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1991-10-15
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83 lines
Notes on HamComm 2.0: Paderborn, October 15th 1991
- HamComm is not public domain and it is not shareware: it's FREEWARE,.
The author keeps the copyright and all other rights.
You are NOT allowed to:
- make any modifications to the program
- distribute the program without this file
- take more than $10 for distribution including all costs
You ARE allowed to:
- use this program freely for any non-commercial purpose
- make as many copies as you like and give them away
You don't have to register, don't have to pay anything and i don't
expect any donations. (but i take 'em :-)
- HamComm is a program for ham radio communications. In its current
state it supports reception and transmission of amateur radio teletype
(RTTY) and Morse code (CW) signals. The interesting thing about it is,
that it doesn't require a converter, not even a modem chip. The audio
output of the transceiver is connected to the serial port of any
PC/XT/AT compatible computer thru a very simple and low-cost circuit.
Only one IC is needed (Op-Amp LM741 or similar) and a few diodes,
capacitors and resistors. For transmission the speaker output is
connected to the microphone input of the transceiver thru a passive r/c
filter. Audio frequency decoding and serial/parallel conversion is all
done by the program.
- HamComm will automatically detect the type of video adapter in use.
MDA, CGA, EGA, VGA and Hercules are supported. All graphics routines
are written in assembler for speed. No attempt has been made to avoid
screen flicker (snow) on cheap CGAs.
- HamComm works on XT maschines, but the graphics displays of the input
signal are more fun to watch on an AT-class maschine. Nearly all of
the functions can also be controlled by using a mouse. A harddisk is
not required. All texts are written in english and the online help
system includes the schematics for the interface circuit. There are
also predefined standard phrases, a QTH distance/direction calculator
and a callsign decoder. Currently about 310KB of free ram is required.
- HamComm will probably NOT run under any kind of multitasking software
like Desqview, Windows or OS/2 since it needs direct control of the
interrupt controller, timer chip and serial I/O hardware.
- On startup the program automatically searches for a configuration file
called "HC.CFG". The current directory is searched first, then all
other directories in the current "PATH" environment variable.
A sample config file is provided. Read it carefully and make the
required adjustments using your favourite text editor. If you find
yourself unable to select COM1 from the PORT menue then this is the
right place to look.
- The converter schematics are included in the online help texts.
To see them do the following:
1. Start the program,
2. Hit ALT-H to start the help subsystem,
3. Hit the letter 'O' to select topic 'Overview',
4. Hit the TAB key to select topic 'Converter' and hit return,
5. Scroll the help text using the cursor-up/cursor-down keys
and read the text.
- Option '-l43' on the commandline will switch to 43 line ega mode.
- Option '-l50' on the commandline will switch to 50 line vga mode.
- The author can be reached via the packet radio mailbox system. Send
your error reports and comments to "DL5YEC@DB0BQ". If you have access
to e-mail then try "uunet!nixbur!schroeder.pad". If you have access to
Usenet you can post HamComm related questions to newsgroup
"rec.radio.amateur.misc".
- Special thanks go to OM Winfried (DL1YCE) and OM Ben (DL6RAI) for
numerous hours of testing and many helpful suggestions.
Have fun!
73 es 55 de Django DL5YEC
If you like HamComm, tell your friends about it.
If you don't, tell me why.