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Idly wondering why original Mac displays were 342 pixels high. Width had to be a multiple of 8, but at 4:3 aspect ratio, it should be 384 high (like Color Classic).
And the difference in memory is 3kb … doesn't seem like that's the reason.
Is it a memory throughput limitation?
@uliwitness yeah maybe it gave the vertical blank task enough time. The combination of screen size and refresh frequency allowed for about 16ms pause between screen updates.