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Hello, Lordmonkus recommended I post this here from the reddit thread in order to troubleshoot this further: I used to have a TI-99/4A system when I was growing up along with several cartridge games. Previously I used classic99 to run these, but found out that MESS and MAME worked with it as well. I've been getting emulators set up with Launchbox, but I'm having a tough time with this particular one. Eventually I'd like to get it working with Retroarch if possible, but for now I'm working with standalone MAME first. Mame64 location: W:\Arcade\mame64\mame64.exe TI-99/4A rom folder: W:\Arcade\mame64\roms\ti99_4a.zip TI-99/4A cart folder (example: Parsec): W:\Arcade\mame64\cart\Parsec.zip mame.ini rompath line has been edited with the following: rompath roms;consoles;cart;W:\Arcade\mame64\roms When I open a command prompt, I first navigate to the W:\Arcade\mame64 directory. I then type in the following line to launch the game: mame64.exe ti99_4a -cart parsec After confirming the command line worked, my next step was to try and get this imported into Launchbox. I go to Tools->Import->ROM Files... After selecting the zip file for Parsec and selecting Texas Instruments TI 99/4A for the platform, I'm then asked to select an emulator. I decided to create a new one and just call it MAMETI99. This is what the Emulator Details tab looks like (see attached screenshot): Emulator Name: MAMETI99 Emulator Application Path: ..\Arcade\mame64\mame64.exe Default Command-Line Parameters: ti99_4a -cart None of the checkboxes are checkmarked. Sample Command: mame64.exe ti99_4a -cart "FULL\PATH\TO\ROM\FILE" The Associated Platforms tab only shows one associated platform: Texas Instruments TI 99/4A and it is checkmarked as the Default Emulator (see attached screenshot). On the next screen I choose to "Use the files in their current location" and then click next for the rest of the screens leaving them to their defaults. When I try launching Parsec, Launchbox shows the game loading screen but the emulator itself never loads before the process closes and I return to the Launchbox menu. Thinking that it might be the rompath that was the issue, I then checkmarked the following in Emulator Details: - Don't use quotes (primarily for Project64 1.6 and lower) - Use file name only without file extension or folder path (Sega Model 2 Emulator, etc. compatibility) Which changed the Sample Command to: mame64.exe ti99_4a -cart File However, the issue is persisting. One thing I did notice is in the command line method, I can't use "W:\Arcade\mame64\mame64.exe" on the root of the W:\ drive in the command prompt otherwise it complains "Fatal error: Required files are missing". Is there a way to get the TI-99/4A configuration with MAME working on Launchbox?