The first version of Scala was released in 1990 if I'm not mistaken, he probably used a later version as he was using a A1200 which had the AGA-chipset that improved graphics considerably. He'd been using it "for about twenty years", and as this was two or three years ago and the A1200 was released in 1992 he probably had a 22 year run on the same hardware and software. He didn't specify the card he used, but I think it's safe to say it was the Video Toaster given its popularity at the time.