Hi-
They go up to 256k.  32 and 64k versions are cheap. The 25LC640-I/SN-ND at Digikey is
$1.59CN ($1US).  I expect this will progress over the next year.

I haven't gotten to the sound stuff (yet)!

David

Roman Black wrote:

> David Harris wrote:
> >
> > I'm interested in sound for model trains -- your stuff is just the ticket -- I had
> > thought of similar, but folding the filter into the calculation is brilliant!
> > David
>
> Thanks! Sounds like a perfect app for one-PIC
> sound playback. Choo choo! :o)
>
> I'd like to hear any feedback you have on using
> my PIC sound stuff, if you use it that is. Using
> a SPI eeprom will work well, but aren't they only
> 8kbyte?? Maybe it's better to use a 8kword PIC like
> a 16F876, with the data stored as 14bits instead of
> 8. I think Scott D. mentioned this idea recently.
> With about 7500 words, at 14bits is 13125 BYTES
> of storage and all in one PIC. Just a thought.
>
> I'd be happy to put up any of your work on the
> PIC sound encoder webpage:
> http://centauri.ezy.net.au/~fastvid/picsound.htm
> -Roman
>
> > > David Harris wrote:
> > > >
> > > > Hi Roman -
> > > > Great site, great implementation.  What do you think of my idea of using a SPI
> > > > serial eeprom?  You can set up an address, and then just clock the eeprom (with
> > > > PWM) and feed the output to the RC filter.
> > > > David
> > >
> > > Hi David, I didn't think of that. I currently
> > > use I2C eeprom in another project but of course
> > > that needs an ack bit after every 8 data bits.
> > > So the SPI doesn't need an ack? I'll have to get
> > > a SPI eeprom datasheet and have a look. don't
> > > they still have to stop and wait for the write
> > > cycle at some point? At 15625Hz the 5mS write
> > > delay is only 78 bits, less than 10 bytes. So it
> > > wouldn't be hard to do recording too with the
> > > eeprom with a 16 or 32byte buffer.
> > > -Roman
>
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