Software Support > GroovyMAME

Basic CRT EMU driver questions

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Tatas:
Also, the mode that MK is picking doesn't really even look right.  It doesn't flip, but it definitely doesn't look as good as what ever mode the original Custom settings with 120 modelines chose.  That seemed spot on.

Calamity:
There's something else I forgot.

Don't use the NTSC settings for serious stuff specially with magic resolutions. The problem is that as the hfreq window for NTSC is so narrow, it just creates too few modelines. That's why you're seeing very few custom modes in Arcade_OSD. This wouldn't matter if it wasn't because the dynamic modeline method does not work unless at least 17-20 custom modelines are defined in the system. That's why you're seeing very few custom modes in Arcade_OSD.

Tatas:
Ok, I've verified that I'm seeing 25 custom modelines created as they all show up in Arcade_OSD.  I've attached 3 pictures of what my Arcade_OSD looks like.  The first has the initial batch of modelines created (I don't think they are the magic ones, as they don't start with an xres of 1234).  These all display properly.  The second image is of some of the "Magic" resolutions.  None of these display properly, they all flip.  I've tried changing the Hfreq all the way down to 15300.  So my modeline eventually looked like 15200-15300, 49-65.00, 2.000, 4.700, 8.000, 0.064, 0.160, 1.056, 0, 0, 288, 448.  The third picture show's what the flipping image looks like.  I'm wondering now, if the issue isn't the fact that the xres is too high.  If it's trying to display 1234 as the X value, it will never show properly.  I think that 720 is the max value that this TV will display.  I've got the desktop running at 720x480, anything higher and it also will flip.

Calamity:

--- Quote from: Tatas on December 22, 2011, 06:34:27 pm ---I'm wondering now, if the issue isn't the fact that the xres is too high.

--- End quote ---

Well, I must admit that it looks like that's the issue indeed, though its VERY odd, I mean the TV should not care about horizontal resolution, only vertical resolution is critical for CRTs. It's also strange that some normal modes also had the same flipping problem, is that right? Does it fail either with progressive and interlaced modes?

Looking through your modelines everything seems fine. There are two possibilities I can think of:

- Video modes are not properly created by the driver, for whatever reason.
- Your TV has a digital chassis that's introducing some issues.

Of course the best test you could do is trying to plug another TV while the screen is flipping. You can also try to switch it off and back on to see if the mode is properly recognized by doing so. The chasis might be fooled by the signal changes or something. I'm sorry I can't be of more help.

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