Me and my friends were involved in creating the hardware and the software. We were pioneering in Germany.
This version V4.7 was written in ACTION!
Hardware features:
Modem connecting Atari and Radio. Baudrate limited by CB radio bandwidth. Modulation: PSK about 800 bit/s achived
Controlling PTT of CB radio, using 1010 cassette motor control signal
Connected to SIO serial like a floppy drive with the same RX/TX lines
Also hardware enhancements like blinking LED if message arrived or switching relais to an output device connected to joystickport. Allowing turning on/off other devices.
Software
Simple chat-mode, sending messages, broadcasting messages to others
Binary file transfer to send the latest sw update to the partner (scheduled, by night)
First version in Atari basic, was rewitte to ACTION! Had a nice colourful screen.