I just found a small weirdness.
I have a Compact Flash card reader and a 1 meg Apple issue memory expansion card in my Platinum IIe . I was attempting to check out the installed memory chips in the memory card, and found that it can't perform it's self (built-in) diagnostic routine with the CF card plugged in. I unplugged the CF card and then the routine worked great.
Just thought I share this, in case someone else runs into this problem. I would have posted this note on the CF project site, but it has been altered, and I couldn't find a message board.