Charlieman said:

No. Let's understand that we are talking about 68K accelerators. And about PDS slots, which are substitutes for the native processor.

Accelerator boards tell the on-board processor to close down. No drivers required in the 68030 world. 

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I'm talking about the Radius16 I had in the SE's PDS and PowerCache Cards, all of which require drivers to tell the CPU to take a nap/control panels to turn them on and off and to tweak settings like cache and Math processes.. In the 68k World, the only processor card upgrade that would not need a driver that I can think of offhand would be for the Blackbirds. I've never gotten my BlackBird bits and pieces up running, but it appears to be the same plug-n-play deal as the G3 ProcCard Upgrade in my 1400c.

edit: PDS is not a substitute for the native processor, it's full access to that processor's I/O at the rate of the system clock for all but a couple of oddball cases like the IIfx and the Portable.