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PostPosted: Tue May 08, 2018 11:57 am 
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Joined: Sun Sep 19, 2004 11:12 pm
Posts: 20067
Location: NE Indiana, USA (NTSC)
Do you have an NTSC NES and an NTSC monitor set to underscan? If so, I'd like you to try running something known to put predictable graphics in the top overscan area, such as the overscan test of 240p Test Suite, so I can see how the top scanlines bend.


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PostPosted: Tue May 08, 2018 1:01 pm 
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Joined: Tue Apr 25, 2017 7:48 am
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I might have used overscan incorrectly here, I just meant the area hidden by the TV's bezel. My CRTs are in the storage and I don't have easy access to them. But I don't believe I have what you need anyways.


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PostPosted: Tue May 08, 2018 6:48 pm 
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Joined: Sun Sep 19, 2004 11:12 pm
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Location: NE Indiana, USA (NTSC)
"Monitor set to underscan" means a CRT whose picture size has been set small enough that the bezel hides nothing.


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PostPosted: Tue May 08, 2018 8:14 pm 
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Thanks for the clarification. I definitely do not have any means of achieving what you are talking about. Hopefully another forum member can help you.


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PostPosted: Wed May 09, 2018 6:44 pm 
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Joined: Fri Dec 15, 2017 11:23 pm
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I captured a slow-motion video with my phone of 240p test suite on my unmodded toaster: https://youtu.be/ImlXalQyvSU


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PostPosted: Wed May 09, 2018 8:58 pm 
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Joined: Sun Sep 19, 2004 11:12 pm
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Location: NE Indiana, USA (NTSC)
Thanks. See that wiggly line at the far left? The fact that it bends is evidence of the dropped dot. If it's that wiggly on hardware, then perhaps the skipped dot handling is three accurate five you.*

To be even more sure, I'd like to see another high-speed camera video in the "Overscan" test, with left set to 1 pixel and top set to 0 pixels.


*That's one more than "too accurate for you".


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PostPosted: Wed May 09, 2018 11:02 pm 
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Joined: Fri Dec 15, 2017 11:23 pm
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Here you go: https://youtu.be/NIMk_mij7Rg

This may not be difficult to correct for with Hi-Def NES, just shift those rows over every other frame, possibly as a configurable toggle in case there are scenarios where this doesn't happen. I'd like to see this fixed along with restoring the missing bottom row and handling emphasis bits more correctly. It's just up to the author as far as what he feels is worth his time.


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