Hello, Multicart noob here.
I received my cart some time back and just now getting around to trying it out.
Could you please direct me toward some help, I've read the pages that came with the cart and did a bit of googling but I'm unclear on what I'm doing incorrectly.
--put some ATR files in folders and they don't show up.
--put some XEX files in folders and I can select from them. When I select any item, it goes to a blue screen rather than start the game.
--I am familar with using Atari 8-bit emulators from Raspberry Pi, so I know I have working files.
What am I doing incorrectly?
So, let's take this step by step:
1. Amongst the papers included in the box, there should have been a manual which lists all of the types of files that can be opened on the Ultimate Cart. This will help you in your quest.
2. The reason you do not see the ATR files is because ATR files do not work on the Ultimate. You need its little brother, the UNO, to run those. However, the UNO does not run on the 400/800 and will not run larger files.
3. The primary use for the Ultimate cart is ROM & CAR files. The XEX loader works very well, but some XEX files do not "play by the rules" so some of them might not run. However, I cannot imagine there being too many of them that do that. I do have some files on the BBS (or you can go to AtariMania as well) or even root around here for XEX files that work fine. Check the list of file types in the manual to see which work. Also, ALWAYS keep in mind that the computer you are running the Ultimate on needs to have the capabilities to run the file in the first place (RAM, correct OS, PAL/NTSC, etc).
4. Remember, that this is a Multi-CARTRIDGE, it's primary use in life is to load cartridge files through the cartridge port. Although the firmware is very robust and able to load XEX files as well, those files are still running through the cartridge port. Most can do that without a problem, but some are persnickety.
Hope this helps. Let me know if I can answer any more questions.