Cards in the PDS are accessed at 20MHz. This speed should let developers create PDS cards without using expensive components while still providing access to the processor bus. There are two locations in the memory map for PDS cards. Developers should see the Cards and Drivers Manual for information on creating PDS cards. This manual is available from APDA.
The cache connector in the Macintosh IIci may look like the Macintosh IIfx PDS connector, but the pinouts are vastly different.
Below a table with differences found in the Apple Macintosh IIfx computers:
D2