No - but perhaps you can use one of the existing ones out there already. The French use Minitel for accessing telephone directorys and things, perhaps you could start there. There are java ones floating around and one of these could be the basis of what your looking for.
You don't say if its serial or TCP/IP you are looking to connect over.
As far as I know Minitel emulation would be mainly a question of ASCII character code to Block graphics emulation. There was a number of chipsets about doing this for simple computers and searching for data on these might help you put together your own system. In particular I remember the Mullard SAA5050 chip used in an English computer the BBC Microcomputer.
PDF data sheet
http://www-sup.csx.cam.ac.uk/~bjh21/BBCdata/
SAA5050.pdf
Check out http://www.wanadoo.fr
enter the following in the search page: -
minitel logiciel
