These are the best recommendations to configure the video to fit your screen the right way. There are three levels of configuration : system, default emulator video mode, emulator specific video mode. Keep in mind that the screen resolution can have quite an impact on the frame rate, especially with CPU intensive emulators i.e. (N64, PSX & others)
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Most of this guide will concentrate on the HDMI output, and outlining as often as possible the 3 cases of pure HDMI, HDMI2DVI, HDMI2VGA.
First, understand the basics of screen resolution : a number of pixels in width by the number of pixels in height at (@) a given refresh rate in Hertz. For example : 1280x1024@60 which is a common screen resolution of 4x3 19' monitors. Nowadays TVs all display full HD at 1080p as an example, like 1920x1080@60. We won't go through interleave or progressive modes, that's off topic. Please refer to your screen manufacturers manual to know it's native resolution.
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There are 2 groups of video modes : CEA and DMT. All those modes are listed here or here. Make sure to check the mode is compatible with your native screen resolution. A simple rule of thumb : CEA are TV modes, DMT are all other modes.
Most common modes are :
Chrono Cross Widescreen
In this tutorial we will cover 3 cases :
With what you already know about screen modes, these settings are most common :
Upon boot, the Pi will ask your monitor it's preferred screen resolution. Your monitor send its EDID and the raspberry will select the screen resolution noted as 'preferred'. Here is where the very first problem occurs :
Now that you know a bit more of what can happen, here are some examples :
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As the screen detected on boot is the one displaying EmulationStation with its preferred resolution, 720pVGA will get an awful display. Hopefully this can be tweaked by editing the
/boot/config.txt . Here are the lines you want to edit :
hdmi_group : 1 for CEA, 2 for DMT
hdmi_mode : refer to the links aboveso, for our 720pVGA, this is how we edit
/boot/config.txt :
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Now we're done, our 3 screens are set, continuing onward!
Now EmulationStation runs in fullscreen, your hand is thrilling to test a game ..The main thing you need to know here, is that the screen resolution is changed before launching an emulator. But to what resolution ? Check your
recalbox.conf and read the global.videomode parameter. It's default value is CEA 4 HDMI . That means that the screen resolution will be changed to 720p right before starting the emulator. Time to check some examples :
Ps1 Classic Resolution
Pro tip : Feeling lucky, do you want to spare your monitor from one screen resolution change? Then set
global.videomode=default , recalbox won't change the screen resolution before launching an emulator. But beware : it can have a massive impact on performance. Stretching a picture from the native emulator resolution to 1080p can be quite CPU intensive and slow down emulation. I don't recommend setting to default if your monitor can display higher than CEA 4
Last but not least, the video mode can be set especially for whichever emulator you want. For example, if you read through
recalbox.conf , you will notice n64.videomode=DMT 4 HDMI which means we override the global.videomode for N64 emulation.
I hope this guide helped you to understand how screen resolution is managed on the Pi and Recalbox. Feel free to ask your questions on the forum or IRC
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Hi guys
I hope someone can help. I have RetroPie 3.8.1 running on a Raspberry Pi 3 Model B and I've just loaded the PSX emu (lr-pcsx-rearmed) for the first time. Everything is working great but the default graphics options are horrible, everything is low res, low quality, grainy and pixelated. What are the best settings for this emu on a HDTV and how do I adjust them?
I have PSX emulators on other systems and they look exactly how I would expect, so I'm sure there must be a way of improving the experience on the Pi.
Any advice would be greatly appreciated.
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