Pulling together the (very basic) start screen for Joystick / Keyboard selection, I stumbled across some weird crash/hard reset but in the Next KS2. I tried to reproduce it separately from the main game, but no luck.
It seemed to be when changing from Layer 2,1 to Layer 0 and clearing the screen / sprites, but it also seems to move around when I add and remove lines of code in the start screen.
Even more strange, it may do it once, and reset the machine, then when you re-load the .bas file and run it, its ok. Other times it may do it twice in a row.
Not sure what's going on but probably related to the memory banks for sprites, the music and the sound effects perhaps not playing nicely.
I just need to sort the high score table, and then I can release a v1 (hopefully without the crash bug, but once the game is running, it's stable).
More soon....