Back to the Future MSX2 and emulators

Hmmm. If I extract the DSK contents into a folder, I can read the BASIC files. But the game doesn't start, it locks on a black screen.

Ok... black screen is due to copy protection. And it seems the code to load images from disk are in the same binary as the protection - the game seems to read the images directly from specified sectors, that's why extracting them to a folder won't work.

Doesn't explain why the BASIC files won't load, though.

Have you tried emulating different machines?

Is it a single sided disk but the file is 720KB?
I had some other dsk files that were created by a disktool that didn't correctly handle 360Kb disks. but the first track (first 9 sectors) containg the FAT and directory will be correct, so you can see the data but actually loading will fail in an emulator due to the way it calculates offsets in the dsk file. If you rewrite such an incorrect 360KB disk back to a real floppy with such a faulty tool it will work on a real MSX again...

if you split the dsk in two part you have the original 360k files and it work on BlueMSX
in CPU.OBJ you can see the program use call F37D to read sectors
0e1a ld c,1ah set dma
1100d9 ld de,0d900h
cd7df3 call 0f37dh
ed5b00dc ld de,(0dc00h)
13 inc de
ed5300dc ld (0dc00h),de
1b dec de
0e2f ld c,2fh absolute disk read
210001 ld hl,0100h
cd7df3 call 0f37dh

Thanks GDX for solving this. I've placed a fixed version on my download archive.