Neo Geo into Dell P2014H LCD

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  • #23085

    I’m planning to hook a Neo Geo up to a Dell P2014H LCD via the latest OSSC. Neo Geo resolution is 320×224 and the monitor’s native res is 1600×900. Will 4x mode work or will the difference between 900 and 896 cause problems?

    #23087
    Harrumph
    Participant

    Default output in 4x mode is 960 (4*240), You can set v.active to 225 for 900 output. If it works is another matter, but monitors are usually quite tolerant. Another issue is how the monitor scales input (ie it could force 16:9 output), again hard to know until you actually test it.

    A bigger issue with neogeo is usually its total line output (264) and low reresh rate.

    #23088

    Sounds tricky. Are there other parameters to experiment with if things get weird? Forcing 4:3 for example.

    #23110

    Here what I’ve found:

    2x stretches to 16:9
    3x looks correct
    4x is stretched and positioned strangely
    5x is almost correct but cuts off just a bit of the left and right sides

    I think 5x looks a bit better than 3x. Can I prevent 5x from cutting off the sides?

    Also 5x only works when using an HDMI cable to the monitor. It doesn’t work at all if doing OSSC -> HD Fury VGA -> monitor. Can I make VGA work on 5x?

    Or maybe I should be trying to fix the stretching and bad positioning on 4x since it’s closest to the monitor’s 1600×900 native res?

    #23111
    Harrumph
    Participant

    Your display seems to always want to fill to 16:9. That’s why 3x and 5x looks correct but not the other two. You need to find the setting on your display for 4:3 (for 2x mode) or unscaled 1:1 mode (for 4x mode).

    Can I prevent 5x from cutting off the sides?

    You can increase h.active (and decrease h.backporch to re-center the image).

    Forcing 4:3 for example.

    You cannot force aspect on the display by any setting on OSSC. OSSC sends what it sends, the display scales to what it wants to scale.

    Or maybe I should be trying to fix the stretching and bad positioning on 4x since it’s closest to the monitor’s 1600×900 native res?

    That’s what I would go for. Note that you cannot get 4x output to 1600 active horizontal.* If you tweak v.active to 225, the output (active area) will be 1280×900. If your display has no way to display that 1:1, then this mode is not an option.

    *(in 4x mode h.samplerate is 1560, which is less than 1600, and if you increase samplerate to above 1600 you will screw up the aspect ratio)

    #23123

    My monitor doesn’t have 1:1 mode but I can’t quite grasp why that prevents me from using 4x.

    Besides 4x, which line mode would you work to optimize on a 1600×900 LCD?

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