Software Support > GroovyMAME
Pixel doubling on 31khz monitors with custom drivers?
Calamity:
--- Quote from: lettuce on July 22, 2011, 02:21:45 pm ---Yeah i would usually leave it as auto, but im wondering if it would be possible to sort out some convergence problems i was having with my Pentranic monitor. I dont know if you remember Calamity i stated this problem in the main Groovymame thread.......where basically on the far right side of the display the geometry is all screwed up, basical about a 1-2 inches of the far right side of the display appears to be squashed up, if i move the screen left via the monitors OSD the problem seems to disappear but then ive lost a good part of the left hand side of the display. You can really notice this effect on a scrolling game when sprites come in from the right their really thin and the get to there normal width the closer they move to the centre of the display. Here a pci showing the problem
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Please test this: use your monitor's osd to increase the horizontal amplitude so the red squares on the sides of that pattern get hidden, getting a clipped picture on the sides. Notice if the resulting white squares pattern on the borders looks better now than before. If it looks the same, then there's nothing that a modeline could improve about that, on the other hand if the geometry is better then we might try adding some borders to the modeline and correct them back with the monitor's osd.
lettuce:
--- Quote from: Calamity on July 22, 2011, 02:53:46 pm ---Please test this: use your monitor's osd to increase the horizontal amplitude so the red squares on the sides of that pattern get hidden, getting a clipped picture on the sides. Notice if the resulting white squares pattern on the borders looks better now than before. If it looks the same, then there's nothing that a modeline could improve about that, on the other hand if the geometry is better then we might try adding some borders to the modeline and correct them back with the monitor's osd.
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Ok i have tried what you suggested and stretched out the horizontal szie, and it did indeed make the next set of squares a bit better, i then stretched to the next set of squares in and again was better still...but then the horizontal bar was maxed out at 100 on the monitors OSD so couldnt increase it more! So will i be able to make this better with a modeline modification?
Calamity:
--- Quote from: lettuce ---Ok i have tried what you suggested and stretched out the horizontal szie, and it did indeed make the next set of squares a bit better, i then stretched to the next set of squares in and again was better still...but then the horizontal bar was maxed out at 100 on the monitors OSD so couldnt increase it more! So will i be able to make this better with a modeline modification?
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That's fine, however that's the max we can improve it. Now what I would do is use Arcade_OSD to find the right porch (borders) values. For this test, select a mode with high horizontal resolution if possible, above 640 would be fine, make sure it's a custom mode, not a native one. Go full screen and then set again your monitor's osd horizontal amplitude to 100. Right and left borders will get hidden (overscanned). Now go to the Horizontal Geometry submenu, and start increasing front and back porches until the whole picture fits the screen again. When you are done, write down the porch values to use them in your monitor_specs line (let us know them so we can help).
EDIT: Take care, never try to set one of the modes marked as "native", those can reach 120 or even 200 Hz! Always use the "custom" ones, that are the ones produced by vmmaker with the correct timings set by us.
lettuce:
Ok have done what you suggested, but when i increase either the back or front porch values the screen horizontal size doesnt change at all, stays the same. Any ideas??
Calamity:
--- Quote from: lettuce on July 22, 2011, 05:05:35 pm ---Ok have done what you suggested, but when i increase either the back or front porch values the screen horizontal size doesnt change at all, stays the same. Any ideas??
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Are you pressing P1 ("1") or Enter to test changes?
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