1964 Antique MODEM Live Demo

[Gordon JC Pearce]

On Fri, 2009-05-29 at 07:34 -0500, Chris Elmquist wrote:
> On Thursday (05/28/2009 at 04:03PM -0700), Brent Hilpert wrote:
> > 
> > (pedantic: His technical description was a little off, it's FSK, not an
> > 'interrupted' tone.)
> 
> Agreed.  He started to get on track but then fell off again when he started
> saying the tones were a function of the voltage level coming in on the
> RS232 port and that because his laptop had too low of a voltage on that
> port, he was getting the wrong tones.  This whole discussion in the context
> of the modem being analog-- implying that he was getting tones that were
> off frequency due to the incorrect voltage level.  I don't think it went
> quite like that.

So, you can't see a possible set of circumstances where having the wrong
voltage coming in the serial port could cause the frequency shift to be
wrong?

How clever do you think the tone generator side is?

Gordon