Thanks for the reply Dave.
The devices are on dinky little demo boards from Sure Electronics: http://www.sureelectronics.net/goods.php?id=665
These come free with some of their lcd modules, or can be bought separately. I bought some just to mess around with, and for some projects I have in mind.
The notes with the boards: http://www.sureelectronics.net/pdfs/DE-LD007_Ver1.0_EN.pdf
show the circuit etc. but the last few pages are a C program which they have used to program the on board pic.
I spent some time as a bit of a learning exercise translating this code to C++ and have got it to ru