I recently got hold of a Cyberstorm MK1 040@40 for my A4000d. Unfortunately, I cannot get it to work when a BigRamPlus is installed in the same system (no boot, not even an early boot menu). Removing the BigRamPlus results in a booting system. Replacing the Cyberstorm with an A3660 (and keeping the BigRamPlus) also works fine. Is there a known incompatibility between the Cyberstorm and BigRamPlus?
System details: Buster 11, ZZ9000 RTG, X-Surf 100 + RapidRoad and A4091 scsi controller. Motherboard is a rev B and has been recapped/repaired last year.