I like this, it's very well explained
But to make it simpler,
When you use

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If T
T--
Pt-On()
Endto check if the space is not a zero, you could instead delete that loop and instead define Pic1 as

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[0000000000000000]->Pic1
[FFFFFFFFFFFFFFFF]
[F0F0F0F0F0F0F0F0]so it's just

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Pt-On()

This works but it also changes the program slightly. The tilemap will move noticeably slower (well maybe not since you're not smoothscrolling) with this since it will be drawing a tile for every 8x8 juncture on the screen. Before, the tilemap would be drawn faster or slower depending on how many tiles are on screen. Both methods have their advantages/disadvantages- basically it's speed vs consistency.

could you attach a source code for this so I don't have to retype it into my calc?

You can copy it into Tokens or SourceCoder and export it that way

This works but it also changes the program slightly. The tilemap will move noticeably slower (well maybe not since you're not smoothscrolling) with this since it will be drawing a tile for every 8x8 juncture on the screen. Before, the tilemap would be drawn faster or slower depending on how many tiles are on screen. Both methods have their advantages/disadvantages- basically it's speed vs consistency.

Ah, okay, that makes sense.  That must have been the way I saw it at first, and it just stuck.
Thanks for explaining it

What are you having problems with? What is your code?

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If getKey(1) and (sub(GT,X,Y+8)=0 or sub(GT,X,Y+8)=3)
...


Axe doesn't know the order of operations, so it evaluates everything from left to right, meaning that it will check if key 1 is pressed and (sub(GT,X,Y+8)=0 or sub(GT,X,Y+8)) equals 3.
Try this instead:
If getKey(1) and (sub(GT,X,Y+8)=0 or (sub(GT,X,Y+8)=3))
Note the extra parentheses around the last conditional.