HamComm is a program for ham radio communications. It supports reception and transmission of radio teletype (RTTY), AMTOR ARQ/FEC SITOR A/B, NAVTEX and Morse code (CW) signals. A decoder for SHIP and SYNOP reports from weather stations is also included HamComm does not require an RTTY 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 low-cost interface 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. There is also a tone signal available at the COM port without any modification to the computer. Audio frequency decoding and serial/parallel conversion are all done in software 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 to some degree on XT maschines, but the graphics displays of the input signal are more fun to watch on an AT-class computer. Nearly all of the functions can also be controlled by using a mouse. A harddisk is recommended but 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 370KB of free ram is required HamComm will probably NOT run under any kind of multitasking software like Desqview, Windows, Windows NT or OS/2. It needs direct control of the interrupt controller, timer chip and serial I/O hardware
