I just got a Platinum IIe. I put my 5 1/4 I/O card in the IIe and both drives seem fine. I put my 3.5 Drive controller card (603-9107-A LIRON) in and attached my 3.5 drives (A9M0106) drives, first both daisy chained, then individually. At no time were any of the 3.5 drives accessed. I have the 3.5 card in slot 5 and the 5 1/4 card in slot 6.
Yesterday or the day before, the 4 drives were daisy chained to a IIgs and worked.
Does anyone have any pointers in troubleshooting this?