Post by thread:Anything special about programming OTPs?

I've programmed several PIC16C64 40pin devices that are UV erasable. I then bought 2 PIC16C64-20/L OTP 44pin PLCC devices. I built a 44pin PLCC to 40pin DIP adapter (triple checked the pinout). First I tried using PICStart Plus's CheckBlankOTP option and it said the device was not blank. It also said the code-protect fuse was on and the clock was set to RC. I tried programming the device anyway and it seemed to take forever. It finally stopped about halfway so I cancelled it. When I read the device again the code-protect fuse was off and the clock was still RC (even though I was programming it for HS). The ROM data was something like 390A (hex) everywhere, not my code. Any ideas? Did I get two bad PICs from DigiKey? (I doubt it). What did I do wrong? -tim