haha you're using N as your for loop variable (I used ot on the Spectrum too). It should be I ;-) N is normall the top of the range for example 1 to N (in maths). There's nothing wrong with X and Y though...I tend to use W and H for width and Height and SCX and SCY to me might mean the top left coords of the screen (for scrolling).
Making code unmaintainable...
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