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Article #6253

Null Modem Cable Dilusion Confusion

#6253
From: Rob Bairos
Date: Sat, 02 Jan 1993 01:11
41 lines
2211 bytes
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
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Newsgroups: comp.os.msdos.programmer,comp.sys.ibm.pc.hardware
Path: arc1-ca.pugleaf.net!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