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2.6 times the size of Texas

That game is 384x256@55hz.
Probably your tv isn't changing to PAL mode.

Hi Zebidee, thank you for the reply!

I don't think this is an overscan issue - the last scanline is nowhere near the bottom of the screen. I've adjusted the vertical height way down so we can be sure there's no cropping on the top and bottom, and I'm going through the video modes in arcade OSD here:

https://drive.google.com/file/d/19tWdLeG8p_jrBBt_NsxS0sWWoReADpQX/view?usp=sharing

We can see that in some modes, for instance, 320x224@60 (15.66khz), the full image is drawn, you can see the bottom white border. Whereas the very close 320x248@59.97 (16.13khz) doesn't reach the bottom white border, and in fact, you can see that it in fact stops mid-scanline here...

My first thought is that anything over 15.6kHz can't be displayed by this Sony KV-XXX, but then 336x224@60 (15.66kHz) works fine but one at a little lower frequency 384x240@59.98 (15.65kHz) does not work.

Is there something here I can adjust in the range when generating modes, or the service menu, that could assist with these couple modes that appear not to be drawing the whole image? Or is maybe something else going on here - failure to sync is one thing, it obviously can display these modes, but cutting off scanlines is
something else...

My preset is

monitor "roger", "Sony KV-20FS100", "4:3"
        crt_range0 15625-16750, 56.0-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 170, 262, 448, 526


I did just replace my modelines with the ntsc preset, rebooted, and it doesn't seem to have done anything.

Is this what foldover looks like? I thought foldover looked like the image "bouncing" off the top or the bottom and drawing again over top of itself, like it had been folded at the edge, but I could have a misconception.

i stand corrected 

 

Hey all! I think I've been living with this problem for years and it never really registered that maybe something was wrong...

So, the full image isn't drawn to my CRT. I'd say in 240p, the bottom 10 lines or so are missing, and this is really weird, but it also stops drawing halfway through the last scanline.

Hi Roger, that's "overscan", deliberately oversizing the picture by 2%-10%, a feature of most TVs. When just "watching TV", people want to image to fill the screen. It would look weird otherwise. Losing a few lines/pixels around the edges doesn't matter, because all the main action happens in the middle of the screen.

Overscan isn't great for gaming though.

For vertical size/overscan, mostly it is best to try to adjust within the TV's service mode. Do you already have access to that?

Unfortunately you can't do much about vertical size by adjusting CRT_emulator monitor presets (porch settings). This approach can give good results for horizontal overscan though.

Some other ideas:

- run games in a higher resolution - for example, running 224-240p games in 256p or even 264p. You can force this by [romname].ini files, or force GM's hand by only creating 256p modes (no 240p) in the first place.
- While running Groovymame and in-game, press TAB to access a menu and various video size slider controls.

Additionally, I'm guessing this is related, there's maybe an extra one or two scanlines above the top of my screen that are mostly white but changing colors. No pic because I adjusted my CRT to push that off the top and promptly forgot it was happening. But now that I'm actually giving this some thought, it's probably wrapping around and trying to draw the bottom part of the image before the first real scanline.

This may be "foldover", an early sign of the TV's vertical deflection circuit starting to fail. Most likely aging electrolytic capacitors. Your TV is likely 20-30 years old by now. It sounds very minor at this stage, but you may want to consider getting the TV recapped.

Your not in the US correct?(shame) i would go with the Virtuo, the earlier models have a ps2 keyboard port 

A lot of work went into this build. The goal is to get every Merit game ever made into one build. More years are being added all the time. I think the first version had all missing Ion games from 2006 up. Last time i heard, 2003 Force missing games are being added. I assure you, it is not shoehorned.

Hey all! I think I've been living with this problem for years and it never really registered that maybe something was wrong...

So, the full image isn't drawn to my CRT. I'd say in 240p, the bottom 10 lines or so are missing, and this is really weird, but it also stops drawing halfway through the last scanline.

Additionally, I'm guessing this is related, there's maybe an extra one or two scanlines above the top of my screen that are mostly white but changing colors. No pic because I adjusted my CRT to push that off the top and promptly forgot it was happening. But now that I'm actually giving this some thought, it's probably wrapping around and trying to draw the bottom part of the image before the first real scanline.

Is there anything I can do to diagnose and correct this? I am using a consumer 15khz NTSC TV, with VGA → GreenAntz → Component in. My crt_range is basically generic15 with some minor tweaking, but I can try to see if resetting it back to generic15 does anything.

Bottom of my screen in "ninja spirit" - you can see all but the first 3.5 lines of the HUD is missing.


What it's supposed to look like


This is just an example - the bottom appears to be cut off at some point in all progressive 15khz modes (in other words 240p and the surrounding range 220-244p or whatever).

Any ideas? Thank you very much!

The panels are pretty far along, and my bearing for the screen arrived and seems great. I would've liked to document a bit more but it's just such a pain in the ass taking photos, video, living, with all the MDF dust even outside. This is my first time working with MDF, I sure like how it's flat and has nice factory edges though.

Got the kick panel done:


Control panel bottom:


Computer is built:


Worked on the side panels, had an unfortunate mishap ruining my first panel. I've now learned the painters tape CA glue+activator template trick for routing:


Side panels mostly done:


My work area is a mess:


Control panel acrylic came, pixelcade folks laser cut a couple for me with my marquee which is awesome!:


Got the computer outputting RGB to the TV and groovymame setup. Launchbox big box looks surprisingly good even with the stock theme, though I intend to find one more like hyperspin:


Got the sub made up. Realized my blades aren't going to cut it for cutting panels cleanly. I did this first and am now routing every edge after rough cutting. It'll be painted though and I filled it all smooth:


Got my panels routed for t-molding today. I also did a little dado cut in the side panels so that the marquee can just slide in prior to the top panel being installed, then the t-molding will hide that.


Did some test fitment for the mid-speakers being flush mounted.