I was thinking that since it is the Rocket running the Slot Manager in Acceleration Mode, not the CPU relegated to hosting the non-NuBus I/O, similar to the 6502(?) I/O co-processors on the IIfx MoBo, the Rocket may be able to pull at least a few rabbits out of its hat.

I'll need to crack the books and DevNotes for info on Interrupt Lines/Slot IDs/PseudoSlot assignments for multi-slot implementations in oter Macs of the IIsi Adapter's NuBus ChipSet. IIRC, it's the same chipset found on the DuoDock (Rev 1) and possibly the IIci, IIcx and earlier II series Macs.

A few patch wires between a NuBus Slot Section hacked from another machine and the NuBus Adapter Bridge ASICs might do wonders for a Rocket running rampant over a brain-dead IIsi! }