1964 Antique MODEM Live Demo
mcguire at neurotica.com
Sun May 31 12:08:49 CDT 2009
On May 30, 2009, at 6:46 PM, Chris Elmquist wrote:
>> So, you can't see a possible set of circumstances where having the
>> voltage coming in the serial port could cause the frequency shift
>> to be
>> How clever do you think the tone generator side is?
> Well, as Tony replied-- I think that the RS232 input is a logic level.
> It's not an analog level. So, you are going to get either the mark
> or the space tone and not something in between.
> I think this situation was just a poor explaination of what went
> Whatever miscable situation he had caused him to generate the opposite
> tone of what he was expecting but not a tone that was off frequency
> one of the two possibilities.
Was it in fact the opposite tones (i.e., mark/space reversed) or
could it have been an originate mode vs. answer mode issue? Many
(most?) modems could be switched between the two sets of tones.
Port Charlotte, FL
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