<[EMAIL PROTECTED]> wrote:
> [...]
> RG 62A/U type is written there. BTW the cards didn't come from the same
> source, they just have the BNC connector so I'm being optimistic.
Ah, it's coming back. RG62 *IS* one of the ARCnet cable types. If you got a
mixed batch, there may be some Ethernet in their as well. I can't imagine
DEC doing ARCnet (though they could have I suppose).
Another dead giveaway for ARCnet is that each card will have a small, black,
rectangular block of circuitry on it that looks like it's been dipped in
tar. That's universal to all (so far as I know) and is the reason for the
compatability between brands -- someone (I've long since forgotten who)
owned that chunk of circuitry and licensed it out to the other
manufacturers.
> terminator is 50 Ohms I appear to have only one, so will go back to
source
> and see if another is kicking around in the dusty corner.
You could plug one end of the cable directly into the hub, then simply
terminate the end station's Tee connector -- at least with some flavors.
> also have (from same source as cards) some weird little jobbies that look
> to convert RJ45 to BNC and have a small side cover plate that exposes two
> places to insert wire with a screw on each to tighten down the connection.
> They're only marked "Northern Telecom BU1002TX R4T5
Look around, but that has got to be a balun. Used to simplify cabling and
also as a poor man's way of dealing with ground impedance mismatches on long
cable runs. The lil' transformer isolated the two ends. That's what I
remember anyhow!
> I have 3 ISA cards, (another one from another source still sitting out in
> the car), they have two jumpers. M1 and M2 in an area labled as E@ and a
> diagram that offers the following choices:200h, 280h, EISA EEPROM No
> switches on rear, just one BNC connector and one diode.
No bank of switches anywhere? Hmmm...
> Nifty! If I can get my paws on another terminator I may be in
> business. Also, can I get away with sticking an RJ45 card on and using
the
> funny little adapters? That would increase the NICs available to play
with.
Try just sticking one end in the hub, the other in the station. I think most
ARCnet supported that. Man, I have forgotten SO MUCH of this stuff.
> yes, when I was free I was going to stick the fcc, model numbers, etc into
> Metacrawler and see what crunches out
> hub allows up to 6 nodes and has it's power supply!
> The cards I have here are by digital, fcc: AO9-DE203 Yes, first is a
> letter O, second a zero.
Hmm. I find a "Digital EtherWORKS III ISA adapters (DE203/DE204/DE205) " on
the Compaq (Digital) website. That sort of blows away the ARCnet theory. I
wonder if you've got some ARCnet cabling and ethernet nics. In that case,
find some other cabling and use the correct (50 ohm) terminators at each end
of the bus!
Good luck -- sounds like a fun project.
- Bob
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