Not telling you how to do your program but a few suggestions for other systems  you might want to look into for the new release:

Apple IIGS
Mattel Aquarius
Exelvision EXl100
Texas Instruments TI-99
V-Tech Creatavision

Thank you for the new update, it works like a champ.
You mention that you are working on an update.. Perhaps you can add these systems.
I have them working on mGalaxy with no issues..
Apogee BK
Jupiter Ace
Interton VC-4000
the code and icons files are attached
Again thank you for this wonderful ...

Thank you.

No....Pretty much those games are represented on other systems, so I didn't
want to use up the space.
Oh there are two others I failed to list
Dragon Color Computer and Tandy Coco
both work perfectly , don't know how I missed them.

Here you go mGalaxy, it's is my complete listing of all systems I am currently using...
This is the 103 systems I have in my setup.
94 Work perfectly with mGalaxy
However there are nine (they have an "X" after their name)
that I have to run from either my desktop, or from retroarch.
I do know some ...

I currently have 96 systems in it.
90 run perfectly....
Having trouble with 
Coleco+4
Coleco Adam
Apple II GS
Commodore Pet
Sharp X-1
Camputers Lynx
I can get these to run off desktop, or straight through Retoarch or Mame, but cannot get them to
interface with mGalaxy

Has anybody been able to get these systems working in mGalaxy

via Retroarch
Commodore Pet
Commodore Plus-4
They work from my desktop, but when I add them to mGalaxy they do not come up.
I added the proper core to the emulator file, that I use to bring them up in retroarch, but when I go to play ...

I was able to add the Watara Supervision system to mGalaxy
It runs of of retroarch
Only thing is it will run from Retroarch on the desktop
But if I go to access it from mGalaxy, all I get is "Starting Game" and that is as far as it goes.
I added the system to my emulators, even made sure the core is ...

Wow I am sorry. I see what I did about the double entry on the Electrem emulator..My Bad
I copied and pasted it by itself.
Then when I copied the code for the other acorn systems, I copied the electrem stuff along with the new code
Sorry about that.
As to why the roms are not working, I do not know ...

Had some generous help in getting Atomulator working.
Gentleman gave me step by step instructions.
You can find them here.

https://stardot.org.uk/forums/viewtopic ... 57#p364457

There are three Acorn Systems out there Atom, Electron, and Archimedes
Standard warning can not mention where to find the Roms, Bios, etc,etc
However a very simple Google Search will tell you
I have worked on the code to add to your emulator.xml file.
I will tell you Electron works with no tweaking ...

Thank you Aeliss
I am using the tape option.
I take it you have already got this system to work.
I was going to submit my code  for all three acorn systems.
But if it is out there already, I don't want to muck it up for others.

Okay, I got two out of the three Acorn systems working on mGalaxy.
The only one left is Atomulator for the Acorn atom.

Here is the code I added to emulators.xml
</Emulator>
<Emulator name="Atomulator" hidden="false">
<Systems>
<System name="Acorn Atom" option="" script="true" cmd="-f -g "%path ...

Found the problem. I was using capital letters, and the roms were not being found.
Give me a few days to work out some other issues, and I will upload the code for the Acorn systems.

</Emulator>
<Emulator name="Electrem" hidden="false">
<Systems>
<System name="Acorn Electron" option="" script="true" cmd="-f -g "%path\%file%ext"" extensions="UEF"/>
</Systems>
<Requirement>None</Requirement>
</Emulator>
<Emulator name="Arculator" hidden="false">
<Systems>
<System name ...