How can I record over an existing sound chip?

I get several birthday cards or little toys that have sound chips inside with a prerecorded message.  The board looks simple but I can't figure out out to re-record my own sound onto it.  Most of them have a big black plastic dot over (something).  Does this make it impossible to get to the actual chip/program? (Yes, I know I could BUY one -- I want to repurpose the several I have).

rickharris4 years ago
cant - you will have to buy a speech module - OR there are some cards out there you can record your own message on.
You won't be able to do anything with them. Especially those that have the black epoxy over the chip.