Glenn Johansson wrote:
>
> >I've seen a California-designed house alarm with a built-in
> >modem/communicator. On closer inspection (opening the damn thing) it
> >turned out to be a 16MHz 16C74 doing to whole lot. Quite impressive.
>
> But did it emulate an actual modem or just a DTMF-sender? An alarm just needs
 to send the touch-tone frequencies as far as I can understand, plus perhaps a
 digit or two to inform about the alarm type. Unless it's going to broadcast
 live via an onboard  camera and microphone.
>

I'm not sure. I didn't have it long enough to test all the goodies. :(

> The day someone writes PIC code to emulate a 300 bps or even an 1200 bps
 bidirectonal modem, and distribute the code public domain, THEN I will be
 impressed. ;-)

Wait for that 50 MIPS Scenix chip. You'd be able to stir you a Martini
and communicate at a few thousand baud...

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za
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