NG64 in a jamma cab... why won't it work?

ForeverSublime

ForeverSublime

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I just got back from EvilMike's place and a swingin night of neo with chainsawyak and co. We fired up his cab with a hyper board in it, and the screen just rolled. What would cause this? I thought the board would work on any jamma harness... it works on our Super Nova. I was thinking there could have been a problem with the voltage, as I know that causes the picture to roll on NTSC screens when you attempt to play a PAL game. Would this be a correct assumption? I didn't want to go fiddling with the man's cab as it was the first day we'd met.

[ August 05, 2002: Message edited by: ForeverSublime ]</p>
 
RATM

RATM

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I'm pretty sure that the Hyper64 is compatible with Jamma and MVS harnesses. Perhaps you should check the voltage on the power supply, sometimes just changing it a little bit can get certain jamma boards to function correctly.
 
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Andy Geezer

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Some arcade monitors do not like interlaced video signals (The Hyper NG64 is 640x480 interlaced).

You might need to adjust your v-hold if you haven't already done that.. just make sure your monitor handles interlaced (otherwise the picture will not look as good).
 
J

JHendrix

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Originally posted by Andy Geezer:
<strong>Some arcade monitors do not like interlaced video signals (The Hyper NG64 is 640x480 interlaced).

You might need to adjust your v-hold if you haven't already done that.. just make sure your monitor handles interlaced (otherwise the picture will not look as good).</strong><hr></blockquote>

The hyper is 640x480? No way, that's high res as far as arcade monitors are concerned. I've seen a Hyper work on a MVS/JAMMA cab at Rev's get together. And those monitors are standard Arcade ones running at 15.75kHz meaning about 320x240 resolution standard.

But as for getting the board to work right, just make sure you have the volatages right and that the video sync is hooked up. You may have to adjust the monitor's v-hold or some other aspect.

Peace

JHendrix
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C

Caris Nautilus

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Hyper is standard res, and standard jamma, even the 4th button is the same as MVS.

Maybe a wiring problem? Maybe you have a board that needs the psceial power supply?
 
G

Galford Forever

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I don't know if this pertains to your board in patricular, but I know there are some version of the Hyper 64 that are not directly JAMMA compatible and require an extra voltage line. Ask RevQuixo. He knows much more about this than I.
 
Mystery

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JHendrix: So you want to tell me that the HyperNeoGeo64 has the same resolution as the MVS? Yeah...sure!
The MVS uses low-res (320x240 or something like that) and the Hyper uses mid/standard-res. Don't know the exact resolution but it should be close to 640x480.
Just look at SSWRs select screen and compare it to any MVS game-scene of your choice...do you really want to tell me that it's the same resolution?
 
Tacitus

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Speaking from experience with Jamma Boards...

Adjust the V-Hold in the back...My UMK3 board for some reason doesn't like the settings that most of my other boards do. It does EXACTLY the same thing as you described.... A few twists of the knobs on the back of the monitor should do the trick.

One thing, MAKE SURE IT'S UNPLUGGED FIRST.
 
A

Andy Geezer

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The Hyper is 640x480 it runs at 15.75khz and the picture is interlaced.

It uses the same picture technique as used by the Dreamcast and Arcade boards like Ridge Racer.

To get the best out of the Hyper 64 you need a fairly modern Arcade monitor like Nanao (as used in NeoGeo sit-downs), Older monitors will work, but the picture won't be so good.
 
J

JHendrix

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I was of the opinion that if the monitor was only 15.75kHz that it couldn't do 640x480 resolution. I'm actually VERY happy to be wrong though...

So you can have a 640x480 picture on a normal monitor though, this is useful. But what does interlaced mean, I'm not too sure. But I would like to know what it would do to a normal 640x480 signal if I made it interlaced, is that where every other vertical line is missing?

Peace

JHendrix
 
ForeverSublime

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Thanks guys. I had tried working with the vhold while I was there (we had to adjust it when we played MVS games), but it did not work for the hyper. I think a slight change in voltage may be needed to solve this one. Thanks again.
 
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Andy Geezer

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In order to "interlace" the television picture, the electron beams draw all of the odd numbered lines of a frame first, then goes back and draws the even numbered lines. This doubles the "refresh rate" to 60 times a second, which is fast enough to eliminate flicker and does not require a higher bandwidth signal (31.5khz).

Not all older Arcade monitors support interlacing method (all TVs do), so basically the odd/even frames sit on each other (so the picture resolution is halved 640x240). Please remember the signal while still 640x480 is at 15.75khz, VGA 640x480 is at 31.5khz and isn't interlaced.

If you look closely when the screen is white, or contains lots of white, it will slightly flicker (depends how good your eyes are at handling Hz).

I hope that clears things up.
 
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Blaine

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Another cool way to pick up the interlacing is by watching a picture of a TV on a TV and you'll see it not fully in sync, you'll get moving bands of brightness.

You can also get something similar to this with one of those handheld fans, hold it up in front of your face and watch tv, if you tilt it correctly you'll break up the optical illusion of a solid picture you normally see.
 
Poison Sama

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Perhaps the initial resolution is 640x480, but is later compressed in order to display it on a TV/Monitor.
I think some Computer video hardware with video outputs use this technique...But, since this is not my area of expertice, I could be wrong.

Something like this may have been mentioned before.
Sorry if its a repeat.
 
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Andy Geezer

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The Hyper NeoGeo is 640x480 in game also, trust me I know my video stuff, especially seeing as I have done many things in the emulation scene to get Arcade monitor support in MAME.. :p
 
ForeverSublime

ForeverSublime

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More help needed. I still didn't want to mess with the man's voltage setting...

I tried putting in an ST-V board, and it had the same effect the Hyper did. Why so? This was a non-neo cab originally...
 
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Andy Geezer

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You need to adjust the v-hold settings on your monitor, the game before was probably Mortal Kombat or something that used a different vertical sync rate.
 
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