This guide was for an older Master Everdrive that still worked with the Japanese region (though only with a downgraded OS). I heard the new one has problems with Mark III and the Japanese Master System.
If this is the case, I hope it will be fixed. I'm also hoping for SG-1000/SC-3000 support which the current ones do not have. There is a multicart that can run cartridge, card and cassette tape games though.
Mark III is the same console than Master System, just pin out un cardridge is different and
the fm sound, don"t exist on master system.
Yes everyone knows that the Master System is just an upgraded model of the Mark III. The FM chip do exists, the original Master System has the FM chip built-in and uses a 44-pin cartridge slot just like SG-1000/SC-3000 and Mark III. Only export Master Systems doesn't have this stuff.