Elektor magazine published a design (alas without the
source
code to the
firmware) for an audio-bandwidth digial storage 'scope card for the
Gameboy. No, I am not joking...
I don't recall seeing the original Elektor article, but
I have seen adverts in various UK electronics mags for
said GB addon (about ?90 IIRC).
Elektor do have some useful projects every now and then :-)
Antonio
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Antonio Carlini arcarlini(a)iee.org