[sdiy] What is this IC?

[Scott Stites]

Hi,

I'm hoping someone on the list can help me identify an IC - I have a tube of
ten of them, and I'd like to know if they would be useful in any synth
endeavours.

They're 14 pin DIP's labeled '221-235'.  Beneath that, they have '014
M8151' printed on them.  There is no manufacturer identifier on them.  I've
googled and found nothing.  Does anybody know what these things might be?

Thanks,
Scott