Just FYI, PAL and NTSC are field based, not frame based. PAL is 50 fields per second, and NTSC is 60; a field is either the odd or even lines of the display. So that's 525i/50 or 480i/60
The NES always sends the shorter type of fields, so for NTSC you actually get a little over 60fps with the same 240 lines every fields; it's not standard NTSC timings, it's 240p60; same deal with PAL. The SNES and Genesis could optionally output interlaced video, but only a handful of games did.
The NES always sends the shorter type of fields, so for NTSC you actually get a little over 60fps with the same 240 lines every fields; it's not standard NTSC timings, it's 240p60; same deal with PAL. The SNES and Genesis could optionally output interlaced video, but only a handful of games did.