Build Your Own Arcade Controls Forum
Software Support => GroovyMAME => Topic started by: nikosrozos on July 31, 2022, 04:49:14 pm
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I recently bought an arcade cabinet OK Baby by Weche. The 29" monitor was made
by Star Vision Cheon Woo Electronics, made in Korea (model SVB-2903) and supports
Standard (15kHz)and Medium (25kHz) according to Highwaygames.
The computer inside has CPU AMD RYZEN 5 2400G 3.90GHZ 4-CORE on an
Asus Prime B450M-K II Motherboard (updated to latest bios Version 3802 2022/05/12).
Arcade monitor connects to pc via J-Pac, with 15kHz and 31kHz jumpers.
Booting in Legacy mode from USB with the latest GroovyArcade (2022.01).
From televison I select 15kHz. Arcade monitor loads GA and reports my card supports low dotclocks.
Selecting Generic 15.7 kHz, installation completes but after rebooting, monitor can't sync
showing distorted image. Pressing enter it loads Robby Rotto with clear, steady screen (it's playable) but with
some obvious horizontal and vertical line doubling. Pressing ESC, monitor returns to garbage.
Here's what I have tried so far
- Selecting Arcade 15.7 kHz - standard resolution.
same as above
- Selecting Arcade 15.7-16.5 kHz - extended resolution.
same as above
- Selecting Generic 15.7 kHz and setting J-Pac to only 15 kHz jumper.
same as above and not even stable screen in Robby Rotto
- Selecting Generic 15.7 kHz and setting J-Pac to pass through (removed jumpers)
after adjusting v-hold and h-hold, I can see attractmode screen (3 times in row)
and Robby Rotto looks darker and must readjust v-hold and h-hold to make it steady
Any help appreciated!!
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I had nothing but trouble with groovyarcade, on 31khz. I think the OS is not well adjusted for that. Once i set it up for 15khz only , it worked just fine. So im gonna follow this just to see if theres a real solution for other resolutions.
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Hi nikosrozos,
The 2400G needs an EDID binary added in the boot options (syslinux.cfg). Its VGA output is a really a DP inside, and the EDID binary stops the kernel from adding undesired modes.
You need to add this to your kernel boot line:
drm.edid_firmware=DP-1:edid/generic_15.bin video=DP-1:e
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Unrelated to your problem,
Do you still have the original power supply for that cab?
I have the same cab and the original PS was stripped out of it before I bought it.
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Hi Calamity,
thanks for your help. When you say "add this to your kernel boot line", I'm assuming,
pressing TAB in boot menu and adding to options "drm.edid_firmware=DP-1:edid/generic_15.bin"
and replacing text after video= with "DP-1:e", like in the picture.
Now gasetup can see both television and arcade monitor.
If I leave the tv connected, it loads attractmode on the tv. Selecting a game, tv goes black and pc sends signal to arcade monitor with clear picture.
If I disconnect the tv, I get garbage on the arcade monitor in attractmode, and clear picture when selecting a game like before.
Hi abispac,
if I set jumper to 15kHz only on J-Pac, I get a darker and not steady picture in gasetup menus.
Hi Mike A,
I am not sure if the power supply is the original. It came connected like that, as shown in the last picture.
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OK let me explain. You're in a niche case : you use DP to get analogue video. I won't go into details of why, but once installed, you need to edit as root /boot/syslinux/syslinux.cfg and append what Calamity suggested at the end of the line starting with "append root="
If you need more technical help, I'll give you a more detailed step by step
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Substring thanks for clarifying. Did what you said and now it's working great!!! :) :)
Again many thanks to Calamity and you!