TW> Actualy becasue of the Length Limits on serial communications
TW> cables didn't most of those old nets use Current Loops?

RJT> Not that I'm aware of.

RJT> Back in those days you always had lots of options,  the interface could ha
RJT> been RS-232 as well,  hardware or software handshaking,  etc.

RJT> There really isn't that much of a length limitation on serial lines,  it
RJT> depends on a few things,  mostly whether or not you're running shielded wi
RJT> and most importantly,  at what baud rate you want to run.  The above-menti
RJT> printer ran at 300 baud,  which was fine because it was rated at 30 cps an
RJT>  so a faster rate wouldn't have made anything better.  I know that when yo
RJT> up around 9600 and higher speeds cabling gets more critical and allowable
RJT> length gets way shorter.

 If you go RS-485 you can go thousands of feet
at 9600 baud. We're doing it.

 TTYL.

 Robert

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