Apple II Cassette Drive App?

[Reasons.]

So there's been a lot of talk of 3.5 mm jacks today, and I had an idea. Storage on an Apple II is kind of hard, considering that the physical media (floppies and cassette drives) is increasingly out of production. Floppy emulation works but costs a not-insignificant amount of money. Has anyone ever looked into the feasibility of writing a program to use the standard audio input/output on a modern computer to emulate an Apple II cassette drive? The cassette interface isn't the best way of doing storage, but for the low low price of free I don't imagine there'd be many complaints. Is this a tragic misunderstanding of the technology, or is this something that's doable?

 

[Paralel]

Its been done. An Apple II cassette emulation program has been around for awhile.

 

[Gorgonops]

Note that "cassette emulation" can be as simple as recording and playing back .wav files. "Apps" for that go back a ways. Like 30 years. (Although I suppose when you factor in the cost of storage and the resolution of widely available audio hardware I should probably bump that to more like 20 years.)

 

[rsolberg]

I've been pondering this for a while. It seems to me a smartphone, tablet, or iPod Touch would be ideal with a custom audio cable.

 

[fimbulvetr]

You can even use the online Apple ][ Game Server to stream right to your Apple ][

http://asciiexpress.net/gameserver/