PVM picture centering and sync issues

[orangemonkey]

Hi!

I recently started to use CRT_emudriver and GM with a PVM 1953MD and they have worked very nice so far. The only issue I am getting is that the picture is shifted to the right and I can't center it (

) . I've tried changing the HFrontPorch, HSyncPulse and HBackPorch values, but I lose sync every time i modify them. I also use the PVM to play on some consoles, so I would prefer not to use the service mode to center the picture.

I am using the Arcade 15.7-16.5 kHz profile, but Arcade 17.5 kHz and Generic 17.5 kHz gave me the same results. My video card is a HD6850 and I am using Csync with an VGA to BNC cable.

Any advice? Thank you very much and sorry for the bad English, my first language is Spanish.

 

[Calamity]

Use Arcade OSD, it has centering options, then grab the values with the "Copy modeline to clipboard" option, and use them in GroovyMAME.

[Paradroid]

I also use the PVM to play on some consoles, so I would prefer not to use the service mode to center the picture.

You'll be able to change the H centering of GroovyMAME using the method Calamity advised but if you struggle to get your consoles centered with each other then an Extron processor will help.

[orangemonkey]

I solved the issue. I wasn't disabling and re-enabling the EDID emulation. It is perfectly centered now, thanks!

[HiroWorship]

I'm curious as I want to try to center the image on my PVM as well - does this mean that in order to center the image using ArcadeOSD I need to turn off EDID emulation first, make the edits, and turn it back on?
Also, if I "copy modeline to clipboard" using ArcadeOSD, where do I paste it? mame.ini?
I am using modelines generated by VMMaker, if that matters.

Thanks very much!

[buttersoft]

does this mean that in order to center the image using ArcadeOSD I need to turn off EDID emulation first, make the edits, and turn it back on?
Also, if I "copy modeline to clipboard" using ArcadeOSD, where do I paste it? mame.ini?

EDID enabled means you can centre every mode bar the one in the EDID, which is 640x480@30i for the desktop. It won't hurt to turn it off and turn it on again, i guess. You can always use the 640x480@60i instead, if it doesn't give you problems.

You copy down the three values you need. Below is the arcade_15 range line, showing where the values go in the mame.ini file's crt_range0 line. These are the values for HFrontPorch, HSyncPulse, HBackPorch respectively, and you can find them in ArcadeOSD when editing. Your values will be different, remember.

      crt_range0  15625-16200, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 192, 288, 448, 576

This sets your range line in mame.ini. The other option is to take those new horizontal timing values, edit monitor.ini and redo VMM to setup your modelines again with the new values. IF find the former works best for me. And for specific machines or games you create neogeo.ini or ffight.ini files in the mame/ini directory, if needed, with the range line adjusted.

[HiroWorship]

Thank you so much for the detailed instructions, buttersoft!
I will give this a try.

Much appreciated!

[Paradroid]

You copy down the three values you need.

I always take a photo of the CRT with my smartphone once I've got everything right in arcade_osd (my handwriting has been in steady decline since my early 20s).

My phone is like a library of settings for all the CRTs I run in my arcade cabinets.