Description
This option can help reduce blurriness in games by increasing the scale of a games graphics before MAME displays it. This means that direct 3d or direct draw doesn't have to scale the graphics up as much.
Example
mame <gamename> -prescale
Command Format
<gamename> -prescale <amount>. The amount is multiplied to the original games resolution. MAME will also decide if it's too much when it picks the screen resolution.
MAME's Default Setting
1