I know that one is the original Nikon EC-15 card, that's the one I use in my E2. Holds all of five Tiff shots.
The one in the E3s is a Microtech 80 MB, but I can't recall the exact model number and the camera is not with me.
The key is to stay below 128 MB in size, and you need the very old 5 volt 'High Speed ATA Flash'. You can't use a 3.3v card, nor one that's actually faster than what the old High Speed cards were, since they do not assert the proper pins to make the memory controller in the camera happy.
I went thru all this long ago, even attempting to rework a CF card adapter to assert the proper pins. That's when I found out about the memory limitation. The danged controller also knows that the CF card is 3.3v and won't work with it, even with the pins hotwired such that it *should* be happy. The dang thing is too smart for our own good!
Anyway, I'll post the exact model number for that microtech card later. I thhink we need to start another list around here!