An undocumented instruction(?)

[Umpal]

Just a while ago, by coincidence, I found an instruction that doesn't have any help reference in the AMOS editor nor in the AMOS printed/pdfed manual (I just hope I wasn't too blind ). I haven't seen it before. It's Map X/Map Y. When I try to print it by Print Map X I get the message Bank not reserved. Can someone shed some light on it?

[SamuraiCrow]

It's from the TOME extension.  Read the docs for it there.

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[Umpal]

Aaahhh, silly me 
I totally forgot about extensions I have