9600 Baud FSK Packet-Radio Modem for Atari ST

Simple & Cheap 9600 Baud FSK Packet-Radio Modem

For Atari ST Computers with Built-In Serial Port

-> Working on putting my old qsl.net site back up! Some files are still missing, but it's getting there i hope.<-

This Packet-Radio interface is compatible with Atari ST equipped with a built-in serial port. With use of the standard SP software for Atari ST, the external TNC have been replaced by a simple, low-cost 9600 Baud FSK modem.

Total material costs: approximately $15 USD.

Specifications & Credits

Modem: Simple & Cheap 9600bd FSK modem with driver for Atari ST or PC.
Developer: Developed by OE5DXL.
License: HAMWARE (c) OE5DXL; commercial usage is strictly prohibited.
Driver: Resident multi-port AX.25 driver for IBM compatibles or Atari ST.
Features: 9600bit/s FSK with G3RUH-compatible scrambler, powered directly from the serial port.
Interface: Terminal-Interface with WA8DED-Hostmode.

Build Details

The home-built 9600bd Packet-Modem is fully functional and requires no specialized parts. It operates using only a 74HC123 and a TL064.

Software & Documentation

Download L2STXDUO.ZIP (240KB) includes:

The system driver
PCB layouts and circuit diagrams
German documentation

Supports both 9600bd FSK and 1200bd AFSK (switchable, not simultaneous).

Hardware Limitations

Gateways require two MFP chips. Atari TT has two; standard STs have one but can be modified.

Atari Falcon (F030) is unsupported without a MAX232 modification.

Requires a Hostmode-compatible terminal such as SP6.5 or DigiPoint 4.10.

For comments or suggestions:
[email protected]

HAMWARE Project (c) OE5DXL - Non-Commercial Amateur Radio Use Only