What's amazing about this hack is it's literally two lines of assembly
In TFA:
MOVE.B #2, $FF8260 ' Switch both GLUE and Shifter to mono
MOVE.B #0, $FF8261 ' Switch Shifer back to low-res
I always love seeing people discover new things about old computers. It's always fascinating the kinds of things people can get them to do. Especially ones like this without any modern day hardware mods. Just some clever programming.