Reply To: Tips & Tweaks: Lx3, Lx4, Lx5 modes

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February 9, 2018 at 8:37 PM #19154
James-F
Participant

    I successfully managed to tweak advanced timing in Generic Line3x mode (960×240) and 480i Line2x (bob) mode so all my consoles have almost perfect 4:3 ratio with very minor overscan between them, which my old AOC monitor took without much fuss.

    I had to jump back and forth between console and check that one console adjustment did not crop some area from another console, until all consoles fit just fine in 4:3 size picture with some minor underscan too support them all.

    240p Line3x mode (960×240):
    H.samplerate 1260 (from 1170)
    S.synclen 54 (default)
    H.backporch 179 (from 128)
    H.active 960 (default)
    V.synclen 3 (default)
    V.backporch 15 (default)
    V.active 240 (default)

    480i Line2x (Bob) mode:
    H.samplerate 940 (from 858)
    S.synclen 62 (default)
    H.backporch 110 (from 57)
    H.active 720 (default)
    V.synclen 3 (default)
    V.backporch 15 (default)
    V.active 240 (default)

    In short:
    Increasing H.samplerate will stretch the image.
    Increase H.backporch to bring the image to the center.

    Some screen pics I took to demonstrate the result:

    PS1 480i
    PS1 480i

    PS1 240p
    PS1 240p

    Genesis 320x224p
    Genesis 320x224p

    Genesis 256x224p
    Genesis_256x224p

    Genesis 480i
    Genesis_480i

    Snes 256x224p
    Snes_256x224p

    Snes 256x239p
    Snes_256x239p

    Snes 480i
    Snes_480i