I have a couple of old zorro ethernet cards that have BNC connectors.  I need adapters so that they can accept a normal ethernet cable.  I want to make sure I'm getting the right thing, since these connectors are also used for video (not what I want).  Any good leads on where to get a couple of these adapters for my network cards? -- I'm in the USA --  I need the adapter to have a male BNC end to plug into my current cards.  Thanks.

You want a transceiver..
(You don't want a "balun"...)

I think I have some AUI to RJ45, but no BNC anymore...

Transition and Allied (something?) made them...

desiv

desiv

I need the adapter to have a male BNC end to plug into my current cards. Thanks.

similar question asked here.
 
http://www.computing.net/answers/networking/utp-to-bnc-connector/1987.html

A hub would also enable you to build a tiny coax segment for your 10Base2 cards and then use a single hub to adapt that to a twisted pair (RJ45) port. This may or may not work with a coax to twisted pair converter/transceiver.

Watch out: a coax segment is built in a completely different way than a twisted pair network. You will need a T-connector for each network card and the hub. These T-connectors are daisy-chained with RG-58 cable and the first and the last T-connectors are equipped with terminators.

T-connector with cables attached:


terminator:

Amiga network cards which don't have RJ45 have AUI instead.

I've had at least one Hydranet card that only had BNC.

One vote for transceiver from me too, if you have AUI port. I have Hydra's Amiganet 1.1 card with one AUI and two BNC connectors. At first I used hub with BNC, but then picked handful of AUI->RJ45 transceivers from recycling center for free and those were so much more comfortable to use Remember to check your ethernet card if there's jumpers to change when using AUI... in Hydra you had to switch whole line of them.

 Do you think I can use the following adapter if I find a BNC cable with two male ends???

Nope..  That's just an adapter or balun.
You need a transceiver...

I haven't used this brand and know nothing about quality, but a quick e-bay search shows this:

Nope, not that!!

Sorry, that was 10 base 2 to AUI, still searching..
Hmm, not seeing any on e-bay..  
You need 10base-2 to 10-base-t, but I'm not seeing one..  Wonder if you're going to have to go to AUI first?  
You don't also have an AUI on that card?  15-pin connector?

desiv
p.s.  They do exist.  
http://www.cdw.com/shop/products/Transition-Networks-Ethernet-Just-Convert-IT-10BASE-T-to-10BASE-2-Converter/876165.aspx?cm_mmc=ShoppingFeeds-_-GoogleBase-_-NetComm%20Products-_-876165_Transition%20Networks%20Ethernet%20Just%20Convert-IT%2010BASE-T%20to%2010B_TRR-J/E-CX-TBT-02
 But that's spendy and new...

Thanks, everyone, for your input.  Do you think I can use the following adapter if I find a BNC cable with two male ends???

http://www.amazon.com/Media-converter-10Base-T-10Base-2-external/dp/tech-data/B000BMQWSG

No. That item should not be called "media converter" because it isn't. It's a simple electrical adapter that just won't work. A real media converter will require a power supply for instance.

The smallest coax (10Base2) setup you'll require (i.e. to connect the NIC and the converter/hub) is:
- 2 terminators
- 2 T-connectors
- length of RG-58 with BNC connectors

Any further device will additionally require:
- T-connector
- length of RG-58 with BNC connectors

If you've got several coax devices you can set up a small 10Base2 network and adapt that with a single hub / media converter.

Alternatively, if you've only got a single NIC equipped with an AUI port it's much simpler to use an 'AUI transceiver for TP/10BaseT' - paid ~4 € for mine on eBay. I think any model will work.