Aha! Great news, and thanks for posting your solution. Now that makes a lot of sense. The surprising thing is that the default
crt_range setting in
monitor.ini didn't work! We like to assume the defaults to be "safe".
BTW, the value you changed (from 8 to 6) is not the
Hsync pulse, but rather the
backporch setting. The number before that (4.700) is the Hsync pulse width in milliseconds (4.7us), which is NTSC standard, so no need to adjust that usually.
You may also find some benefits from adjusting the
frontporch, which is the number (default 2.000) before Hsyncpulse. Both front/backporch numbers will affect each other and where the picture sits on screen (if at all!).
By coincidence, I've just spent my morning trimming these frontporch/backporch numbers for the component-modded CRT TV + GreenAntz in my Aussie lowboy cab. I've managed to get it looking perfect, or as close as reasonably possible. (FWIW, I've been using 720x480i as my desktop resolution (and also for Attract-Mode frontend) for a while now. I know, 640x480 is 4:3, and maybe it is just a TV thing, but to me the extra pixels make it look crispier and makes sense anyway as NTSC is 720x480i already).
Instead of using Arcade_OSD to trim everything, like you've done for 640x480, you can edit the presets in
monitor.ini and re-generate/re-install the complete set of video modelines. That way the sync/geometry changes affect everything automatically. Apparently you can do it all with Arcade_OSD too, by editing the one modeline and then cut-and-paste for the rest, but I've never done it that way myself. I think it makes more sense to edit the presets directly so the adjustments apply to everything. Anyway, you can now do that too as you know the right values (approximately) now.
For a complete breakdown of what the crt_range/monitor.ini/presets numbers mean,
check out this thread where Calamity explains all.
When you've done sorting it out, you might want to post your Hantarex results there.
Hi Zebidee;
Many thanks for answering.
Yes I have read the Ken solution, but my Hantarex does not have the three pin connector. So this in not the problem.
Also I have the video amplifier from ultimarc to raise the 1Volt rgb to 4V to an arcade monitor, so the H and V sync is already joined on the adapter.
I explain what thing has worked with the faulty sync. As the problem only apears on 640x480 resolution I have edited with Arcade_OSD the Horizontal Geometry, in this section I have changed the H pulse sync from 8 to 6, and saved the changes. It worked, I do not know what I am doing but it worked, now I have a stable image.
The problem was that It was very diffcult to the monitor to sync the image on 640x480, with the potentiometers was very hard to find the exact point and also once the image was sync it shakes a lot.
If someone has the same problem try to do the mod on the modeline. I repeat that I do not know that I did but it worked.