 9600 baud,
                   8 data bits, 1 stop bit.  The receiving program will
                   need to enable the DTR line.

          /RE    - reverses input polarity

          /WS    - selects wide-screen (Non-Hex) output to screen
                   (default is Hex-Narrow output)

          /WF    - selects wide-file (Non-Hex) output to data file
                   (default is Hex-Narrow output)
                   This file is suitable for keyword searches and
                   takes less space than the hex-character equivalent

The standard IRQs and base addresses for the Com ports are used.

A program called DRIV1234 has been supplied with this package.
It runs MDTW1234 repeatedly, and saves the output in a timestamped
file for later review and keyword search.  Pressing F1 will cause
DRIV1234 to terminate.

All source code is included for your enlightenment.  Please post
any comments regarding this program to rec.radio.scanner or
alt.radio.scanner with "MDTW1234" in the Subject.

If you run into problems, please read the MDTW1234 FAQ at

  http://spectrum.base.org/

  or

  http://www.geocities.com/SiliconValley/Lab/1067/

and watch "spectrum" for future updates to MDTW1234 and Listener/MDT.


-Bonzo-