I built an arcade machine with a RP3, I only really play Galaxian.
So I bought a new widescreen monitor.
Rotated it 90 degrees
Found the command line to update the config.txt file
Now though - the graphics are a bit jumpy... and no where near as smooth as they were when the monitor was in normal widescreen layout.
(this worked really well, but the display was small in the middle of the monitor with lots of black either side.
Help please (I am a Pi novice!!)
Thanks in advance.