How about a CPLD-based custom MMU that interfaces between the ISA bus, your
memory and a VS1001/VS1011? you could memory-map all the configuration
registers of the MP3 chip and convert the incoming data in that region to SPI
on the fly. The VS1001 asserts a pin when it needs data so you can just listen
to that and bit-bang serial data to it when necessary. That chip also has a
built-in op-amp, so your circuit could be fairly simple.
- Marcel

CSB <csb_cbw@fastmail.fm> wrote:

> >
> >
> 
> I did consider getting a standalone mp3 player, but this wouldn't be
> much of a project.
> 
> As for a special sound card, I wouldn't refuse one, but again, where's
> the fun?
> 
> I perhaps should have specified that I am looking for a hobby project.
> I searched some more today, and still, it seems nobody has had a need
> (or an interest) for this kind of thing!
> 
> Thanks for the replies,
> Christian



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