Added link to my Twitch channel. Also, while I'm the guy behind "The MSX Channel" on YouTube, it's by no means official, as the MSX trademark itself is owned by MSX Licensing Corporation, and I'm not affiliated with them.
Basically - small patch which eliminates STA $2001 = 11100000 making picture bright and colorful as it should be.
My guess is that originally dimmed down picture were intended to make kids’ eyes less tired from playing and in my opinion - but sadly results made it go to other extreme - dimmed down picture looks boring.