You will crash almost every DOS and even GameDOS using that memory locations. Page 6 is OK, and for "standard" DOS compatibility better don't use anything till $2000 then with blocks, that have to be loaded.
Didn't looked deeper into this, but imho you can install other emulators with this on the machine - it's an alternate firmware. Adding games direct to the carousel might not work, if I understand release news correct.
Imho the disk drive emulation is not as exact as it would be needed to run this demo. They used own loading routines there, so that the method the emulator in the400 uses won't work.
The400 is not a machine for watching demos. The emulation is not good enough for this and atm you can't set it to be able to see the whole Atari screen. Best example is one of my rather simple intros - Atari 50, a simple one screener with music and scroller. The font has glitches on the400, that are not seen on A8 or Altirra.
Here is a link that might help a bit understanding all the 6502 opcodes: https://www.masswerk.at/6502/6502_instruction_set.html
But better not use that "illegal opcodes", to be sure upgraded machines will execute your code.
.car is clearly supported. Besides the Space Harrier, I started ATARI Tennis and ATARI Blast! without any problem.
If the ROMs are for the 5200 you should check the 5200 option. This machine has different internal structure from all the other A8 machines, The400 mini supports.
btw: Stunt Car Racer (.atr) and Crownland (.xex) are working fine, too 👍
Ah, I see, you found a working version.
Just to make it clear for everyone. This pic was taken using the same atr, I used before, but I started a 3 player game to be sure emulation is fine...
Here a screenshot from usb loaded M.U.L.E.:
Problem is really just a wrong image of the game.
I really can't understand how such a mistake can happen... Is there no one who takes control, if everything is correct?