Ok... Here is something I want to show you... This may look like boring BASIC stuff you've seen 100 times, but please hold on... It is not long and I promise it the video gets more interesting towards end. 
Modern BASIC stuff by NYYRIKKI
you have ported the whole msx basic in symbos.... have you ?? 
Well... Yes
Simply amazing 
Mind blowing the moment of switch
Woah!!! that's very cool! How does SymbOS handle the fact that you are switching to screen 2 in fullscreen, and then once the code runs, go back to the regular OS screen?
That is the SymbOS magic my friend
Woah!!! that's very cool! How does SymbOS handle the fact that you are switching to screen 2 in fullscreen, and then once the code runs, go back to the regular OS screen?
Very well, thank you for asking.
... from technical point of view it works so that I draw a 1000x1000 window (without content) on top of the desktop so that everything gets hidden behind it. This stops SymbOS from updating the screen, so after that I can do what ever I want. When I'm done I ask SymbOS to change screenmode back and close the window.
