Tectoy is a Brazillian company that still manufactures SEGA consoles (they have the license back from the 90s).
They still use the original motherboard and whatnot...
Yet, somehow, they still manage to make it have issues, seemly they replaced several of the original chips with cheaper ones that don't have same algorithms, some games notoriously have issues (Sonic 3 for example has audio problems).
Also they removed the cartridge port from the mobo... but still left the holes and space on the mobo for it.
I find all this so confusing, why not just sell either the original hardware or an FPGA based one instead of stupid hacks?
Picture of the mobo with missing cartridge slot: https://i.imgur.com/tqOM56N.png?3