12 Sep
2002
12 Sep
'02
6:58 a.m.
At 09:51 AM 9/12/02 -0700, you wrote:
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(a)nospammers.ieee.org
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.