Re: Commodore Modems - C1660 and C1670

From: Marko Mäkelä (
Date: 2004-01-30 13:52:24

On Fri, Jan 30, 2004 at 01:12:05PM +0100, Groepaz wrote:
> > Exactly!  It doesn't "put out" any voltage -- it works with what's on the
> > line.
> hehe yeah just imagine a circuit with 1000000 independent power sources
> connected to it.... that'll work great :o) NOT!

A semiconductor or an inductive or capacitive load can be viewed as a
voltage source.  Maybe Mr. Levak was referring on that?

Has anyone measured the voltage when doing pulse dialing?  I think that there
can be high spikes.  In the early 1990s, when I used a 2400 bps modem
(the only modem I have ever owned and still own), I remember seeing garbage
on the screen that could have been caused by a neighbour calling with pulse
dialing.  I also remember hearing dial pulses when talking on the phone.
Back then, the phone exchange didn't understand touch tone dialing (or it did,
but it apparently internally converted DTMF to dial pulses, because DTMF
calls were actually slower to connect than pulse dialed calls).


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