I had a Mac Plus and found a card that would clip-on to the 68000 and takeover the system at boot time. It had a fast 68020 and 68882 math coprocessor on it.

I had a Mac Plus and found a card that would clip-on to the 68000 and takeover the system at boot time. It had a fast 68020 and 68882 math coprocessor on it. It also came with a fan to get the extra heat out of the box. Ran great. Good times.