41CL use of EXCFG, RCLCFG and STOCFG

[Podalirius]

Hi, My very best thank you for your very valuable help!!!
But Mr. Angel Martin has made me very curious:
I know that these functions operates on a four set of MMU
registers, one primary, and three secondary.
How I can create a fifth?
I have now my new Sy41CL and is a true masterpiece,
but also very useless without your help, because the
manuals are generally too technical, for me (I am a programmer
but I don't know Assembler) !!!
More and more, thank you so much!!!