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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Sun Apr 29, 2018 10:31 pm

Hello everyone.
Before writing, I clarify that I do not buy any kit, I assembled it on my own, buying the resistances and mounting it on a protoboard.
Everything works perfect, except that gradients look weird.
The pure colors look perfect, when combining colors it looks like saturated, I attach images so that you understand what I'm talking about: https://imgur.com/a/pUodiQb.
I am using resistances of 5% tolerance, and I read in the manual that the 500 Ohms should be as close as possible, in this case I am using 470 Ohms, this interferes? Somebody could help me? I would appreciate it very much, greetings!

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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Wed May 02, 2018 6:38 pm

I'm not sure what you mean by "gradients look weird", and your picture doesn't help me.

However, if you use non-ideal resistor values then, on a ramp from black to full red/green/blue, the 63 steps won't be identical in size.

The ideal resistor value should be 500R and Gert recommends 1%. That means anywhere from 495R to 505R
470R is 6% low, and so a 5% resistor could be 11% low (though may not be). However, you could add a 30R resistor in series if you want to be more accurate.

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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Fri Sep 14, 2018 8:08 am

Is compatible Gert VGA 666 adapter with the last model Raspeberry Pi 3b+? Can I use this adapter to manage 320x240 resolution? Can I use this adapter in O.S as Lakka, Recalbox or Retropie?


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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Wed Jan 16, 2019 4:48 pm


i assembled and played with gert666 allmost from the beggining. So i remember that then you had to also change bt-blob but as it progressed all you had to do is add couple of lines to config.txt.

Yesterday i started playing with it again and it doesnt work. I used 2 different gert666 connectors that on old version work and i did exacly as it sais in the how to on the first post. What i want to know is, has support for gert666 been removed from new raspbian (2018-11-13-raspbian-stretch-full.zip)? Can anybody try the new version just to see that its not only me. And if anybody could point me to the last version of raspbian that works.

Thank you very much :)

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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Fri Feb 22, 2019 8:32 am

Got this successfully working as a second monitor but now I have the problem with the vga cable, everything has fuzzy lines over the screen, I have one cable that is 95% okay. So has anyone bought a good vga cable that they can link?

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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Wed Feb 27, 2019 9:34 pm

Having difficulty getting this working on a Raspberry Pi3B+.

My goal is to be able to use both HDMI out & Gert666 (vga) to display two different images simultaneously.

So far I have confirmed the GERT666 works independent from the HDMI output & vice versa, I simply cannot get them to work simultaneously together to display two different images or even the same image at the same time. Does anyone see anything obvious with the below settings ?! Again my HDMI out works fine / cable is fine / monitor is fine. The gert666 adapter works, the cable is fine, the 2nd monitor is fine.. I simply can't get them to work together.

These are my settings in Config.txt :

#Gert's VGA666

#Monitor Number 2

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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Thu Feb 28, 2019 9:59 am

This is not surprising as supporting 2 monitors simultaneously (e.g extending your desktop as in Windows) is not supported readily out of the box.
There are a few programs that can be forced to use an alternative display (IIRC omxplayer, for example) but it is not many.

However, JamesH started creating some new firmware to facilitate this dual monitor function and is making good progress.
Please hop over to his thread here -> https://www.raspberrypi.org/forums/view ... 3&t=213854

Concerning your config.txt settings, the comments suggest that you expect the 2 sections to control 2 different monitors: VGA666 and "monitor number 2". However, the "monitor number 2" settings are also all related to the VGA666 adaptor, because they are for the dpi interface.

If you want to configure the hdmi settings, you need to additionally use hdmi_group and hdmi_mode.
PINN - NOOBS with the extras... https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=142574

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Re: STICKY: Using a Gert VGA 666 adapter - [HOWTO]

Sat Mar 02, 2019 7:10 pm

I am trying to get the right dpi timings for a domestic widescreen CRT 16:9 PAL TV.
Using a variant of VGA666 called Pi2SCART from Arcade Forge
So far have managed to get it working using this:


hdmi_timings 320 1 20 29 35 224 1 10 14 16 0 0 0 50 0 6400000 1


It's OK but...
Guess it is fine for 240p retro gaming but I want to watch movies in OSMC
The resolution is not enough for reading text menus and the video quality is too pixelated.

Ideally I need PAL 576i but I was told Interlaced is not supported on the GPIO's....?

I would just settle for full 576p.... or even 480p
PAL widescreen might be 1024x576 but it is confusing because of stretch pixels or something.
I tried changing the numbers but only get crazy, wavy lines I don't understand the dark art of CRT blanking frames.

Tried most of the #preset timing in the forum guides but had no luck except the one above

Help much apreciated

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