System CLX L61 with flashcard slot.

I need to write some data (2 words - engine hours) to a flash card to ensure the data is conserved in the event of a processor problem (e.g. battery goes dead). I know there is an example of read / write to a flash card available from A-B and I've got a copy of it. What I can't believe is how big the program is for it.

Has anyone had a go at this and come up with something simple, I've had a quick trawl through the code and there seems to be a MSG instruction involved but also a lot of error checking (which I know is important).

As usual time is running out on the project and this is a last minute request with no time to do any testing/development.

Any suggestions / help much appreciated, thanks.