In case someone can provide more info (better pictures, continuity testing) about those carts I would appreciate

Interest: PAL chip in not so common suqare PLCC package, weird DIP40 blob addon (MMC3/VRC2/4?)

Source: http://forum.contrabanda.eu/index.php?topic=855.msg10793#msg10793

Two EEPROMS, Two PALs

Source: https://forums.nesdev.com/viewtopic.php?f=9&t=16662

Interest: presence of crystal oscilator suggests some processor onboard?

Source: private photo from one of Famicomworld.com members

Interest: lots of chips - interesting mapper

Source: https://imgur.com/a/DbaJY

I saw this cart also somewhere [url=http://www.emu-land.net/forum/index.php/topic,53818.0.html]here[/url] and on some ukrainian auction portal, but the price+shipping was not acceptable.

Interest: MMC1+lots of chips, why they needed 73133 (13-input NAND gate?

Source: https://commons.wikimedia.org/wiki/File:Dendy_cartridge_PCBs.jpg

Interest: How the sim card is accessed via famicom?

Source: http://cah4e3.shedevr.org.ru/bonza.php

Interest: Unknown Kaiser PCB

Source: http://forums.nesdev.com/viewtopic.php?f=9&t=7912&start=450#p194067

Interest: Lot of chips

Interest: Lot of chips

Source: https://www.famicomworld.com/forum/index.php?msg=178973