I replied. 
I think you have this disabled in your opt file. You need it enabled to use the command line.
(cli = command line)
@Duimon I just tried I activated the option in my two .opt files it doesn’t change anything I always have a black screen… it’s hopeless !
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I know it seems that way, but if someone else has it working then there is always hope. Can we see the latest log?
@sanchezmike01 Can I see a log of a successful launch so we can compare them. I’m sure it has something to do with command line syntax. Question… are you also launching a *.cmd as content?
U have to understand, I don’t mind helping out…but I have a wife and 2 small girls and I work from 6am till 9pm 6 days a week…so if I didn’t post up , it’s most likely because I been out at work all day and when I unpacked my nvidia shield, my wife called me to spend time with me…I don’t have the luxury of having tons of free personal time…I wake up at 430 everyday and try to be in bed early to do it all over again the next day…I just can’t load things up and then record and post it on here…sounds easy but when your family hasn’t seen u all day and want to spend time u have to make that executive decision to put the electronics down and be a husband and a father
As far as cmd files, all my mame systems including arcade games are launched via cmd files…even my chds are launched via cmd directly…meaning no zips files or subfolders…all my chds are loose in 1 folder with the cmd files in that same 1 folder…as far as chds and disks, I wrote it all on the cmd file…so it will be something like -flop game name then the location and in the same file -cdrom game name and location…and it loads fine…everything I write on the cmd…like acorn archimedes…it must have a specific bios written down to properly load…I also write diwn any auto boot commands so it can load directly instead of me having to do extra work to get it to load…the only physical part I have to do is press F2 for tape play
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Cool. When you have time I’d like to see a log of a CHD successfully running so I can get a look at how the log shows the command line.
Please, take your time… no one has a deadline here. 
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Good evening friends ! I have very good news 
I started from scratch on my girlfriend’s phone & I did a lot of tests to understand better… here is the summary of these tests
I finally managed to launch the FM Town Marty console with my Flashback game !!! I will detail the procedure so that it can also be useful to other people.
Here is the content of my Flashback.cmd file which allows the launch of the game:
fmtmarty -rp "/storage/emulated/0/RetroArch/system/mame/roms/" -cdrom "/storage/emulated/0/ROMS/Marty/Flashback.chd"
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It is very important to declare the BIOS first on the command line. I tried to declare it in second position it does not work !
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It is very important to respect the case -> example:
/RetroArch/& not/Retroarch/ -
It is necessary to declare the paths in quotes (" ") otherwise it will not work.
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The .cfg .opt .xml files are not necessary I deleted them voluntarily to test it works all the same.
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There is no need to unzip the BIOS just declare the correct path to .zip file
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For Marty console Flashback game in .cue / bin format works as well as .chd format
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It is not necessary to activate the CLI (command line) in the MAME.cfg file it works without.
I also tried another machine that I really like: the TRS-80 Color Computer. Here is the content of the .cmd file that allows the launch of the Donkey King game:
cocoe -rp "/storage/emulated/0/RetroArch/system/mame/roms/" -flop1 "/storage/emulated/0/ROMS/Color Computer/Donkey King.dsk" -autoboot_delay 2 -autoboot_command loadm\"donkey\":exec\n
Now I have a question because the game launches correctly but I remain stuck at a specific place… indeed at this place it is necessary to press the space key on the Color Computer keyboard & on MAME libretro it does not there is no virtual keyboard… how to proceed ?!
Is there a way to have a virtual keyboard on RetroArch ?!
Greetings
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You had a capital “A” in retroarch? 
Yes it’s Android that created this nomination… if not, do you have a solution for a virtual keyboard? Without it I couldn’t run the TRS-80 Color Computer on my phone 
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I don’t believe so. If there was Batocera would have implemented it. For most computer systems it isn’t realistic to play without a keyboard, or even a keyboard and a mouse. Not authentic either.
You may be able to curate a few select games for various systems that only require a joystick.
I’m glad you got this sorted.
Thank you that’s nice I have another question…
I would like to automate the launch of cassette games on the Matra Alice 32. I use the following command:
mame.exe alice32 -autoboot_delay 2 -autoboot_command cload\n -cass "d:\Games\Alice\Galaxion.k7"
The game is loaded but does not start ?! I have to manually launch the tape recorder in MAME’s options by pressing the PLAY button in " Tape Control " (Windows version).
I would like to do it in command line… if it is possible how to proceed ?
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Try “capital” letters on your command… i.e. CLOAD\n and/or surround it by quotes like "cload\n"
The easiest way to automate this is to set mame_write_config = "enabled" and mame_read_config = "enabled" in your alice32.opt.
Once you get it to work you can set mame_write_config = "disabled" and eliminate the autoboot from the command line.
It’s also a quick way to try changes in the autoboot command. You can edit the “system/mame/ini/alice32.ini” instead of changing the command line. (disable the write config first.)
Good luck… autoboot commands can be tricky.
BTW. I always put by autoboot commands last on the command line.
i.e. E:\RetroArch\retroarch.exe -L "E:\RetroArch\cores\mame_libretro.dll" "bbcb -rompath "E:\Temp\bbcb" -flop1 "E:\Temp\bbcb\commando.zip" -autoboot_delay "1" -autoboot_command "*cat\n*exec""!boot\n"
Also…
the Launchbox page I linked to uses the alice90 for the Matra. The autoboot command is… alice90 -skip_gameinfo -autoboot_command "cload\n" -cass
I’ll have to try this system out, it is not on my list, or the Batocera systems list.
It is absolutely necessary that you try this fabulous microcomputer which is the Matra Alice (32 & 90)
I tried the MAME version on Windows in standalone the command you suggest does not work… with or without quotes… the game loads but the cassette player does not start…
I’m looking for a script for the cassette player to start (play touch) & load the game apparently it doesn’t exist ?!
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I’m not sure about that exactly… it is a straight up clone of the TRS-80 MC-10. I will give it a shot though and see if I can get the autoboot to work.
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Sorry yall…I got work work work and more work…u got marty sorted out so that’s gr8…quick question though…can I link videos on this page or do I need to you youtube 1st then add the link that way…I have that Alice system working and I only use android …I can record the system working , then I can go to the cmd I use
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Needs to be on youtube first. (Or another hosting platform.)
Google Drive works, you just have to follow the link to view it.
Ok…ill upload to Drive …also on Android and possibly a cpu…u can’t pass the F2 command to play tape automatically…maybe it’s possible via a lua script, but idk how to do that nor have I ever seen a post of someone that has done that b4
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Ok…that Alice Matra system seems tricky on Android from my experience…and it’s one system like many cpu systems that you WILL need a keyboard…so since all games use the same boot sequence I wrote it on the ini itself and not the cmd file…its basically just cload/n …as u can see in the video the delay was 4 seconds yet it kept typing the wrong word…idk why to be honest…so I had to press F3 to reset several times before it correctly typed cload…then F2 to play the tape…at the prompt a few seconds later you have to type RUN …then more seconds later it will start up…I set it up because it can load and run on Android even though I’ll probably never really play it lol https://drive.google.com/file/d/1FppH7Gc7HKdzzReneuB2YqZSdxuT-PRu/view?usp=drivesdk
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Sorry try again…I changed the permissions to view
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