Re: modem/300 (fwd)

From: Andre Fachat (
Date: 1999-02-12 14:16:45

Marko Mäkelä wrote:
> Does someone here know the Commodore 1660 modem?  I don't have any
> experience in using modems with C= equipment.

Me neither, but...
> My question is can this "audio" input be used somehow like a soundcard?
> Because essentially a MODEM is a MOdulator/DEModulator, i.e. a D/A/A/D
> convertor...  I would be connecting it to a first generation VIC-20.

It is not exactly a D/A/A/D converter. Because the 300 baud modem
uses only two frequencies (one to indicate a 0-bit and one for a 1-bit)

a) only has two filters that detect the presence of one of the two
   frequencies (+/- filter width) on the receiving side.
   The result is signaled to the computer as one bit - on or off.

b) only has two frequency generators, one for each of the two
   used frequencies. The computer switches the frequency by one
   output bit.

So I guess using it as a soundcard is bit off in this case...


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Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG
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