clarke@husc4.HARVARD.EDU (Cam Clarke) (12/28/87)
Does anyone have information about how to build AppleTalk-type connectors?
I would like to connect my mac, my roommates mac, and our 1 Imagewriter II
together, but spending $30 per connector (the best price I've found for
EasyNet via mailorder) is a bit steep for some phone cable. I've heard
vaguely that there is something like a resistor in the little boxes on
an AppleTalk net but does anyone have enough specifics to build the little
buggers? Was it in a Tech Note that I could grab from Sumex? Any help or
pointers would be appreciated.
-Cam Clarke
clarke%husc4@harvard.ARPA clarke@husc4.harvard.edu
clarke@husc4.UUCP clarke@HARVUNXU.BITNET
...{seismo, harpo, ihnp4, linus, allegra, ut-sally}!harvard!husc4!clarke
-Cam Clarke
clarke%husc4@harvard.ARPA clarke@husc4.harvard.edu
clarke@husc4.UUCP clarke@HARVUNXU.BITNET
..{seismo, harpo, ihnp4, linus, allegra, ut-sally}!harvard!husc4!clarkehovan@bgsuvax.UUCP (John Hovan) (01/12/88)
Does anyone know what makes appletalk connectors special? A few
readings with an ohmmeter showed that the connectors are not merely a straight
though cable. One possible explanation is that the box supplied with
appletalk has an optically isolated circuit inside its 2" x 1" mysterious
box. Has anyuone been brave enough to open one of these boxes and solve the
mystery??? If you have, please let me know! They cannot be complex since
the appletalk hardware only uses 3 wires from the computers subminature
din-8 jack.
John Hovan
Bowling Green State University
Hardware Support
hovan@bgsuvax.uucp
N8JAAmatt@shorty.CS.WISC.EDU (Matt Schaefer) (01/18/88)
In article <1498@bgsuvax.UUCP> hovan@bgsuvax.UUCP (John Hovan) writes: > Does anyone know what makes appletalk connectors special? A few >readings with an ohmmeter showed that the connectors are not merely a straight >though cable. I remember seeing schematics in a very recent issue of Computer Shopper of the innards of Appletalk cables. It was definitely not a straight-through cable. There was also a schematic of how to make a "cheater" cord if you only wanted to connect two devices together. I'll have to wait until I get home to check which issue. Matt Schaefer ...!{harvard,ihnp4,rutgers,ucbvax}!uwvax!matt UW-Madison Computer Sciences Laboratory matt@cs.wisc.edu
ephraim@think.COM (ephraim vishniac) (01/21/88)
In article <1498@bgsuvax.UUCP> hovan@bgsuvax.UUCP (John Hovan) writes: > Does anyone know what makes appletalk connectors special? A few >readings with an ohmmeter showed that the connectors are not merely a straight >though cable. One possible explanation is that the box supplied with >appletalk has an optically isolated circuit inside its 2" x 1" mysterious >box. Has anyuone been brave enough to open one of these boxes and solve the >mystery??? If you have, please let me know! They cannot be complex since >the appletalk hardware only uses 3 wires from the computers subminature >din-8 jack. I opened up an AppleTalk connector last year, and found an isolation transformer and a trivial amount of wiring. The connector box is glued shut, but it's possible to open it without damaging the contents by prying carefully all the way around the seam. You'll undoubtedly inflict some cosmetic damage, but not very much if you're careful. BTW, bgsuvax complains that "hovan" is an unknown user! Ephraim Vishniac ephraim@think.com Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214