They still sold a 80487, of course. It was a '486 without the FPU being fused off, and when you plugged it into the "math co-processor" socket, it disabled the

They still sold a 80487, of course. It was a '486 without the FPU being fused off, and when you plugged it into the "math co-processor" socket, it disabled the original CPU and took over both duties.