I ran into a few issues with the following Port cores. Some of these problems weren't well documented. So I decided to share the workarounds or solutions to the issues I came across. Hope it helps you use these cores too.

Doom:

The PrBoom core supports the common Doom and Doom 2 wads. I ran into issues running Sigil. The problem was caused by the doom2.wad being in the same directory as the doomu.wad (which is required to run Sigil). To overcome this issue, you need to modify the prboom.cfg file in the doomu save folder (saves/doom/doomu/). In the ## Files section, change #wadfile_1 to wadfile_1 "sigil.wad". This will also load the Sigil wad when you start Ultimate Doom. Run the .wad file to launch the game.

File structure:

roms/ports/Doom/
	doom2.wad (Doom 2)
	doomu.wad (Ultimate Doom)
	masterlevels.wad (DOOM 2: Master Levels)
	plutonia.wad (Final Doom: Plutonia Experiment)
	sigil.wad (Sigil)
	tnt.wad (Final Doom: TNT - Evilution)

Wolfenstein 3D:

The ECWolf core supports the main game (wl6), Spear of Destiny (sod) and two mission packs (sd2, sd3). I ran into issues running the Spear of Destiny mission packs (sd2, sd3). It ended up being a file extension issue. If your game files don't match the file extensions stated below, change them so they do match. Run the .exe file to launch the game.

File structure:

roms/ports/Wolfenstein 3D/
	wl6/ (Main game)
		[multiple game files].WL6 (Must have the .WL6 file extension)
		WOLF3D.EXE
	sod/ (Spear of Destiny)
		[multiple game files].SOD (Must have the .SOD file extension)
		SPEAR.EXE
	sd2/ (Return to Danger)
		[multiple game files].SOD (Must have the .SOD file extension)
		RETURN.EXE
	sd3/ (Ultimate Challenge)
		[multiple game files].SOD (Must have the .SOD file extension)
		ULTIMATE.EXE

Quake:

The TyrQuake core only supports the main game and two expansion packs (id1, hipnotic, rogue). I tried running two other expansion packs (dopa, mg1) without success. In the id1 folder, delete the pak0.pak (shareware) file. I renamed the pak1.pak (registered) file to pak0.pak for consistency. If more than one pak file is included, the game entry will disappear from the game list. Run the .pak file to launch the game.

File structure:

roms/ports/Quake/
	id1/ (Main game)
		music/
		pak0.pak (Registered pak/only include this pak file!)
	hipnotic/ (Scourge of Armagon)
		music/
		pak0.pak
	rogue/ (Dissolution of Eternity)
		music/
		pak0.pak

Quake 2:

The VitaQuake2 core only supports the main game (baseq2). Each expansion requires a separate VitaQuake2 core that is not currently included. In the baseq2 folder, only include the pak0.pak file. If more than one pak file (pak1.pak, pak2.pak, pak3.pak) is included, the game entry will disappear from the game list. Run the .pak file to launch the game.

File structure:

roms/ports/Quake 2/
	baseq2/ (Main game)
		music/
		players/
		video/
		pak0.pak (Only include this pak file!)

@rummy1 Ok, I finally figured out how to run this on recalbox! It's took a lot to get it work but here goes. First create a folder, I named my dagger.pc. In the dagger.pc folder create a new folder named DAGGER, this where you will copy all the game files. You will also need a dosbox.bat for run the game. To create the dosbox.bat file, I'm assuming you are using a mac so you would use TextEdit program to create a text file. In this text file, copy this code:

c:
cd DAGGER
FALL.EXE Z.CFG

Save this file as dosbox.bat, you might need to remove the file extension at the end if it saves as dosbox.bat.txt. You will also need the dosbox.cfg, you can copy the code for this file from the following link: https://pastebin.com/13xrJdkw. Using TextEdit, you'll need to change the line that says mapperfile= to mapperfile=dagger. Also, the only way this would game would run was to increase the memsize= to memsize=48.
You'll need to edit the Z.CFG file too. Using TextEdit, edit the second line: path and the third line: pathCD to read like this:

path C:\DAGGER\arena2\
pathCD C:\DAGGER\arena2\

Out of all the dos games I've gotten to run on dosbox this one is the most complicated. I'm pretty sure there are many different ways to run the game. This is just one way that worked for me.

If this driver can be implemented with most emulators, the extra performance would be amazing. https://github.com/Yours3lf/rpi-vk-driver

If you want to play DOS games, use this guide: https://recalbox.gitbook.io/documentation/emulators/computosaures/dosbox

I ran into a few issues with the following Port cores. Some of these problems weren't well documented. So I decided to share the workarounds or solutions to the issues I came across. Hope it helps you use these cores too.

Doom:

The PrBoom core supports the common Doom and Doom 2 wads. I ran into issues running Sigil. The problem was caused by the doom2.wad being in the same directory as the doomu.wad (which is required to run Sigil). To overcome this issue, you need to modify the prboom.cfg file in the doomu save folder (saves/doom/doomu/). In the ## Files section, change #wadfile_1 to wadfile_1 "sigil.wad". This will also load the Sigil wad when you start Ultimate Doom. Run the .wad file to launch the game.

File structure:

roms/ports/Doom/
	doom2.wad (Doom 2)
	doomu.wad (Ultimate Doom)
	masterlevels.wad (DOOM 2: Master Levels)
	plutonia.wad (Final Doom: Plutonia Experiment)
	sigil.wad (Sigil)
	tnt.wad (Final Doom: TNT - Evilution)

Wolfenstein 3D:

The ECWolf core supports the main game (wl6), Spear of Destiny (sod) and two mission packs (sd2, sd3). I ran into issues running the Spear of Destiny mission packs (sd2, sd3). It ended up being a file extension issue. If your game files don't match the file extensions stated below, change them so they do match. Run the .exe file to launch the game.

File structure:

roms/ports/Wolfenstein 3D/
	wl6/ (Main game)
		[multiple game files].WL6 (Must have the .WL6 file extension)
		WOLF3D.EXE
	sod/ (Spear of Destiny)
		[multiple game files].SOD (Must have the .SOD file extension)
		SPEAR.EXE
	sd2/ (Return to Danger)
		[multiple game files].SOD (Must have the .SOD file extension)
		RETURN.EXE
	sd3/ (Ultimate Challenge)
		[multiple game files].SOD (Must have the .SOD file extension)
		ULTIMATE.EXE

Quake:

The TyrQuake core only supports the main game and two expansion packs (id1, hipnotic, rogue). I tried running two other expansion packs (dopa, mg1) without success. In the id1 folder, delete the pak0.pak (shareware) file. I renamed the pak1.pak (registered) file to pak0.pak for consistency. If more than one pak file is included, the game entry will disappear from the game list. Run the .pak file to launch the game.

File structure:

roms/ports/Quake/
	id1/ (Main game)
		music/
		pak0.pak (Registered pak/only include this pak file!)
	hipnotic/ (Scourge of Armagon)
		music/
		pak0.pak
	rogue/ (Dissolution of Eternity)
		music/
		pak0.pak

Quake 2:

The VitaQuake2 core only supports the main game (baseq2). Each expansion requires a separate VitaQuake2 core that is not currently included. In the baseq2 folder, only include the pak0.pak file. If more than one pak file (pak1.pak, pak2.pak, pak3.pak) is included, the game entry will disappear from the game list. Run the .pak file to launch the game.

File structure:

roms/ports/Quake 2/
	baseq2/ (Main game)
		music/
		players/
		video/
		pak0.pak (Only include this pak file!)

If you want to play DOS games, use this guide: https://recalbox.gitbook.io/documentation/emulators/computosaures/dosbox

Dosbox was one of the emulators that challenged me and got me excited about emulation in Recalbox. Unfortunately, progress on the emulator has been somewhat stagnate for a while. I know there are many variants of Dosbox, so recently I have been experimenting with the stable build of dosbox-staging 0.75.0 and have been very impressed. You can read and learn about all the new/improved features of the emulator at https://dosbox-staging.github.io/v0-75-0/. There are so many new features, it is exciting to see that development continues in the dosbox scene. What do you all think? Have you tried the emulator?

If this driver can be implemented with most emulators, the extra performance would be amazing. https://github.com/Yours3lf/rpi-vk-driver

Amazing work! Thank you!

@Chunter Thank you for the suggestion. Just before I was going to try your suggestion, I was able to successfully boot to the main menu. It's working normally now. I'm assuming I might have a sd card that is failing so I have backed up everything. I'll be buying a new sd card and using an external usd drive for all the roms.

I was apply to create a support archive: https://www115.zippyshare.com/v/TZZwO4mD/file.html

Hi everybody,
During quarantine I've been doing much needed work on my Recalbox. I've been using 6.1.1 since it got released without any issue and using an overclocked Rpi 3B, also without any issue. The problem happened after I had just finished adding games to ScummVM and ResidualVM. I had my computer connected to the Recalbox using SSH so I could modify the ScummVM configuration file and the gamelist. After I restarted the Recalbox using the menu, its gotten stuck at the splash screen just before the main menu.
I can access the terminal. I just don't know any commands I can use to determine what is happening, or how to create an error report.
Any help would be greatly appreciated!

@rummy1 Ok, I finally figured out how to run this on recalbox! It's took a lot to get it work but here goes. First create a folder, I named my dagger.pc. In the dagger.pc folder create a new folder named DAGGER, this where you will copy all the game files. You will also need a dosbox.bat for run the game. To create the dosbox.bat file, I'm assuming you are using a mac so you would use TextEdit program to create a text file. In this text file, copy this code:

c:
cd DAGGER
FALL.EXE Z.CFG

Save this file as dosbox.bat, you might need to remove the file extension at the end if it saves as dosbox.bat.txt. You will also need the dosbox.cfg, you can copy the code for this file from the following link: https://pastebin.com/13xrJdkw. Using TextEdit, you'll need to change the line that says mapperfile= to mapperfile=dagger. Also, the only way this would game would run was to increase the memsize= to memsize=48.
You'll need to edit the Z.CFG file too. Using TextEdit, edit the second line: path and the third line: pathCD to read like this:

path C:\DAGGER\arena2\
pathCD C:\DAGGER\arena2\

Out of all the dos games I've gotten to run on dosbox this one is the most complicated. I'm pretty sure there are many different ways to run the game. This is just one way that worked for me.

@voljega From my understanding, the game is looking for the disc in the cd-rom drive. So that is why the DFCD directory is needed as well as the -label Daggerfall. I haven't been able to figure out how to make recalbox work when mounting a secondary directory like this.
I've tried the following:
imgmount d "c:\DFCD\dagger.iso" -t iso -fs iso -label Daggerfall

cd DISK\DAGGER
But this gave me an error that I had inserted the wrong CD. The only thing I can think of causing this is that it doesn't like the label I used when I created the iso. I've gotten a few other games too work this way except I haven't had to specify the -label before. When I created the iso the label had to be in all uppercase: DAGGERFALL.