I believe I commented on this before and it was likely deleted. If you care about historical accuracy, I hope you'll leave it. This was one of several 'no logo' intros used by other people after I coded it. While there isn't any 100% concrete proof who wrote it, I'd refer you to the routines that were common in my code: starting with a jsr $e544, inc $d019 instead of lda/sta $d019, using $ab1e for printing of the intro credit after spacebar. The real tell though is the extra gaps in the credit string on this one and the null 0-byte. In my intro, they are perfectly fit, no gaps.

Somewhere out there, there's another 2-scroller where the same thing happened.