O agree rith the IP901 comments. The IP901 came with the 8050 which was the predecessor to th C500. I believe that the Fiery number is actually S300? I sure don't know why it would not work. I don't think there were any significant changes between the 8050 and the C500 other than attempts to improve paper feed.

I seem to recall that it was common to add machine memory when connection the IP901. You may ask if there is any chance that your tech would have extra memory from the machine he has taken the IP901 from.

I have no real experience with the C500 but quite a bit with the 8050 with an IP901. If there are more differences than what I mentioned, I am sure someone will add them here.