[PD-ot] RS232 sound card?

[Mathieu Bouchard]

On Wed, 16 Apr 2008, Hans-Christoph Steiner wrote:

> Has anyone ever seen an RS232 sound card?  I am looking for a sound card 
> to hook up to old wifi routers.  They will run Pd, and have serial ports 
> built-in, so it would be awesome to be able to hook up a serial sound 
> card to them.  It is possible to add USB to many wifi routers, but it is 
> a lot more work.

There was software called MODPLAY for DOS, which included a plan for a DIY 
parallel port soundcard running at 9.6 kHz, 8 bit, as this type of 
soundcard was directly supported by that software. It uses only resistors, 
as a kind of DIY DAC chip. It's better to use an actual DAC chip, unless 
your resistors are very precise.

It could be adapted for serial port if you have a RS232 deserialiser chip 
with enough bits in it. I don't know what name you will find it under. 
It's also possible that you have to use a combination of two chips for 
that, e.g. a RS232 chip with a separate deserialiser. I don't know what's 
the real name for a deserialiser. If you can't find one, you need in turn 
to make it combining a mux and a 8-bit memory.

Alternately, a PIC can function as a soundcard. This is probably easier 
for anyone who is more into software than into electronics.

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal QC Canada