Replacing the FPU


The standard FPU for the Sun3-Series is the MC68881. This chip can be replaced by the Pin and Commandcompatible MC68882 FPU. Just take the 68881 out of it's socket and put a 68882 in.


The FPU's ID is U101. The empty solder-field to the left is an empty 68030 socket. In the middle you can see the CPU (MC68020-20) and to the right is the FPU (MC68881-20).


You gain up to 60% Float-Performance or more because the 68882 has a better cycle-time for several FPU-Commands.