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A2060 Arcnet LAN Adapter Card
This card was a LAN for Arcnet networks. Please note that Arcnet is a completerly different network topology from Ethernet: so it is impossible to use this card to connect to an ethernet network, even if it is a coaxial 10Base-T network.
General Description (from the "A2060 System Schematics")
The A2060 is an ARCNET controller designed for use with the A2000 computer.
ARCNET is a local area network utilizing a self-polling "modified token
passing" scheme operating at a 2.5 Mbit data rate. A "modified token
passing" scheme is one in which all token passes are acknowledged by the
node accepting the token. The token passing network avoids the fluctuating channel
access times caused by data collisions in so-called CSMA/CD schemes such as
Ethernet.
The A2060 plugs into one of the 100 pin expansion slots in the A2000. The BNC
plug on the rear of the A2060 connects to the network in daisy chain fashion
with the special "T" connector and BNC to BNC cable included. Note
that most network installations will requaire additional cabling and active
links, and that network software is not included.
Notes
Here are some notes taken from an old print of a non existent web page at National Amiga (Greg Scott):
"The A2060 has some bugs. First, the "hybrid" chip that forms the electronic interface to the Arcnet network comes in two different versions: HCY 9058 (for bus networks) and HCY 9068 (for star networks). As the A2060 manual describes it, the board is for a bus network, but many A2060s come with the 9068 (star) hybrid installed. A bus network needs 93-ohm terminators at each end, and this works fine with the 9058 (bus) version of the hybrid. With the 9068, however, the hybrid itself performs the termination. To connect two machines with 9068 hybrids, run coax from one machine to the other, without using terminators. Using T-connectors to attach more machines in the middle of the bus may or may not work, due to each one adding its termination to the bus. To connect a 9068-version A2060 to a bus network of 9058-version A2060s, place it at the end of the chain and connect the cable directly, without a terminator (this may limit the network to only being operational when the 9068-equipped machine is on). Both versions of the card should have no problems when attached directly to an active hub. It is also possible to replace the HCY 9068 hybrid with the 9058 version, provided you can locate one.
There are also several well-known problems with version 37.2 of the "a2060.device" driver software. Replacements for this driver are available in the comm/net directory of Aminet. Some commercial networking packages like Envoy 2.0 also include much better replacement drivers."
Downloads
This is what I found on Aminet searching for A2060:
Name Directory Size Age Description
ch2060_37.23.lha comm/net 6K 349 Sana-II-Device for the A2060 A2060.txt docs/rview 15K 390 Ports: Commodore A2060 Arcnet card A2060.txt hard/hack 1K 293 Modify the A2060 for A4000
Further information will come soon...
 dpmworld
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