> Yes, but like all laptops more than 6 months old, the battery no longer
> functions.

You could always get a new battery. If it's a fairly common model 
there's normally non-OEM ones available quite cheaply.

> I'm pretty sure the Raspberry Pi *hardware* can do this, but again I'm
> unsure about software. (Although since it's basically running Debian, it
> seems reasonable that it might work.)

Well if it's a USB interface then the Pi definitely has a working USB 
port :-)

Raspbian can definitely talk to a USB DAC for *playing* audio. But lsat 
time I checked the drivers were a bit buggy and you got random 
split-seconds of white noise every 30 seconds or so, and switching to 
different sample rates sometimes completely crashed the sound system and 
hung whatever app you were running. I ended up going back to the 
analogue audio output. But it might be fixed by now, or just my DAC was 
strage, IDK.

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