Up for sale is the FPU math co-processor for the Macintosh Color Classic. There is a socket on the logic board to easily drop this co-processor into your CC and speed it up! This makes math-intensive tasks go faster, and speeds up your ancient computer between 25 and 300% depending on the task. Please don't expect a miracle- the original computer was pretty slow! Apple personal diagnostics rates the CC at a 5 in benchmarks without the FPU and a 12 with it. See benchmark screen shots. If you want a maxed out Color Classic, this is the chip for you!