I finally got this Sonnet Presto Plus card successfully working in my Color Classic yesterday, and I have installed Mac OS 8.1 on there. I also have 512k of VRAM installed so I can display thousands of colors!! Also, the 10MB RAM on the board plus the 32MB on the Sonnet Card gives me 42MB of total physical RAM, and I have a 500MB hard drive installed in the Color Classic. A SUPER souped-up Color Classic mega-upgrade!! Yeah, one hell of a machine now!