Specifications

Basics Processor-Direct Slot (PDS) - 7
Processor-Direct Slot (PDS)
The LC-processor direct slot (LC-PDS) is compatible with
the PDS in the Macintosh LC family of computers, but it is
not a true PDS. While this expansion slot supports many
PDS cards designed to operate with the MC68030 bus, some
of those cards do not work. PDS cards designed to interact
with the main processor—to provide, for example, a RAM
cache or an FPU—will not work in the I/O expansion slot.