The schematic is as simple as a 5v power supply and a 5v<>RS232 level converter (ie, a MAX232). The module has a standard 19200bps serial interface to it.

I'm planning to move to a 115200bps link to another microcontroller (probably a mitsubishi 16c62 series - though if I told you what else that was going to appear in, I'd have to kill you) which will then drive the display over SPI - either that or I'll drive the display direct and try and get greyscales.

Hugo