17c44 & 16c57c Are these any good?

This might sound like a silly question but I'm gonna ask it anyway....

I have recently acquired a few USED PIC chips and I can't seem to find much info on them, I think they are old hat now but I just want to know if they are of any use. Are these things OTP or can they be erased?

I have 2 of 17c44 & 8 of 16c57c

Thanks...

hackableFM...

With the sole exception of the 16C84 a the C (CMOS) are One Time Programmable.

Ohhhhh bugger.... bin them then...

It was worth asking.

OK Thanks dude!