slightly more interesting was the Korean multigame carts with NES games showed here

http://www.nesworld.com/snes-nes20in1.php

and included in our list as super20m. Once found the menu bank

[Linked Image from mamedev.emulab.it]

it was not so difficult to get the rest of bankswitch mechanism.
[Linked Image from mamedev.emulab.it] [Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it] [Linked Image from mamedev.emulab.it]

the interesting game is the 13th game, an "original" tetris clone (original in the sense that it's not a NES port)

[Linked Image from mamedev.emulab.it] [Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it] [Linked Image from mamedev.emulab.it]

A few NES games have glitches and there is no sound, so the work is not complete, but it's a promising start