throwaway123

So I ended up getting a new ROM set which worked great without issue so the original set I had was likely a bad dump so thank you both for making me realize this, I wouldn't have otherwise. I think its safe to say my problem is fixed, thanks again, I greatly appreciate it!

Tried that, same error message unfortunately. I'm beginning to think that both my BIOS and ROMs are corrupted if that's possible.

1. Outside of Launchbox, MESS doesn't load the console at all and gives me the error attached. As for MAME, the console will load with the cart empty but when I try to load a rom it gives me the same error message. So I'm not sure if the problem lies in my ROM set or the bios itself. 2. I use MESS because of a video tutorial that used MESS to emulate the 5200 and I've used it ever since. I am aware of the merger but I like keeping my Arcade games on MAME and consoles on MESS and the video showed how to obtain a version of MESS that I'm not entirely if you'd called it "old" or "new". This is the video in question: 3. I suspected that as well and I've already retyped numerous times with the same result. 4. All my ROMs are zipped but are in a non-MAME naming format, and they've opened fine on other systems, regardless of that, I do have the boxes unchecked. 5. That is what I speculate the problem to be, however they've opened fine on Retroarch's ProSystem Core and they are all .a78 ROMS. Perhaps they are corrupted in someway but I'm really not sure.

Having issues with getting 7800 games to open on MAME through Launchbox and I simply cannot figure out why. I get the following error message every time I try opening a game through Launchbox in the first image. I'm not sure what it is saying as all my roms are in .a78 format and I've searched online if anybody else has encountered the same error but couldn't find anything else so any explanation of it is appreciated. I'm pretty sure I have the correct bios folder with everything necessary in it in my MAME roms folder as well (a7800), although I'm thinking its a problem with how I have MAME configured on Launchbox. Second image below is my current configuration. r/MAME - Trouble emulating Atari 7800 on MAME I'm thinking by command-line might be incorrect somehow or I just don't have it configured right in general. To be honest I'm not sure, I've been troubleshooting for awhile and I can't figure out why the 7800 specifically isn't working as other consoles like the 5200, Colecovision, and the Vectrex work just fine through my current configuration on Launchbox. I've also tried the MAME fork A7800 with the same steps and configuration but i get the error message "Fatal error device Atari 7800 cartridge slot load failed: unspecified error." Has anybody else run into this error or have an idea why it's happening and how to fix it?