27 Oct
1998
27 Oct
'98
10:50 a.m.
-----Original Message-----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Wednesday, 28 October 1998 9:55
Subject: Re: Microvaxen bits etc.
more.
Short answer is no. They don't. Not around here anyway.
Most network cards produced these days don't have AUI ports on them.
Unfortunately all my big (and some smaller) Digital boxen only have
an AUI on their ethernet adapters.
>>While
I'm at it, AUI-10Base2(or t) transceivers are also getting rare,
Odd.. Why on earth should those be rare? Or don't people use AUI ports any
You _might_ be able to raid the 10 base T interface
chip, or the
10 base 2 transceiver chip + isolated PSU + transformers off a PC
ethernet card, make a PCB, and build your own transceiver. A lot of cards
(at least the old cards I hack about with) use standard chips like the
83C92 (10 base 2) or 83C94 (10 base T). The data sheets for the chips
give the application circuits, and most of the bits can probably be
raided off old ethernet cards.
If I get desperate enough. I have no shortage of 10Base2 + AUI 16 bit PC
cards.
I'm really gonna have to find a pinout for the AUI connectors. And how to
connect them.
I have found a source for new txcvrs in Adelaide (finally) but it's rather
more than I had
intended to pay, when a s/h one would do.
If you can find some old 10 base 5 transceivers (thickwire), then by
changing the connector, they'll often work on 10 base 2 networks. It's
not 'official', but it seems to be OK.
Probably, but they are pretty rare as well.
IIRC, I think the difference is only in the signal level injected into
the cable, it's somewhat lower for thick cable due to the lower loss of the
RG8. Modern
ethernet transceivers are rather more sensitive, so unless you had maxed out
the distance to
the full 180 meters or thereabouts, it should work just fine.
Cheers
Geoff
Computer Room Internet Cafe
Port Pirie
South Australia.
netcafe(a)pirie.mtx.net.au
(My other home)