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arcnet-hardware.txt
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arcnet-hardware.txt
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-----------------------------------------------------------------------------
1) This file is a supplement to arcnet.txt. Please read that for general
driver configuration help.
-----------------------------------------------------------------------------
2) This file is no longer Linux-specific. It should probably be moved out of
the kernel sources. Ideas?
-----------------------------------------------------------------------------
Because so many people (myself included) seem to have obtained ARCnet cards
without manuals, this file contains a quick introduction to ARCnet hardware,
some cabling tips, and a listing of all jumper settings I can find. Please
e-mail [email protected] with any settings for your particular card,
or any other information you have!
INTRODUCTION TO ARCNET
----------------------
ARCnet is a network type which works in a way similar to popular Ethernet
networks but which is also different in some very important ways.
First of all, you can get ARCnet cards in at least two speeds: 2.5 Mbps
(slower than Ethernet) and 100 Mbps (faster than normal Ethernet). In fact,
there are others as well, but these are less common. The different hardware
types, as far as I'm aware, are not compatible and so you cannot wire a
100 Mbps card to a 2.5 Mbps card, and so on. From what I hear, my driver does
work with 100 Mbps cards, but I haven't been able to verify this myself,
since I only have the 2.5 Mbps variety. It is probably not going to saturate
your 100 Mbps card. Stop complaining. :)
You also cannot connect an ARCnet card to any kind of Ethernet card and
expect it to work.
There are two "types" of ARCnet - STAR topology and BUS topology. This
refers to how the cards are meant to be wired together. According to most
available documentation, you can only connect STAR cards to STAR cards and
BUS cards to BUS cards. That makes sense, right? Well, it's not quite
true; see below under "Cabling."
Once you get past these little stumbling blocks, ARCnet is actually quite a
well-designed standard. It uses something called "modified token passing"
which makes it completely incompatible with so-called "Token Ring" cards,
but which makes transfers much more reliable than Ethernet does. In fact,
ARCnet will guarantee that a packet arrives safely at the destination, and
even if it can't possibly be delivered properly (ie. because of a cable
break, or because the destination computer does not exist) it will at least
tell the sender about it.
Because of the carefully defined action of the "token", it will always make
a pass around the "ring" within a maximum length of time. This makes it
useful for realtime networks.
In addition, all known ARCnet cards have an (almost) identical programming
interface. This means that with one ARCnet driver you can support any
card, whereas with Ethernet each manufacturer uses what is sometimes a
completely different programming interface, leading to a lot of different,
sometimes very similar, Ethernet drivers. Of course, always using the same
programming interface also means that when high-performance hardware
facilities like PCI bus mastering DMA appear, it's hard to take advantage of
them. Let's not go into that.
One thing that makes ARCnet cards difficult to program for, however, is the
limit on their packet sizes; standard ARCnet can only send packets that are
up to 508 bytes in length. This is smaller than the Internet "bare minimum"
of 576 bytes, let alone the Ethernet MTU of 1500. To compensate, an extra
level of encapsulation is defined by RFC1201, which I call "packet
splitting," that allows "virtual packets" to grow as large as 64K each,
although they are generally kept down to the Ethernet-style 1500 bytes.
For more information on the advantages and disadvantages (mostly the
advantages) of ARCnet networks, you might try the "ARCnet Trade Association"
WWW page:
http://www.arcnet.com
CABLING ARCNET NETWORKS
-----------------------
This section was rewritten by
Vojtech Pavlik <[email protected]>
using information from several people, including:
Avery Pennraun <[email protected]>
Stephen A. Wood <[email protected]>
John Paul Morrison <[email protected]>
Joachim Koenig <[email protected]>
and Avery touched it up a bit, at Vojtech's request.
ARCnet (the classic 2.5 Mbps version) can be connected by two different
types of cabling: coax and twisted pair. The other ARCnet-type networks
(100 Mbps TCNS and 320 kbps - 32 Mbps ARCnet Plus) use different types of
cabling (Type1, Fiber, C1, C4, C5).
For a coax network, you "should" use 93 Ohm RG-62 cable. But other cables
also work fine, because ARCnet is a very stable network. I personally use 75
Ohm TV antenna cable.
Cards for coax cabling are shipped in two different variants: for BUS and
STAR network topologies. They are mostly the same. The only difference
lies in the hybrid chip installed. BUS cards use high impedance output,
while STAR use low impedance. Low impedance card (STAR) is electrically
equal to a high impedance one with a terminator installed.
Usually, the ARCnet networks are built up from STAR cards and hubs. There
are two types of hubs - active and passive. Passive hubs are small boxes
with four BNC connectors containing four 47 Ohm resistors:
| | wires
R + junction
-R-+-R- R 47 Ohm resistors
R
|
The shielding is connected together. Active hubs are much more complicated;
they are powered and contain electronics to amplify the signal and send it
to other segments of the net. They usually have eight connectors. Active
hubs come in two variants - dumb and smart. The dumb variant just
amplifies, but the smart one decodes to digital and encodes back all packets
coming through. This is much better if you have several hubs in the net,
since many dumb active hubs may worsen the signal quality.
And now to the cabling. What you can connect together:
1. A card to a card. This is the simplest way of creating a 2-computer
network.
2. A card to a passive hub. Remember that all unused connectors on the hub
must be properly terminated with 93 Ohm (or something else if you don't
have the right ones) terminators.
(Avery's note: oops, I didn't know that. Mine (TV cable) works
anyway, though.)
3. A card to an active hub. Here is no need to terminate the unused
connectors except some kind of aesthetic feeling. But, there may not be
more than eleven active hubs between any two computers. That of course
doesn't limit the number of active hubs on the network.
4. An active hub to another.
5. An active hub to passive hub.
Remember that you cannot connect two passive hubs together. The power loss
implied by such a connection is too high for the net to operate reliably.
An example of a typical ARCnet network:
R S - STAR type card
S------H--------A-------S R - Terminator
| | H - Hub
| | A - Active hub
| S----H----S
S |
|
S
The BUS topology is very similar to the one used by Ethernet. The only
difference is in cable and terminators: they should be 93 Ohm. Ethernet
uses 50 Ohm impedance. You use T connectors to put the computers on a single
line of cable, the bus. You have to put terminators at both ends of the
cable. A typical BUS ARCnet network looks like:
RT----T------T------T------T------TR
B B B B B B
B - BUS type card
R - Terminator
T - T connector
But that is not all! The two types can be connected together. According to
the official documentation the only way of connecting them is using an active
hub:
A------T------T------TR
| B B B
S---H---S
|
S
The official docs also state that you can use STAR cards at the ends of
BUS network in place of a BUS card and a terminator:
S------T------T------S
B B
But, according to my own experiments, you can simply hang a BUS type card
anywhere in middle of a cable in a STAR topology network. And more - you
can use the bus card in place of any star card if you use a terminator. Then
you can build very complicated networks fulfilling all your needs! An
example:
S
|
RT------T-------T------H------S
B B B |
| R
S------A------T-------T-------A-------H------TR
| B B | | B
| S BT |
| | | S----A-----S
S------H---A----S | |
| | S------T----H---S |
S S B R S
A basically different cabling scheme is used with Twisted Pair cabling. Each
of the TP cards has two RJ (phone-cord style) connectors. The cards are
then daisy-chained together using a cable connecting every two neighboring
cards. The ends are terminated with RJ 93 Ohm terminators which plug into
the empty connectors of cards on the ends of the chain. An example:
___________ ___________
_R_|_ _|_|_ _|_R_
| | | | | |
|Card | |Card | |Card |
|_____| |_____| |_____|
There are also hubs for the TP topology. There is nothing difficult
involved in using them; you just connect a TP chain to a hub on any end or
even at both. This way you can create almost any network configuration.
The maximum of 11 hubs between any two computers on the net applies here as
well. An example:
RP-------P--------P--------H-----P------P-----PR
|
RP-----H--------P--------H-----P------PR
| |
PR PR
R - RJ Terminator
P - TP Card
H - TP Hub
Like any network, ARCnet has a limited cable length. These are the maximum
cable lengths between two active ends (an active end being an active hub or
a STAR card).
RG-62 93 Ohm up to 650 m
RG-59/U 75 Ohm up to 457 m
RG-11/U 75 Ohm up to 533 m
IBM Type 1 150 Ohm up to 200 m
IBM Type 3 100 Ohm up to 100 m
The maximum length of all cables connected to a passive hub is limited to 65
meters for RG-62 cabling; less for others. You can see that using passive
hubs in a large network is a bad idea. The maximum length of a single "BUS
Trunk" is about 300 meters for RG-62. The maximum distance between the two
most distant points of the net is limited to 3000 meters. The maximum length
of a TP cable between two cards/hubs is 650 meters.
SETTING THE JUMPERS
-------------------
All ARCnet cards should have a total of four or five different settings:
- the I/O address: this is the "port" your ARCnet card is on. Probed
values in the Linux ARCnet driver are only from 0x200 through 0x3F0. (If
your card has additional ones, which is possible, please tell me.) This
should not be the same as any other device on your system. According to
a doc I got from Novell, MS Windows prefers values of 0x300 or more,
eating net connections on my system (at least) otherwise. My guess is
this may be because, if your card is at 0x2E0, probing for a serial port
at 0x2E8 will reset the card and probably mess things up royally.
- Avery's favourite: 0x300.
- the IRQ: on 8-bit cards, it might be 2 (9), 3, 4, 5, or 7.
on 16-bit cards, it might be 2 (9), 3, 4, 5, 7, or 10-15.
Make sure this is different from any other card on your system. Note
that IRQ2 is the same as IRQ9, as far as Linux is concerned. You can
"cat /proc/interrupts" for a somewhat complete list of which ones are in
use at any given time. Here is a list of common usages from Vojtech
Pavlik <[email protected]>:
("Not on bus" means there is no way for a card to generate this
interrupt)
IRQ 0 - Timer 0 (Not on bus)
IRQ 1 - Keyboard (Not on bus)
IRQ 2 - IRQ Controller 2 (Not on bus, nor does interrupt the CPU)
IRQ 3 - COM2
IRQ 4 - COM1
IRQ 5 - FREE (LPT2 if you have it; sometimes COM3; maybe PLIP)
IRQ 6 - Floppy disk controller
IRQ 7 - FREE (LPT1 if you don't use the polling driver; PLIP)
IRQ 8 - Realtime Clock Interrupt (Not on bus)
IRQ 9 - FREE (VGA vertical sync interrupt if enabled)
IRQ 10 - FREE
IRQ 11 - FREE
IRQ 12 - FREE
IRQ 13 - Numeric Coprocessor (Not on bus)
IRQ 14 - Fixed Disk Controller
IRQ 15 - FREE (Fixed Disk Controller 2 if you have it)
Note: IRQ 9 is used on some video cards for the "vertical retrace"
interrupt. This interrupt would have been handy for things like
video games, as it occurs exactly once per screen refresh, but
unfortunately IBM cancelled this feature starting with the original
VGA and thus many VGA/SVGA cards do not support it. For this
reason, no modern software uses this interrupt and it can almost
always be safely disabled, if your video card supports it at all.
If your card for some reason CANNOT disable this IRQ (usually there
is a jumper), one solution would be to clip the printed circuit
contact on the board: it's the fourth contact from the left on the
back side. I take no responsibility if you try this.
- Avery's favourite: IRQ2 (actually IRQ9). Watch that VGA, though.
- the memory address: Unlike most cards, ARCnets use "shared memory" for
copying buffers around. Make SURE it doesn't conflict with any other
used memory in your system!
A0000 - VGA graphics memory (ok if you don't have VGA)
B0000 - Monochrome text mode
C0000 \ One of these is your VGA BIOS - usually C0000.
E0000 /
F0000 - System BIOS
Anything less than 0xA0000 is, well, a BAD idea since it isn't above
640k.
- Avery's favourite: 0xD0000
- the station address: Every ARCnet card has its own "unique" network
address from 0 to 255. Unlike Ethernet, you can set this address
yourself with a jumper or switch (or on some cards, with special
software). Since it's only 8 bits, you can only have 254 ARCnet cards
on a network. DON'T use 0 or 255, since these are reserved (although
neat stuff will probably happen if you DO use them). By the way, if you
haven't already guessed, don't set this the same as any other ARCnet on
your network!
- Avery's favourite: 3 and 4. Not that it matters.
- There may be ETS1 and ETS2 settings. These may or may not make a
difference on your card (many manuals call them "reserved"), but are
used to change the delays used when powering up a computer on the
network. This is only necessary when wiring VERY long range ARCnet
networks, on the order of 4km or so; in any case, the only real
requirement here is that all cards on the network with ETS1 and ETS2
jumpers have them in the same position. Chris Hindy <[email protected]>
sent in a chart with actual values for this:
ET1 ET2 Response Time Reconfiguration Time
--- --- ------------- --------------------
open open 74.7us 840us
open closed 283.4us 1680us
closed open 561.8us 1680us
closed closed 1118.6us 1680us
Make sure you set ETS1 and ETS2 to the SAME VALUE for all cards on your
network.
Also, on many cards (not mine, though) there are red and green LED's.
Vojtech Pavlik <[email protected]> tells me this is what they mean:
GREEN RED Status
----- --- ------
OFF OFF Power off
OFF Short flashes Cabling problems (broken cable or not
terminated)
OFF (short) ON Card init
ON ON Normal state - everything OK, nothing
happens
ON Long flashes Data transfer
ON OFF Never happens (maybe when wrong ID)
The following is all the specific information people have sent me about
their own particular ARCnet cards. It is officially a mess, and contains
huge amounts of duplicated information. I have no time to fix it. If you
want to, PLEASE DO! Just send me a 'diff -u' of all your changes.
The model # is listed right above specifics for that card, so you should be
able to use your text viewer's "search" function to find the entry you want.
If you don't KNOW what kind of card you have, try looking through the
various diagrams to see if you can tell.
If your model isn't listed and/or has different settings, PLEASE PLEASE
tell me. I had to figure mine out without the manual, and it WASN'T FUN!
Even if your ARCnet model isn't listed, but has the same jumpers as another
model that is, please e-mail me to say so.
Cards Listed in this file (in this order, mostly):
Manufacturer Model # Bits
------------ ------- ----
SMC PC100 8
SMC PC110 8
SMC PC120 8
SMC PC130 8
SMC PC270E 8
SMC PC500 16
SMC PC500Longboard 16
SMC PC550Longboard 16
SMC PC600 16
SMC PC710 8
SMC? LCS-8830(-T) 8/16
Puredata PDI507 8
CNet Tech CN120-Series 8
CNet Tech CN160-Series 16
Lantech? UM9065L chipset 8
Acer 5210-003 8
Datapoint? LAN-ARC-8 8
Topware TA-ARC/10 8
Thomas-Conrad 500-6242-0097 REV A 8
Waterloo? (C)1985 Waterloo Micro. 8
No Name -- 8/16
No Name Taiwan R.O.C? 8
No Name Model 9058 8
Tiara Tiara Lancard? 8
** SMC = Standard Microsystems Corp.
** CNet Tech = CNet Technology, Inc.
Unclassified Stuff
------------------
- Please send any other information you can find.
- And some other stuff (more info is welcome!):
From: [email protected] (Timo Hilbrink)
To: [email protected] (Avery Pennarun)
Date: Wed, 26 Oct 1994 02:10:32 +0000 (GMT)
Reply-To: [email protected]
[...parts deleted...]
About the jumpers: On my PC130 there is one more jumper, located near the
cable-connector and it's for changing to star or bus topology;
closed: star - open: bus
On the PC500 are some more jumper-pins, one block labeled with RX,PDN,TXI
and another with ALE,LA17,LA18,LA19 these are undocumented..
[...more parts deleted...]
--- CUT ---
** Standard Microsystems Corp (SMC) **
PC100, PC110, PC120, PC130 (8-bit cards)
PC500, PC600 (16-bit cards)
---------------------------------
- mainly from Avery Pennarun <[email protected]>. Values depicted
are from Avery's setup.
- special thanks to Timo Hilbrink <[email protected]> for noting that PC120,
130, 500, and 600 all have the same switches as Avery's PC100.
PC500/600 have several extra, undocumented pins though. (?)
- PC110 settings were verified by Stephen A. Wood <[email protected]>
- Also, the JP- and S-numbers probably don't match your card exactly. Try
to find jumpers/switches with the same number of settings - it's
probably more reliable.
JP5 [|] : : : :
(IRQ Setting) IRQ2 IRQ3 IRQ4 IRQ5 IRQ7
Put exactly one jumper on exactly one set of pins.
1 2 3 4 5 6 7 8 9 10
S1 /----------------------------------\
(I/O and Memory | 1 1 * 0 0 0 0 * 1 1 0 1 |
addresses) \----------------------------------/
|--| |--------| |--------|
(a) (b) (m)
WARNING. It's very important when setting these which way
you're holding the card, and which way you think is '1'!
If you suspect that your settings are not being made
correctly, try reversing the direction or inverting the
switch positions.
a: The first digit of the I/O address.
Setting Value
------- -----
00 0
01 1
10 2
11 3
b: The second digit of the I/O address.
Setting Value
------- -----
0000 0
0001 1
0010 2
... ...
1110 E
1111 F
The I/O address is in the form ab0. For example, if
a is 0x2 and b is 0xE, the address will be 0x2E0.
DO NOT SET THIS LESS THAN 0x200!!!!!
m: The first digit of the memory address.
Setting Value
------- -----
0000 0
0001 1
0010 2
... ...
1110 E
1111 F
The memory address is in the form m0000. For example, if
m is D, the address will be 0xD0000.
DO NOT SET THIS TO C0000, F0000, OR LESS THAN A0000!
1 2 3 4 5 6 7 8
S2 /--------------------------\
(Station Address) | 1 1 0 0 0 0 0 0 |
\--------------------------/
Setting Value
------- -----
00000000 00
10000000 01
01000000 02
...
01111111 FE
11111111 FF
Note that this is binary with the digits reversed!
DO NOT SET THIS TO 0 OR 255 (0xFF)!
*****************************************************************************
** Standard Microsystems Corp (SMC) **
PC130E/PC270E (8-bit cards)
---------------------------
- from Juergen Seifert <[email protected]>
STANDARD MICROSYSTEMS CORPORATION (SMC) ARCNET(R)-PC130E/PC270E
===============================================================
This description has been written by Juergen Seifert <[email protected]>
using information from the following Original SMC Manual
"Configuration Guide for
ARCNET(R)-PC130E/PC270
Network Controller Boards
Pub. # 900.044A
June, 1989"
ARCNET is a registered trademark of the Datapoint Corporation
SMC is a registered trademark of the Standard Microsystems Corporation
The PC130E is an enhanced version of the PC130 board, is equipped with a
standard BNC female connector for connection to RG-62/U coax cable.
Since this board is designed both for point-to-point connection in star
networks and for connection to bus networks, it is downwardly compatible
with all the other standard boards designed for coax networks (that is,
the PC120, PC110 and PC100 star topology boards and the PC220, PC210 and
PC200 bus topology boards).
The PC270E is an enhanced version of the PC260 board, is equipped with two
modular RJ11-type jacks for connection to twisted pair wiring.
It can be used in a star or a daisy-chained network.
8 7 6 5 4 3 2 1
________________________________________________________________
| | S1 | |
| |_________________| |
| Offs|Base |I/O Addr |
| RAM Addr | ___|
| ___ ___ CR3 |___|
| | \/ | CR4 |___|
| | PROM | ___|
| | | N | | 8
| | SOCKET | o | | 7
| |________| d | | 6
| ___________________ e | | 5
| | | A | S | 4
| |oo| EXT2 | | d | 2 | 3
| |oo| EXT1 | SMC | d | | 2
| |oo| ROM | 90C63 | r |___| 1
| |oo| IRQ7 | | |o| _____|
| |oo| IRQ5 | | |o| | J1 |
| |oo| IRQ4 | | STAR |_____|
| |oo| IRQ3 | | | J2 |
| |oo| IRQ2 |___________________| |_____|
|___ ______________|
| |
|_____________________________________________|
Legend:
SMC 90C63 ARCNET Controller / Transceiver /Logic
S1 1-3: I/O Base Address Select
4-6: Memory Base Address Select
7-8: RAM Offset Select
S2 1-8: Node ID Select
EXT Extended Timeout Select
ROM ROM Enable Select
STAR Selected - Star Topology (PC130E only)
Deselected - Bus Topology (PC130E only)
CR3/CR4 Diagnostic LEDs
J1 BNC RG62/U Connector (PC130E only)
J1 6-position Telephone Jack (PC270E only)
J2 6-position Telephone Jack (PC270E only)
Setting one of the switches to Off/Open means "1", On/Closed means "0".
Setting the Node ID
-------------------
The eight switches in group S2 are used to set the node ID.
These switches work in a way similar to the PC100-series cards; see that
entry for more information.
Setting the I/O Base Address
----------------------------
The first three switches in switch group S1 are used to select one
of eight possible I/O Base addresses using the following table
Switch | Hex I/O
1 2 3 | Address
-------|--------
0 0 0 | 260
0 0 1 | 290
0 1 0 | 2E0 (Manufacturer's default)
0 1 1 | 2F0
1 0 0 | 300
1 0 1 | 350
1 1 0 | 380
1 1 1 | 3E0
Setting the Base Memory (RAM) buffer Address
--------------------------------------------
The memory buffer requires 2K of a 16K block of RAM. The base of this
16K block can be located in any of eight positions.
Switches 4-6 of switch group S1 select the Base of the 16K block.
Within that 16K address space, the buffer may be assigned any one of four
positions, determined by the offset, switches 7 and 8 of group S1.
Switch | Hex RAM | Hex ROM
4 5 6 7 8 | Address | Address *)
-----------|---------|-----------
0 0 0 0 0 | C0000 | C2000
0 0 0 0 1 | C0800 | C2000
0 0 0 1 0 | C1000 | C2000
0 0 0 1 1 | C1800 | C2000
| |
0 0 1 0 0 | C4000 | C6000
0 0 1 0 1 | C4800 | C6000
0 0 1 1 0 | C5000 | C6000
0 0 1 1 1 | C5800 | C6000
| |
0 1 0 0 0 | CC000 | CE000
0 1 0 0 1 | CC800 | CE000
0 1 0 1 0 | CD000 | CE000
0 1 0 1 1 | CD800 | CE000
| |
0 1 1 0 0 | D0000 | D2000 (Manufacturer's default)
0 1 1 0 1 | D0800 | D2000
0 1 1 1 0 | D1000 | D2000
0 1 1 1 1 | D1800 | D2000
| |
1 0 0 0 0 | D4000 | D6000
1 0 0 0 1 | D4800 | D6000
1 0 0 1 0 | D5000 | D6000
1 0 0 1 1 | D5800 | D6000
| |
1 0 1 0 0 | D8000 | DA000
1 0 1 0 1 | D8800 | DA000
1 0 1 1 0 | D9000 | DA000
1 0 1 1 1 | D9800 | DA000
| |
1 1 0 0 0 | DC000 | DE000
1 1 0 0 1 | DC800 | DE000
1 1 0 1 0 | DD000 | DE000
1 1 0 1 1 | DD800 | DE000
| |
1 1 1 0 0 | E0000 | E2000
1 1 1 0 1 | E0800 | E2000
1 1 1 1 0 | E1000 | E2000
1 1 1 1 1 | E1800 | E2000
*) To enable the 8K Boot PROM install the jumper ROM.
The default is jumper ROM not installed.
Setting the Timeouts and Interrupt
----------------------------------
The jumpers labeled EXT1 and EXT2 are used to determine the timeout
parameters. These two jumpers are normally left open.
To select a hardware interrupt level set one (only one!) of the jumpers
IRQ2, IRQ3, IRQ4, IRQ5, IRQ7. The Manufacturer's default is IRQ2.
Configuring the PC130E for Star or Bus Topology
-----------------------------------------------
The single jumper labeled STAR is used to configure the PC130E board for
star or bus topology.
When the jumper is installed, the board may be used in a star network, when
it is removed, the board can be used in a bus topology.
Diagnostic LEDs
---------------
Two diagnostic LEDs are visible on the rear bracket of the board.
The green LED monitors the network activity: the red one shows the
board activity:
Green | Status Red | Status
-------|------------------- ---------|-------------------
on | normal activity flash/on | data transfer
blink | reconfiguration off | no data transfer;
off | defective board or | incorrect memory or
| node ID is zero | I/O address
*****************************************************************************
** Standard Microsystems Corp (SMC) **
PC500/PC550 Longboard (16-bit cards)
-------------------------------------
- from Juergen Seifert <[email protected]>
STANDARD MICROSYSTEMS CORPORATION (SMC) ARCNET-PC500/PC550 Long Board
=====================================================================
Note: There is another Version of the PC500 called Short Version, which
is different in hard- and software! The most important differences
are:
- The long board has no Shared memory.
- On the long board the selection of the interrupt is done by binary
coded switch, on the short board directly by jumper.
[Avery's note: pay special attention to that: the long board HAS NO SHARED
MEMORY. This means the current Linux-ARCnet driver can't use these cards.
I have obtained a PC500Longboard and will be doing some experiments on it in
the future, but don't hold your breath. Thanks again to Juergen Seifert for
his advice about this!]
This description has been written by Juergen Seifert <[email protected]>
using information from the following Original SMC Manual
"Configuration Guide for
SMC ARCNET-PC500/PC550
Series Network Controller Boards
Pub. # 900.033 Rev. A
November, 1989"
ARCNET is a registered trademark of the Datapoint Corporation
SMC is a registered trademark of the Standard Microsystems Corporation
The PC500 is equipped with a standard BNC female connector for connection
to RG-62/U coax cable.
The board is designed both for point-to-point connection in star networks
and for connection to bus networks.
The PC550 is equipped with two modular RJ11-type jacks for connection
to twisted pair wiring.
It can be used in a star or a daisy-chained (BUS) network.
1
0 9 8 7 6 5 4 3 2 1 6 5 4 3 2 1
____________________________________________________________________
< | SW1 | | SW2 | |
> |_____________________| |_____________| |
< IRQ |I/O Addr |
> ___|
< CR4 |___|
> CR3 |___|
< ___|
> N | | 8
< o | | 7
> d | S | 6
< e | W | 5
> A | 3 | 4
< d | | 3
> d | | 2
< r |___| 1
> |o| _____|
< |o| | J1 |
> 3 1 JP6 |_____|
< |o|o| JP2 | J2 |
> |o|o| |_____|
< 4 2__ ______________|
> | | |
<____| |_____________________________________________|
Legend:
SW1 1-6: I/O Base Address Select
7-10: Interrupt Select
SW2 1-6: Reserved for Future Use
SW3 1-8: Node ID Select
JP2 1-4: Extended Timeout Select
JP6 Selected - Star Topology (PC500 only)
Deselected - Bus Topology (PC500 only)
CR3 Green Monitors Network Activity
CR4 Red Monitors Board Activity
J1 BNC RG62/U Connector (PC500 only)
J1 6-position Telephone Jack (PC550 only)
J2 6-position Telephone Jack (PC550 only)
Setting one of the switches to Off/Open means "1", On/Closed means "0".
Setting the Node ID
-------------------
The eight switches in group SW3 are used to set the node ID. Each node
attached to the network must have an unique node ID which must be
different from 0.
Switch 1 serves as the least significant bit (LSB).
The node ID is the sum of the values of all switches set to "1"
These values are:
Switch | Value
-------|-------
1 | 1
2 | 2
3 | 4
4 | 8
5 | 16
6 | 32
7 | 64
8 | 128
Some Examples:
Switch | Hex | Decimal
8 7 6 5 4 3 2 1 | Node ID | Node ID
----------------|---------|---------
0 0 0 0 0 0 0 0 | not allowed
0 0 0 0 0 0 0 1 | 1 | 1
0 0 0 0 0 0 1 0 | 2 | 2
0 0 0 0 0 0 1 1 | 3 | 3
. . . | |
0 1 0 1 0 1 0 1 | 55 | 85
. . . | |
1 0 1 0 1 0 1 0 | AA | 170
. . . | |
1 1 1 1 1 1 0 1 | FD | 253
1 1 1 1 1 1 1 0 | FE | 254
1 1 1 1 1 1 1 1 | FF | 255
Setting the I/O Base Address
----------------------------
The first six switches in switch group SW1 are used to select one
of 32 possible I/O Base addresses using the following table
Switch | Hex I/O
6 5 4 3 2 1 | Address
-------------|--------
0 1 0 0 0 0 | 200
0 1 0 0 0 1 | 210
0 1 0 0 1 0 | 220
0 1 0 0 1 1 | 230
0 1 0 1 0 0 | 240
0 1 0 1 0 1 | 250
0 1 0 1 1 0 | 260
0 1 0 1 1 1 | 270
0 1 1 0 0 0 | 280
0 1 1 0 0 1 | 290
0 1 1 0 1 0 | 2A0
0 1 1 0 1 1 | 2B0
0 1 1 1 0 0 | 2C0
0 1 1 1 0 1 | 2D0
0 1 1 1 1 0 | 2E0 (Manufacturer's default)
0 1 1 1 1 1 | 2F0
1 1 0 0 0 0 | 300
1 1 0 0 0 1 | 310
1 1 0 0 1 0 | 320
1 1 0 0 1 1 | 330
1 1 0 1 0 0 | 340
1 1 0 1 0 1 | 350
1 1 0 1 1 0 | 360
1 1 0 1 1 1 | 370
1 1 1 0 0 0 | 380
1 1 1 0 0 1 | 390
1 1 1 0 1 0 | 3A0
1 1 1 0 1 1 | 3B0
1 1 1 1 0 0 | 3C0
1 1 1 1 0 1 | 3D0
1 1 1 1 1 0 | 3E0
1 1 1 1 1 1 | 3F0
Setting the Interrupt
---------------------
Switches seven through ten of switch group SW1 are used to select the
interrupt level. The interrupt level is binary coded, so selections
from 0 to 15 would be possible, but only the following eight values will
be supported: 3, 4, 5, 7, 9, 10, 11, 12.
Switch | IRQ
10 9 8 7 |
---------|--------
0 0 1 1 | 3
0 1 0 0 | 4
0 1 0 1 | 5
0 1 1 1 | 7
1 0 0 1 | 9 (=2) (default)
1 0 1 0 | 10
1 0 1 1 | 11
1 1 0 0 | 12
Setting the Timeouts
--------------------
The two jumpers JP2 (1-4) are used to determine the timeout parameters.
These two jumpers are normally left open.
Refer to the COM9026 Data Sheet for alternate configurations.
Configuring the PC500 for Star or Bus Topology
----------------------------------------------
The single jumper labeled JP6 is used to configure the PC500 board for
star or bus topology.
When the jumper is installed, the board may be used in a star network, when
it is removed, the board can be used in a bus topology.
Diagnostic LEDs
---------------
Two diagnostic LEDs are visible on the rear bracket of the board.
The green LED monitors the network activity: the red one shows the
board activity:
Green | Status Red | Status
-------|------------------- ---------|-------------------
on | normal activity flash/on | data transfer
blink | reconfiguration off | no data transfer;
off | defective board or | incorrect memory or
| node ID is zero | I/O address
*****************************************************************************
** SMC **
PC710 (8-bit card)
------------------
- from J.S. van Oosten <[email protected]>
Note: this data is gathered by experimenting and looking at info of other
cards. However, I'm sure I got 99% of the settings right.
The SMC710 card resembles the PC270 card, but is much more basic (i.e. no
LEDs, RJ11 jacks, etc.) and 8 bit. Here's a little drawing:
_______________________________________
| +---------+ +---------+ |____
| | S2 | | S1 | |
| +---------+ +---------+ |
| |
| +===+ __ |
| | R | | | X-tal ###___
| | O | |__| ####__'|
| | M | || ###
| +===+ |
| |
| .. JP1 +----------+ |
| .. | big chip | |
| .. | 90C63 | |
| .. | | |
| .. +----------+ |
------- -----------
|||||||||||||||||||||
The row of jumpers at JP1 actually consists of 8 jumpers, (sometimes
labelled) the same as on the PC270, from top to bottom: EXT2, EXT1, ROM,
IRQ7, IRQ5, IRQ4, IRQ3, IRQ2 (gee, wonder what they would do? :-) )
S1 and S2 perform the same function as on the PC270, only their numbers
are swapped (S1 is the nodeaddress, S2 sets IO- and RAM-address).
I know it works when connected to a PC110 type ARCnet board.
*****************************************************************************
** Possibly SMC **
LCS-8830(-T) (8 and 16-bit cards)
---------------------------------