This is a small dmx-interface for do-it-your-self.
The Schematics are made with gschem.
The PCB's are done with PADS and the sources are lost. We will make new versions soon with a freeware tool (probably eagle).
You don't need the printed PCB. You can also wire-wrap all parts together on a small experimental-pcb, because there should be less that 30 wired to wrap between the parts.
The AT89C2051 must be programmed with a programmer. I'm still searching for a free one.
The package and documentation will be improved soon. However for the impatient here's the current state for download: dmx30.tar.gz updated 2001-09-13