Path: utzoo!utgpu!water!watmath!clyde!rutgers!sri-spam!ames!pasteur!agate!ig!uwmcsd1!marque!gryphon!pnet02!bilbo
From: bilbo@pnet02.cts.com (Bill Daggett)
Newsgroups: comp.dcom.modems
Subject: Re: IBM-C128 hookup
Message-ID: <2568@gryphon.CTS.COM>
Date: 16 Feb 88 06:00:22 GMT
Sender: root@gryphon.CTS.COM
Organization: People-Net [pnet02], Redondo Beach, CA.
Lines: 23

A null modem I believe is in reference to a direct cable hook-up between two
computers and that physically there is no modem.  The null modem cable carries
the same essential data lines that a RS232 cable carries from your computer to
the modem with the same pinout but one important exception:  To work as a
"null" modem cable the send and receive wires are crossed.  In other words,
send and receive data at one plug goes to the receive and send data
respectively at the other plug.  From what I hear you can tie just about any
two computers together this way.
 
BTW, when I was transfering some old Apple files to the Amiga I experienced
great difficulty too and not with getting the computers to talk to each other
but in the file data format.  There was a hi bit / lo bit problem with the
Apple.  It seems that Apple DOS 3.3 set the hi bit or didn't - I don't
remember which and that ProDOS did the opposite.  I would send the file to the
Amiga and when I took a look at it it would be total garbage - the alternate
character set.  I transfered the files on the Apple from DOS 3.3 to ProDOS or
vic versa - you get the idea?  And sent the file again to the Amiga and
hooray!  It was readable.
 
Bill

UUCP: {ihnp4!scgvaxd!cadovax rutgers!marque}!gryphon!pnet02!bilbo
INET: bilbo@pnet02.cts.com