Hey man.
I've found your post at
http://www.adventuregamers.com/article/id,685 about the Broken Sword: TAoD game. Maybe I have a solution for your problem with it:
if you want to play BROKEN SWORD 4 with unsoppurted video card, you have to download a program called 3D-ANALYZE (download it from here:
http://www.falconfly.de/downloads/3danalyzer-v234.rar ((it's about 800 kb)) ) or you can visit the official site of the program (
http://www.tommti-systems.de)
after downloading it open the program and press (SELECT) and choose the game. after that check these sittings: (1) force SW TnL (2) emulate pixel shader caps (3) force max. pixel shader version 1.4.
then press (RUN).
I hope it works for you. Hey I have a question for you: do you have the installer (CD or DVD) of this game? I can't find it to buy here in Brazil so maybe you can send me a copy, I dunno.
/cheers