This is THE BEST Mask for vertical game (Donkey Kong, Galaga, Space Invaders, HunchBack ,1941 etc etc) LINK , download and unzip in artwork folder (mame)
(No HLSL)
Copy your MAME .ini out of mame folder ,
Rename the file mame .ini, with the name of the ROMS we want to start the game .
Open file this .ini , in the .ini in effect file, write the name of the file you downloaded
save file,
put in mame folder
ENJOY !!!