old cirrus logic 5420 1mb ISA bus. because it was slow, and couldn't display more than 800x600 (which wastn really a problem at the time when 800x600 was most popular).......nothing really wrong with it though.
In contrast, the best card i ever had was 8800gts 640mb, which i still have in my htpc and still plays some less demanding games like fallout or Brutal Legend at 1080p no problem. The nvidia 8800 series were the biggest improvement in 3d graphics performance so far i think.