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- Path: sparky!uunet!cs.utexas.edu!torn!watserv2.uwaterloo.ca!watmath!undergrad.math.waterloo.edu!cayley.uwaterloo.ca!rbairos
- From: rbairos@cayley.uwaterloo.ca (Rob Bairos)
- Subject: Null Modem Cable Dilusion Confusion
- Message-ID: <C07CMt.5n9@undergrad.math.waterloo.edu>
- Sender: news@undergrad.math.waterloo.edu
- Organization: University of Waterloo
- Date: Sat, 2 Jan 1993 01:11:16 GMT
- Lines: 42
-
-
- Hi, a couple of days ago, I posted my problem concerning file transfers
- between my two PC's. The following is the solution and my experiences
- if anyone's who's interested. Thanks for the responses!
-
- After fiddling with mismatching connections for a couple of hours,
- I salvaged two joystick cords from my old colecovision and gemini,
- (these contain at least 8/9 possible wires in them). I used the
- Radio Shack null modem adapter as a guide. The two cords were
- connected on a one to one basis except for the following:
-
-
- pins 2 and 3 were cross-connected.
- pin 4 on one was connected to (6 *and* 8) on the other, (& vice versa)
- pins 5 were connected.
- pins 1 7 and 9 were left unnconnected.
- Pin 7 is supposed to be signal ground, so to compensate I clipped
- a jumper from one metal chasis to the other.
-
- After several scotch-tape pieces later, I plugged them into the
- 9-pin ports where the mice usually fit in.
-
- I used PCplus and was about to give up cuz I almost didn't notice what
- I typed on one keyboard showed up on the other screen. I set it to
- max baud rate, threw in an extra stop bit (figured it would be more
- stable) and disabled all carrier-detect options. (don't know why
- carrier detect wasn't detecting). Anyways, it worked beautifully*.
-
- *Well, until I disabled disk-caching software and *disabled* turbo
- speed on the one PC, the max average cps was about 2700 using ZModem.
- After I got it up to 9900 - 10,000cps with strange 10sec+ pauses
- appearing spurratically.
-
- That's my story. There's better software out there for the actual
- transfer. I had to keep shelling-out, and creating new directories
- manually.
-
- One small strike against the RS-232 conspiracy!
-
-
- Rob Bairos
-
-