Software & docs for Shiva Fastpath 4 box

From: Carlos Murillo <carlos_murillo_at_epm.net.co>
Date: Thu Sep 12 13:58:01 2002

At 09:51 AM 9/12/02 -0700, you wrote:
>> That would be the trickiest part... I think that I should
>> try wiring the DE9 directly to a 4wire phone cable; it is easier
>> to find a phone cable than a female DIN8.
>
>That won't work. The LocalTalk/PhoneNet adapters are not passthrus.
>Apple LocalTalk adapters contain self-terminating connectors (the
>plastic pip in the end of the cable pushes on a switch that disengages
>the internal terminator; PhoneNet adapters use RJ-11s with
>external terminators), and both adapters contain at least a transformer,
>IIRC to couple the Mac to the network. There might also be a resistor
>or two in the adapter. I haven't opened up one in over 10 years.
>If you have a spare adapter you wish to sacrifice, you could cut the
>DIN-8 off and install a DE-9 instead. If you had enough cable, you
>could take the DIN-8 pigtail and put a matching DE-9 on _that_ so you
>could recombine the two pieces if you needed it for its original use.

Guys, after all of your comments, I had no choice but to crack
open a Farallon adapter. Indeed, there is a pulse isolation transformer
inside, Farallon part no. HK 9418K. I think that the transformer is wired
up to cancel local listening (as in phones). Makes sense so that you can
detect collisions.

So, can I now go and assume that the DE9 in the Shiva Fastpath has the
same pinout as the older serial connectors in the original mac and the
Mac512K?

regards,

carlos.

--------------------------------------------------------------
Carlos E. Murillo-Sanchez carlos_murillo_at_nospammers.ieee.org
Received on Thu Sep 12 2002 - 13:58:01 BST