Really nice tutorial! But got one question:
CodeLayer2Up:
LDA $1468 ; Layer 2 position, next frame.
CMP #$00CF ;\ If layer 2 will go too high, don't raise it.
BCS + ;/
INC $1468 ;
INC $1468 ;
+ SEP #$20 ;
RTS ;
Why "CMP #$00CF" has that fixed value? What is the reason?
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