BiFrost Multicolour engine.

[einar]

is it still randomize usr 32768?

Yes.

the game doesnt start when I load the tape anymore

I just compiled and executed your latest program above using all files from "BIFROSTENGINEV1.2L_BorielZXBasicInterface.zip" and it worked as expected. It shows weird images in the multicolor area, but it's just because the tile images data you declared are not a real image.

Then I repeated all this process using "BIFROSTENGINEV1.2H_BorielZXBasicInterface.zip" and the result was exactly the same.

Perhaps you are compiling your program with one version but trying to run it using another?