Matthews I never used the Darrel I2C interrupt so I cannot help you. I did something with I2C few years ago, and I posted a working snippet in this thread http://www.picbasic.co.uk/forum/showthread.php?t=10141. In the thread you will find also some code using DT I2C interrupt that could help you to start with your new project.

Longing to see your working code posted!

Cheers

Al.