Hacking an OTP token

The author hacked a One Time Password Token and found out it was using a PIC controller.  He modified it to display what he wanted.  Neat hack, but could be allot of work for other tokens out there.  However I may crack a few old ones I have open to see what they have.

http://hackaday.com/2013/10/15/running-custom-code-on-cheap-one-time-password-tokens/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+hackaday%2FLgoM+%28Hack+a+Day%29