Check the PDS pinouts in the DevNotes for the two. There's a
/NuBus signal on the IIsi PDS that's Missing on the SE/30 PDS.
I haven't checked it out yet, but if the NuBus Card in the Adapter is mapped to a different Slot Address than the PDS Cards in the IIsi, then
/NuBus is likely the interrupt (whatever?) for for that particular Slot Assignment.
Take a look at the DuoDock DevNote as well, the NuBus Transceivers are identical(?) to the Transceivers on the IIsi NuBus Adapter and operate independently of the rest of the DuoDock PDS functions.
The Transceiver Chipset is made up of standard TI Parts and the Data Sheets are available online.
That's all I can think of off the top of my head at lunch time . . . :-/
Check it out! [}
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