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I have implemented this, and marqs has merged my changes. It will be released with the next version of the OSSC firmware (0.86). Here’s how it looks, and I’ll put the settings I’m using below the screenshots.
I believe the remaining blurring is due to my TV’s poor upscaling, along with some analog video noise coming from the PSP itself.
The settings I’m using are:
H. Backporch: 176
H. Active: 480
V. Backporch: 135
V. Active: 270
Oddly, these backporch values are not the ones I’d calculated, but these are the ones that produce a centered image.
Now, with a 960×540 image, 2x that would be 1920×1080 (1080p). Time to dig into whether a Line4x in 480p mode is possible to implement :).