What's the difference between the VGA's Dot Clock rate (divide by 1, 2 or 4) and character clock (divide by 1, 2 or 4)?
How does the DIVIDE SCANLINE CLOCK BY 2 affect ouput?
How do any of them affect output?
Author of the UniPCemu emulator.
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UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io
also the divide scanline by 2 bit tells the card to count each scanline twice when outputting to the monitor. Based on VGA hacking on my end that apparently means that the CRTC values for vertical scan are effectively doubled. most bioses seem to set the bit for CGA and EGA modes on VGA hardware where older software might expect a 200-line video output. it also ties into how VGA cards emulate CGA interleaved memory access.
You might also find this helpful: https://m.youtube.com/watch?v=9NCJ3B1NxGg
