HP-41 MCODE quick reference

[Eric Rechlin]

As I have been continuing my massive scanning project, I have encountered an MCODE quick reference guide of unknown provenance. It came from the collection of Frans de Vries of the Dutch HP club, and he doesn't remember where it came from. It's a 20-page stapled booklet (numbered MC1 through MC20), black and white, with rounded corners on the pages, about 3.75" by 6.1". It was written for the HP-41 series, probably in the mid-1980s.

I have asked people I would normally ask about these things (Richard Nelson, Jeremy Smith, Jake Schwartz, Bob Prosperi, Wlodek M-J, and some other members of the HPCC club), and nobody is familiar with it.

You can download the book here to take a look at it. Does anyone know who wrote this, what it's called, when it was made, or anything about it?

Here is a scan of what the outside "cover" looks like: