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$7F837D - Data store in RAM format

Each boxes represents a byte here, each time you go down a box, it is address+1.

☐ - EHHHYXyy \Header data
☐ - yyyxxxxx |
☐ - DRllllll |
☐ - LLLLLLLL /

☐ - TTTTTTTT \Tile data (TTTTTTTT = tile number
☐ - YXPCCCTT /YXPCCCTT = tile properties
☐ - TTTTTTTT \Tile data again (this can repeat based on how many tiles)
☐ - YXPCCCTT /

☐ - Terminating byte (contains the value $FF)


Taken from this.

Header data (4 bytes):
EHHHYXyy
E = end of data, 0 = no, 1 = yes. When writing this, have this clear.
HHH = what layer
%010 (2) = layer 1
%011 (3) = layer 2
%101 (5) = layer 3
Y = Y position, bit 5 (screen bit, if set, 1 screen downwards)
X = X position, bit 5 (screen bit, if set, 1 screen to the right)
yy = Y position, bits 3-4
yyyxxxxx
yyy = Y position, bits 0-2
xxxxx = X position, bits 0-4
DRllllll
D = Direction:
%0 = horizontal
%1 = vertical.
R = RLE bit. Repeats a tile N times if set.
llllll = Length (number of bytes), bits 8-13. This is the number of total bytes (excluding the header and the terminating byte) to write, minus 1, therefore it is (NumberOfTiles*2)-1. If RLE is set, then this length value equals to (NumberOfTiles-1)*2
LLLLLLLL
LLLLLLLL = length (number of bytes), bits 0-7. Same as above