There is a detailed guide here, make sure to change the base preset to a ntsc variety. (Read this guide for info on changing the base if the instructions in the preset comments aren’t clear enough.)
FYI those params files don’t add anything to the shader, they are just tweaks to existing parameters.
My thanks again to @ProfessorBraun for sharing them.
I’ve been messing around with your Mega Bezel shaders again and I had a question regarding zooming in on the gaming area. I messed around in the Shader Parameters and I noticed that there are 2 options that appear to do the same thing and wasn’t sure if one was better than the other. They are “Non-Integer Scale Offset” and “Non-Integer Scale Percent”. Both of those options zoom in when I increase both. I ultimately wound up using the “Offset” one and everything appears to work well. Just wanted to touch base with you and see if that is the appropriate way for me to achieve what I am looking for. (Below is what your Game Boy shader looks like when zoomed in).
Secondly, I tried doing the same thing on your PSP shader, but when I zoomed in on that screen, these horizontal lines across the screen kept getting thicker and thicker at a faster rate than what I was zooming in at. I hope that makes sense. (See the before and after I zoom on PSP to see what I mean).
I appreciate any advice you can give. Thank you.
Edit: So I think I figured out what was happening on the PSP shader. I forgot that your shaders are designed for 4k monitors. I mainly play on my 4k TV, but it was in use, so I was making these changes and testing on my laptop which is 1080p. When I connected my laptop back to my TV and looked at the PSP shader, things looked much better. But my original question of zooming in still applies. Thank you.
This is generally the one you want to use. I’m not exactly sure why they are both in there. 
Is there a way to get this on retrobat? I only need the dreamcast Vmu to complete my set. Downloaded a few sets and none look like this. Looks brilliant 
Looks brilliant. Is there a way to get this to retrobat?
You’ll have to do some RetroBat research. It should be fairly easy since it can be done on Batocera.
Essentially, you should be able to (If it’s Mega Bezel presets you are referring to.) disable any shader sets and use my standard RetroArch install instructions. (Double check the shader path in the RA settings.)
Then just load a game in a core, browse to a preset, load it, and save a core, game, or content directory preset.
disable any shader sets
If RetroBat is as much like Batocera as I suspect, then any chosen shader sets will override the RetroArch settings.
BTW. I am fairly certain that RetroBat has my Mega Bezel presets in the content downloader but using it will prevent you from saving any custom changes to your loaded presets.
You will be able to find some doc here 
https://wiki.retrobat.org/advanced-features/decorations-and-bezels
Hello Duimon, Is it still possible to suggest new Mega Bezels ? I am currently setting up Hyperspin wheels for the NEC computers PC-8001 and 6001 and I don’t think you have done them already or have them in your to-do list. I don’t know if they are relevant and if you can find quality graphic materials. The 8001 was sold with a small NEC monitor it seems. The 6001 was not but could use the same monitor I think.
The PC-8001 works flawlessly in Retroarch with the Quasi88 core and the Mame core plays a few 6001 games.
Thanks for everything you’re doing, your work is amazing !!!
It sure is, although I cannot promise any ETA, I fully plan on creating a bunch more.
While I think my PC-8801 covers the first, the 6001 and/or 6001A looks interesting.
Thanks for the request! 
Hello Duimon, Thanks for the quick answer !
I’m glad to see you are still in for new stuff 
I am currently using the 8801 bezel but I still think the PC-8001, who was created in 1979, would deserve it’s own bezel compared to the PC-8801 from 1981.
Something with this monitor, for example, would be awesome:
But it’s up to you to decide if it’s worthy and possible or not !
Thanks again, I will never say enough how I love your work. I use Retroarch everytime I can now, because of your Mega Bezels.
I did some R&D and what I thought was the CPU was actually an external floppy.
Since it is a “Keyboard” computer I agree with you.
I would suggest the PC-8043 monitor though…
…the one you suggested is a character only display.
I have updated my to do list with the PC-8001, the PC-6001 was already on the MAME list.
As a refresher, this is the list of systems I plan on doing in the future. (From the second post in this thread.)
There are a couple of new cores and Software lists that still need to be added, I will add them when I get a chance.
Thanks again for your input! 
This is fun!
An “ancient” DOS emulator for the original Magnavox Odyssey “PONG” console, running in DOSBox Pure.
You’re welcome,
I’m glad I could help a little.
Great R&D by the way, I had no idea about the different NEC Monitors 
Your to-do list is impressive. I have all those systems in my Hyperspin setup, running in Retroarch so no need to say how grateful I will be when you can work on them (and there is no rush, I understand how time consuming it must be !)
I suppose your are using odyemu right ? Always fun to run an emu through an emu ! The Dosbox bezel is beautiful !!
You are correct.
This system (The Odyssey) holds more nostalgia than most. Nintendo’s first foray into the gaming console world was as a third-party retailer for the Odyssey in Japan.
That is true, but the real holdup is that I want to increase my Vintage TV preset collection first.
There are many users who prefer a TV preset over a console themed preset, and I would like to reach as many users as I can. (They are also just really fun to make. )
I also love those vintage TV’s. Could be good for the Odyssey too !
One thing on my internal to do list is to create monitor only presets (i.e. table and wallpaper backgrounds etc.) of all the custom monitors that I have in my Mega Bezel presets.
Great project, that would be awesome !
How do I set this up? I am able to run odyemu in DOSBOX, but how do I load a game?
You need to create a BAT file that runs a command line at the virtual DOS prompt.
Here is an example of a file followed by the contents.
ODYEMU TENNIS.MO1
Then you load the BAT file as content in the core.
The command line instructions are in the ODYEMU.TXT file included with the emulator.
When I get a chance, I’ll create a zip file to run as content that contains a menu to select a game.
