CompuServe Messages

I entered the Dobbs formula and I did get the same answer, sortof. All the bits are inverted between the answers, so that when I get $9001, the Dobbs formula gets $8009. I download three different CRC-16 calculators from the IBM forums yesterday. All three were specifically designed to calculate the CRC of a specified file. All three gave me three completely different answers when applied to *any* file I gave them. Slightly annoying that. I've yet to implement the source code into a test program. I hope to find that the different programs ignored or used non-text characters or some other believable reason they shouldn't match. Does anyone know of some data laying around the forum, IFF or GIF images and stuff, that has its own CRC inside? I could use that to check my program. Thanks, Mike McCormick