BizHawk is a multi-system emulator written in C#. BizHawk provides nice features for casual gamers such as full screen, and joypad support in addition to full rerecording and debugging tools for all system cores.
These numbers are derived from the 2010 whitepaper: NTSC's 4*(315/88 MHz) is doubled to give the master clock rate, which is then divided by 1820 cycles per line and 262 lines per (progressive) frame.
This looks perfectly correct. I'm at a loss to explain why it was ever wrong; I was aware of the type of crystal used (it's a common NTSC crystal) and the other details of the video system at the time.
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