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A2060
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1994-02-20
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Path: menudo.uh.edu!usenet
From: markus@techfak.uni-bielefeld.de (Markus Illenseer)
Newsgroups: comp.sys.amiga.reviews
Subject: REVIEW: Commodore A2060 Arcnet card
Followup-To: comp.sys.amiga.hardware
Date: 20 Feb 1994 23:38:42 GMT
Organization: The Amiga Online Review Column - ed. Daniel Barrett
Lines: 403
Sender: amiga-reviews@math.uh.edu (comp.sys.amiga.reviews moderator)
Distribution: world
Message-ID: <2k8sa2$2cf@menudo.uh.edu>
Reply-To: markus@techfak.uni-bielefeld.de (Markus Illenseer)
NNTP-Posting-Host: karazm.math.uh.edu
Keywords: hardware, telecommunications, Arcnet, Zorro II, commercial
PRODUCT NAME
A2060 - Zorro-II based Arcnet Card for Amiga
BRIEF DESCRIPTION
The A2060 Arcnet Card is a true network device for the Commodore
Amiga. It has become cheap lately and thus is a good alternative to other
network devices.
AUTHOR/COMPANY INFORMATION
Name: Commodore Business Machines
Address: 1200 Wilson Drive
West Chester, PA 19380
USA
[Varies for other countries]
DISTRIBUTION
The card is available from every good Amiga dealer and mail order
company. However, the card is no longer produced, and thus the second-hand
market is open to all prices.
LIST PRICE
Suggested retail price is DM 126.- or about $70 (US).
Street price is about DM 90.- or about $52 (US).
SPECIAL REQUIREMENTS
HARDWARE
Amiga with Zorro-II or Zorro-III slots: A2000, A3000, or
A4000.
Does not work with A500, A600, A1200.
At least 512KB of RAM.
SOFTWARE
Requires networking software such as:
AS225R1 TCP/IP clients;
Envoy network file system and network protocol;
Enlan DFS
Oxxi Novell Client
AmiTCP TCP/IP
and the SANA-II device.
MACHINES USED FOR TESTING
Amiga 2000
Tested with 1 and 2 MB Chip RAM.
4 MB of 16-bit RAM
A2630 accelerator board (4 MB of 32Bit RAM)
(The accelerator board is of course not required.)
A2091 SCSI adapter with several hard drives
AmigaDOS 2.04 and Kickstart 37.175.
Amiga 3000, 2 MB Chip RAM, 8 MB Fast RAM, and several hard drives.
AmigaDOS 2.04 and Kickstart 37.175.
For some further tests, a A2065 Ethernet card was used.
REVIEW
In a general overview, I shall describe the card and the required
software to connect Amiga machines. I then will review the installation and
the functionality of the card and the software.
GENERAL OVERVIEW
Arcnet is a basic hardware protocol for information exchange between
computers. Onced connected, these computers represent a Local Area Network
(LAN) and allows a group of people to share resources through the network on
other machines at other locations. The main computer in the network is
commonly known as the "file server," and the other computers are known as
"clients."
The Arcnet networking system is very old, introduced in the early
1980's, and was popular in the days of IBM XT compatible machines. As XT
machines had an 8-bit bus subsystem, and the Arcnet Interface was not the
fastest available, and was soon replaced by the faster ethernet protocol.
Still, Arcnet is cheap and reliable, which makes it useful for small
LANs and simple network sharing. Of course, it has been improved upon in
both speed and functionality.
The manual claims that Arcnet is able to support up to 256 nodes
(machines) and that the speed is about 2.5 Mbps (megabits per second).
Let's see what we really get.
REQUIRED SOFTWARE
On top of the hardware protocol Arcnet, we need software to provide
file sharing or other kinds of network services. Available for the Amiga
are the following protocols:
Commodore AS220 R1 TCP/IP stack & clients (never made available :-)).
Commodore Envoy file system and network protocol (available now!).
Enlan DFS DEC-Net software.
Oxxi Novell Client software.
AmiTCP freely distributable TCP/IP stack for the Amiga.
The TCP/IP stack protocol is very common in most LANs, and is also
used in the Internet. It does provide clients to transfer files to and from a
remote machine or server (ftp, rcp, nfs), run programs on a remote machine
(rsh, telnet, rlogin). It also provides servers (daemons) to make files
available for other machines (ftpd, nfsd) or to allow other people in the
LAN to start programs on the Amiga (telnetd, rlogind).
TCP/IP allows you to connect computer platforms other than Amiga to
your LAN; i.e., Unix platforms or even PC-based LANs (if they can be
connected with Arcnet).
The Enlan DFS system allows you to connect your Amiga to a LAN with
Digital Equipment DECstations running DECNet. Just one problem: DEC does
not support Arcnet.
Oxxi provides a Novell Client for the Amiga and allows you to share
the provided services of a Novell LAN (based on Arcnet).
AmiTCP currently is the only available TCP/IP stack protocol for the
Amiga, as AS225 R1 from Commodore is no longer supported and AS225 R2 is
still not available. AmiTCP is freely distributable and is available on the
Aminet ftp sites. As full source code is provided, it is possible to
program your own clients.
The Commodore Envoy system is available right now and is probably
the best choice for Amiga-only LANs. Envoy can be purchased from Amiga
dealers and mail order companies. A review of Envoy will probably follow
soon.
Currently it is not possible to run AmiTCP and Envoy at the same
time without problems (gating).
Between the bottom layer Arcnet hardware and the top layer software
(TCP/IP, DECnet, Envoy), there is a middle layer which handles data transfer
between the hardware and the software protocols. This aids hardware
independence. On the Amiga, this layer has been defined by Commodore and is
known as "SANA-II." This is the hardware-dependent layer and provides
device drivers for the hardware which can be then accessed by the software
layer.
Hardware: Arcnet Ethernet Serial Parallel
\ | / /
Interchange: SANA-II Interface
/ | \
Software: TCP/IP Dec-Net Envoy
The SANA-II software -- that is, device drivers -- is freely
distributable and can be found on Aminet or Fish Disk 779 (and possibly
later Fish Disks).
For the A2060 Arcnet Card, we need the A2060.device.
INSTALLATION
The A2060 card comes in a box together with a 2-meter long, shielded,
coaxial cable, a BNC-T connector, one Terminator Cap and a small (English)
manual.
The card is a full-length card for the A2000 which also fits easily
into the A3000 and A4000. The installation is very easy but should be done
by a qualified technician if you have two left thumbs.
[MODERATOR'S NOTE: If you are not comfortable opening up your
Amiga, then you should have the work done by an authorized Amiga
service center. Opening your Amiga yourself may void your warranty,
and careless work may even damage the machine. - Dan]
The manual explains in detail the installation of the card into an
A2000, but the explanation can be adapted for the A3000 and A4000.
Now we come to the step where we connect the machines.
BUG!
The manual explains that the A2060 ARCnet uses a bus network layout.
Unfortunately, this is only partially correct, because most of the new A2060
cards (produced in the years 1992 and 1993) have a hybrid chip (the part on
the card which is responsible for the communication on the cable) which
allows only a star network configuration.
We made lot of tests before we detected this bug. It is impossible
to connect more than 4 cards in a star network, and thus the claimed 256
nodes in the bus can never be achieved without any prevention. You either
need to have active hubs and passive hubs (some sort of expansion or
repeater in the bus) or need to exchange the faulty hybrid chip. The latter
is by far cheaper.
The hybrid chip which is able to drive the bus network is named HCY
9058, and the star network hybrid HCY 9068.
Tests showed that once this patch is done, it is possible to connect
more than 8 Amigas without any problems. If you don't have more than 4
machines to connect, don't bother about this problem.
You can circumvent the problem using gateways; i.e., an ethernet
backbone or a machin