One of my favorite little VidCards for something with severe slot limitations, like your IIci, is the Futura II LX because it has provision for either an Ethernet or a DSP Daughtercard, which saves you a slot! I've got the Ethernet version somewhere in a box around here (hopefully) . . .

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Trash, have you tried that Futura ethernet daughter card with Open Transport?

My experience with the Futura II SX is that the computer will lock up if Open Transport is enabled. Classic Networking works fine though.

I'm wondering if there's anything different about the Futura II LX in that regard or if it has the same issue.

I wish I knew enough Mac programming to have even a hope of a fantasy about fixing the driver problem that causes that.