I bought the SCM PCD-50B SCSI Card Reader a while back, I did some attempt to connect it to the internal SCSI on the A3000, but no cards would ever show up. Never put any further effort in tracking down problem then. Would be interesting to see how easy it plugs into your system. Keep posting!
I would prefer to have the reader in an external SCSI box, ultimately in an A3070.
I also tried to connect the reader to the CyberstormPPC card, but with no luck. Bare in mind CSPPC have UW SCSI3, it *should* work...
Works brilliant with the internal SCSI on A4000T and Trifecta SCSI for A500.