I think you have your terminology crossed. All of those old arcade game monitors (and indeed any SD tube TV) scan at 15 kHz. It is why you can hear a very distinct whine at 15 kHz when you walk into the room and a tube TV is running.
So let's bust out the math.
15 kHz = 15,000 cycles / second
Say we need a game to run at 60 frames / second.
15,000 cycles / 60 frames = 250 cycles / frame
So at 60 fps, each individual frame can have 250 dedicated scan cycles... which is why so many of those games had a vertical resolution in the neighborhood of 250 lines.
Anyway, a 15 kHz monitor does not in any way mean the game can't be 60 fps. Almost all monitors were 15 kHz back then.
Oh hell. The blue shadows and strawberry milk are spreading.
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