Feature request: 60Hz mode

[Thelypody]

Despite the computer's Japanese origin, the current implementation of the core appears to run in 50Hz with no visible option to switch to 60Hz. This makes Japanese games released for the computer, such as several arcade ports from Namco, to run slower than their intended speed. An ability to enable 60Hz video mode would be a welcome addition, inviting more people to engage with historical titles for lesser known computer systems.