Software Support > GroovyMAME
SCART CRT TV And GroovyMAME Thread 2
Calamity:
Hi lettuce,
Nice to see you back in business. Try keeping this value as low as you can, before you start seeing problems at the top of the screen, like retrace diagonals:
15625-16200, 49.50-65.00, 3.500, 4.7000, 9.500, 0.064, 0.260, 1.200, 0, 0, 288, 448
You can use Arcade_OSD with a 256 video mode to find the right values. You won't get the picture fit inside for 256 lines resolutions, but you need to get it vertically centered for all games. Using the service manual over and over is the only solution for vertical adjustment, that's a fact.
lettuce:
So if i select the video mode 256x256, what am i aim for?, to get the test display to fill the whole TV screen? Is this for R-type and similar resolution games?? Using 256x256 in the veritcal geometry setting, if i change the 'V back porch' from '16' ln to '8ln' then the test screen fills the screen from right to left where as at '16 ln' it wasnt
So am i going about it all wrong in getting certain games to fill my display perfect??, instead of loading said game looking at the white borders then quiting the game editing 'monitor specs' line in mame.ini reloading said game again and rinse and repeat. Should i just leave the monitor specs line in mame.ini as default (dont edit it) and going through ever single (120) modelines in OSD arcade and adjusting to fit the screen that way??
Calamity:
Actually rtype uses 384x256 but the relevant part is the vertical lines so any 256 lines mode should be fine for testing.
--- Quote ---So am i going about it all wrong in getting certain games to fill my display perfect??
--- End quote ---
No, I didn't mean that. You still need to edit the monitor_specs lines in mame.ini to get things working.
But (this is the point nobody in the forum is getting yet) you can use Arcade_OSD to the find your values interacting with the screen instead of from a trial and error process. Then you write them down and copy then to the monitor_specs line. You don't need to edit all 120 modes, just one or two relevant ones until you find the good values.
Just ask whatever you need and I'll be helping.
lettuce:
So any game that has a res greater than 256 lines on the vertical will always have overscan? Is there a way i can 'trick' groovymame into display these game so that fit into my display without having to alter the vertical adjust through the TV service menu??
To be honest Calamity the OSD porgram confuses the hell out of me, i get that you can go into each video resolution and change the vertical and horizontal geometry value so it fits the screen, but other than that im at a complete lose.
So for example i have edited the values for the screen res that final fight and rolling thunder both use so it fits the screen as best it can...but what values do i have to write down for the monitor_specs line, and surely if ive only edited a few video resolutions how is this changing/altering the monitor_spec line within the mame.ini file?
So here some steps i have done,
1. selected video mode 288x224 (rolling thunder)
2. selected 'horizontal geometry'
3. altered the front porch and back porch so it fits the screen as best it can
then done the same as above for 384x224 (final fight), what do i need to do now then regarding the monitor_spec??
maybe a guide is in need for using Arcade_OSD correctly?
Calamity:
--- Quote from: lettuce on January 26, 2012, 04:29:59 pm ---So any game that has a res greater than 256 lines on the vertical will always have overscan?
--- End quote ---
Sure.
--- Quote ---Is there a way i can 'trick' groovymame into display these game so that fit into my display without having to alter the vertical adjust through the TV service menu??
--- End quote ---
Yes, you can change this value (active lines limit), so that anything above 256 will be interlaced + stretched
15625-16200, 49.50-65.00, 3.500, 4.7000, 9.500, 0.064, 0.260, 1.200, 0, 0, 256, 448
--- Quote ---but what values do i have to write down for the monitor_specs line, and surely if ive only edited a few video resolutions how is this changing/altering the monitor_spec line within the mame.ini file?
--- End quote ---
It's very easy, once you have a resolution centered, go both into horizontal and vertical geometry submenus. You'll see the values you need on the right of each line, so:
H Front porch
H Sync pulse
H Back porch
... correspond with these ones (same order):
15625-16200, 49.50-65.00, 3.500, 4.7000, 9.500, 0.064, 0.260, 1.200, 0, 0, 256, 448
... same for vertical values:
15625-16200, 49.50-65.00, 3.500, 4.7000, 9.500, 0.064, 0.260, 1.200, 0, 0, 256, 448
So the meaning of all this is not to center a particular resolution (that is overriden anyway by GroovyMAME).
What we do is to ensure that all the modelines recalculated from that monitor_specs line are similar to the one you just centered with Arcade_OSD (which values you've obtained).
--- Quote ---maybe a guide is in need for using Arcade_OSD correctly?
--- End quote ---
Definitely, you'll probably have some news soon.
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