The Moreton Bay NETtel is a low cost embedded network appliance. It is designed to be a very flexible embedded engine for creating dedicated networked devices. One of its main uses is as a small network router, providing a gateway/firewall for dialup or cable/ADSL internet connections.
The really great thing about the NETtel is that it is powered by a version of Linux. The NETtel runs a uClinux/ColdFire kernel and tool set. Micro-controller Linux (uClinux) is a port of Linux to run on CPU's that do not support virtual memory.
[...] The only additional hardware required was an Analog to Digital Converter (DAC). I chose a simple National Semiconductor DAC0800 part, they are cheap and easy to get hold of.