I have the reverse problem! I have the same clock, and it's the model that is only a 12h display. I want to hack it to work in 24h mode.

I know that this thread is really old, but I'm bumping in the hope that somebody will know the answer, 2 years on! Does anyone recognise this chip?

 

Welcome to the forums.

Your post hijacked a 2 year old thread - http://forum.allaboutcircuits.com/showthread.php?t=13871 - so now you have your own.

Good luck.