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Author Topic: Horizontal centering using ArcadeOSD & VMM  (Read 472 times)

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RKnees

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Horizontal centering using ArcadeOSD & VMM
« on: January 03, 2021, 08:41:37 pm »
Hi there! First post, let me start with a big thanks to everyone involved in GroovyMAME, crt_emu driver etc, especially Calamity. Due to this forum and reading through a lot of threads and tutorials, Iím now running a B&O mx7000 crt with a PC (intel g3258 overclocked)setup through an UMSA. Mainly Iím using the emu driver in combination with retro arch super resolutions and so far it is working very well.

Iím trying to learn a lot about how crt works, and now Iím struggling to understand how to effectively Center my screen without manually editing modes in arcadeosd. What Iíve learned so far is:
- adjust h front and h back porch and always add same amount to both (or use h center)
- always test using different resolution than desktop resolution due to read only issue
- most accurate for calibrating is to use highest super resolutions
- the modes will be generated using the modelines as Ďinstructionsí
- change crt_range to add the adjustments through all generated resolutions

Please correct me if Iím mistaken!

And the last point is where Iím struggling; when I calibrate the horizontal Center correctly on letís say 2560x240@60p, and copy the horizontal porch values from the mode line into the monitors.ini(replacing), will that work? I saw that those values are different on each separate resolution, so how will vmm generate the right amount of adjustments on all other resolutions? How does the crt_range work?

Sorry if itís already written down somewhere, I tried to read through but could not find a good explanation thus far.
Thanks!

Arnie

Info:
Currently using NTSC/60/525 monitor preset due to weird wavey toplines on Arcade 15.


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« Last Edit: January 04, 2021, 07:36:49 am by RKnees »

Calamity

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Re: Horizontal centering using ArcadeOSD & VMM
« Reply #1 on: January 04, 2021, 08:10:58 am »
Hi RKnees,

And the last point is where Iím struggling; when I calibrate the horizontal Center correctly on letís say 2560x240@60p, and copy the horizontal porch values from the mode line into the monitors.ini(replacing), will that work? I saw that those values are different on each separate resolution, so how will vmm generate the right amount of adjustments on all other resolutions? How does the crt_range work?

Ideally, horizontal porch and sync values (in Ķs) would be equal on each separate resolution, regardless of what the modeline (not crt_range) numbers are. This is because modeline numbers are relative to the particular resolution, while crt_range numbers are absolute figures (= time in Ķs).

However, you may notice that in practice, porch and sync values in Ķs are different between different resolutions created by VMMaker. This is a limitation of the accuracy that's possible when handling 8-pixel blocks that form the video modes. But the idea is they're as close as possible.

So copying the timings from one mode will indeed work: VMMaker will make the best possible approximation for each different mode based on this.


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RKnees

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Horizontal centering using ArcadeOSD & VMM
« Reply #2 on: January 04, 2021, 08:15:22 am »
Thanks for the quick response Calamity! I'll try this later today and will report back. Cheers

Edit: It worked!
« Last Edit: January 04, 2021, 10:21:52 am by RKnees »