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Drivers for seemingly obscure UMC ethernet LC PDS E420 card

Posted by: BurntOutElectronics on 2026-07-06 21:28:20 Hello all, Keeping in mind I'm a relative newbie to vintage Mac gear (although I've already recapped the LC III motherboard and PSU), I can't for the life of me find information or drivers for this ethernet card that came in this computer. I'm assuming I can't set it up in Mac os 7.5 until I have some sort of driver extension installed. Here's the specimen. I'd like to play around with this LC online a little, and perhaps set up a vlan and try Globaltalk which I've just stumbled upon. Any help is appreciated. Lance

Posted by: finkmac on 2026-07-06 21:39:07 have you tried to use it yet? quite a few ethernet cards will Just Work with the stock Apple drivers.

Posted by: BurntOutElectronics on 2026-07-06 23:16:13 Okay progress update. I tried a different ethernet cable with the card, now getting a solid green light and I can see it pop up on my router with the fixed IP I assigned it on the Mac. However when I try and ping the router or another computer it fails. When I try and ping the mac, windows tells me it's unreachable. I tried both 56 and 32 byte packet sizes. But it at least seems that the network card is working without an additional driver

Posted by: arroz on 2026-07-12 07:05:06 Hi! Can you post a picture of your MacTCP configuration (both the main window and the detailed configuration window)? As others said those cards tend to work without drivers more often than not. And if you can see the Mac on your router it’s very likely working. So it’s just a matter of IP configuration which in MacTCP was a bit messy. Regards Miguel Arroz

Posted by: Realitystorm on 2026-07-12 16:40:44 I have had issues will connecting these old cards directly to modern routers, I had to put an old 10/100/1000 switch in between.

Posted by: nathall on 2026-07-18 20:29:58 Wouldn’t have anything to do with JP1, set in your picture to BNC and not twisted pair, would it? I’m assuming you’re using CAT5/twisted pair and not BNC.

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