Color Classic 030 with FPU has been accelerated approximately 8-times as compared with the FPU-less model. 030-FPU operates faster than 040non-FPU. It may be more effective to add FPU than the upgrade to 68LC040, when the applications which you use often make use of FPU processing.
You can't add FPU to LC575 logic board.
You must exchange 68LC040 for 68040 including FPU, in this case.
Directing arrow is seen at the socket (some has no directing arrow). The corner pointed by the arow is cut into triangle. So, you never fail into insertion of FPU direction.
FPU used in this machine is MC68882.
You should pay attention to movement frequency of wave.
FN**A following pattern number shows movement frequency of wave.
Color Classic needs FN16A or over, and ColorClassic2/Performa275 need FN33A or over.
FPU is installed by pushing into the socket with putting the direction. After that, processing speed may be accelerated, when application is corresponding.
It's very easy :-)