Software Support > GroovyMAME
Trying to create monitor presets for KT-2914 (Betson-Kortek) MultiSync
RetroACTIVE:
--- Quote from: Calamity on February 10, 2012, 09:38:33 am ---
--- Quote from: RetroACTIVE on February 10, 2012, 09:01:14 am ---Just a note... messing with the porch settings really didn't pull the pic in enough... when I was tweaking it it really didn't snap into place until I messed with the dot clock setting.
--- End quote ---
You mean the vertical porches don't you? But did you just use the vertical centering or you tried increasing each porch individually, increasing the total number of lines by doing so? What I'd do is to keep vfreq locked at 54.7 and increase the vertical front porch.
--- End quote ---
Yeah... I just tried out your suggestion of locking the vfreq... I couldn't get the image any better than this:
I then tweaked the horizontal settings (leaving freq. locked) and got the image to align properly... but it had an affect on the modeline settings:
:dunno seriously... thanks for all the help!
Calamity:
Oh, I didn't mean that. I'd suggested locking Vfreq *once* you are ready on this state (Vfreq = 54.7 Hz):
Maybe explaining a little bit what I think it's going on helps. Usually, multisync arcade monitors need different geometry adjustments depending on the Hfreq value. So we'd group different video modes that more or less share the same horizontal frequency inside a monitor_specs range, and we'd find the right porch values for them. This works very well for my analog Hantarex Polostar, and the digital WG seem to work similarly.
But yours is the first case of a monitor that I've seen which seems to need different settings depending on the VERTICAL frequency. If you look at the pictures in your post from February 10, there we have two modelines for 400x256, with horizontal frequencies of 16.717 and 16.690 each, which are very similar values, but despite of that they show rather different geometry. It's not only that the one with 54.7 Hz is shifted down, but it looks as if the vertical amplitude was much wider. It seems like the fact that its vertical frequency is 54.7 Hz instead of 60.00 Hz is making a difference.
That's why we need to determine which values make the picture all right when working at 54.7 Hz, so lock the Vfreq there and play with vertical porches until you find the sweet spot, that might show the way.
RetroACTIVE:
This doesn't work the way I am expecting it to...
I set the modeline settings to the mk settings and the frequency is 59.877 not 54.7 Hz as shown in the previous photo... so I don't know what I did before... probably messed something up.
Tweaking the vfront porch values doesn't create a sweet spot and ends up adding more lines if I go back and look at the modeline values.
I've got to double check what I did. I need a day to sit down as work on this... I'm trying to squeeze it in my day and am not giving it its due. :(
Calamity:
Hi RetroACTIVE,
The process is:
1-> Unlock Vfreq
2-> Enter modeline values, including DotClock. Vfreq should become 54.7
3-> Lock Vfreq
4-> Tweak geometry, porches, etc. Vfreq should keep close to 54.7 despite the changes.
RetroACTIVE:
--- Quote from: Calamity on February 17, 2012, 02:55:13 am ---Hi RetroACTIVE,
The process is:
1-> Unlock Vfreq
2-> Enter modeline values, including DotClock. Vfreq should become 54.7
3-> Lock Vfreq
4-> Tweak geometry, porches, etc. Vfreq should keep close to 54.7 despite the changes.
--- End quote ---
Got it...
I've locked the freq... Then go back into vertical geometry and as soon as I touch V front porch... it jumps to 59.xxx.
In other words it's not staying locked... Is there a step I'm missing?