On Mon, 30 Aug 2004 17:53:08 -0700 Ron Hudson
<ron.hudson(a)sbcglobal.net> asked:
>
> Anyone know how these are wired inside? could I make a dedicated 3 node
> "wire" out of just
> wire and connectors? perhaps an odd resistor or two?
First some definitions: Appletalk is the protocol that Apple used for
connecting to printers and other computers. Localtalk is the hardware
specification. Looking around for the latter will give you a lot more
information.
The problem Apple (and others) solved is how to connect multiple RS232
(RS422) devices together without blowing everything to bits. Their
solution was to use a transformer with two independent windings on the
primary and one on the secondary (along with a few resistors). The
secondary windings are paralleled among the various devices. The
primaries are connected to the Tx and Rx of the RS232. This makes for a
simple two-wire network. Normally, the ends of the secondary bus are
terminated in 110 Ohm resistors.
Apple's implementation used proprietary cables. Third party boxes
(Farallon, etc.) used RS11 phone cables. I've seen these boxes at
various charity outlets in the recent past going for next to nothing.
If you have an old phone modem laying around (parts - not
collectable...) you can use the output coupling transformer to make an
adaptor. They generally have the two-primary/one-secondary format and
have the correct ratio. The receiver side of the primary should be
terminated with a couple hundred Ohm resistor.
As a side note, there are a lot of Localtalk printers and the like
showing up for cheap. Connection to Windoze and Linux boxes are
generally a problem. There are cards that talk Appletalk, but they are
fairly scarce. However, there are a number of bridges coming available
that connect ethernet to Localtalk and the Appletalk drivers are
available for both OSs.
CRC
I'd say that it's not working. The random display does suggest that a lot
of the video card is functional. However, it also suggests that the ROM
monitor on the CPU card isn't being run, which would clear the screen. This
could suggest bad memory or CPU or both, but in any case I'd say that,
contrary to what the seller says, the system is not functioning properly.
I have a working bruker aspect 3000 and the disc drive, is there any buyers
you might know of for these items?
Barry Lane - Audio Visual Services
Saskatchewan Agriculture, Food and Rural Revitalization
Room B5, 3085 Albert St.
Regina, Saskatchewan, CANADA
S4S 0B1
(306) 787-5158
FAX 787-0216<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" />
<http://www.wideopenfuture.ca/>
Thanks to all that responded. I couldn't cover everyone, so if I missed
you, or you were beaten to the punch, sorry.
The winners have been notified. Guys, remember if you Paypal, do not use
this osfn email address for my account, but the bestweb one.
Thanks all!
William Donzelli
aw288(a)osfn.org
>One of my customers has a box full of those lil thingers... small
>(matchbox-like) boxes, right? If anyone wants em, that could
>probably be arranged :)
Yup, they are about the size of a fat matchbox, with a tail on one end
and two RJ-12's on the other. The LocalTalk version is a little thinner,
and has two mini-din 3 jacks instead of RJ-12 jacks.
I see them all the time on the LEM Swap list for darn near free.
-chris
<http://www.mythtech.net>
On Aug 30 2004, 18:33, Vintage Computer Festival wrote:
> On Mon, 30 Aug 2004, Peter C. Wallace wrote:
>
> > PC pine works fine,
>
> No it doesn't:
>
> Command Line Arguments
>
> Pine
>
> ...
>
> < file
> Pine will startup in the composer with file read into the body of the
> message. Once the message is sent, the Pine session closes.
> I don't want to go into the composer. I want it to just send the
damn
> message I specify to the address I tell it to!
Can't you just wrap the invocation of pine and the key sequence to send
the message in a 2- or 3-line DOS batch file?
--
Pete Peter Turnbull
Network Manager
University of York
>Anyone know how these are wired inside? could I make a dedicated 3 node
>"wire" out of just
>wire and connectors? perhaps an odd resistor or two?
There is some small degree of electronics.
I know there are plans online for building one from scratch, but you can
probably find some phonenet connectors for dirt cheap (or even free... I
had a case load and would have happily given you some, but I gave the
entire case to Tom Owad on this list last year... you can ask him if
there are some left he isn't using).
-chris
<http://www.mythtech.net>
I was contacted by a gentleman in the UK who has two PDP-11/53 systems that
control a "printing press management information system". They are currently
not working. He is looking for someone to repair, and possibly support them
for a couple of years.
If anyone is interested, contact me off-list.
Regards,
Jay West
---
[This E-mail scanned for viruses by Declude Virus]
On Aug 30 2004, 17:53, Ron Hudson wrote:
>
> Anyone know how these are wired inside? could I make a dedicated 3
node
> "wire" out of just
> wire and connectors? perhaps an odd resistor or two?
I've never had a real Farallon PhoneTalk unit so I don't know, but I
suspect it has some real electronics inside, or a hybrid transformer
like LocalTalk boxes. However, if you're starting from scratch, you
might look at the CapNet subsitute. The first link Google finds for
"capnet localtalk" will find a copy of the document I originally saw
several years ago, at http://www.jagshouse.com/localtalk.html
--
Pete Peter Turnbull
Network Manager
University of York
