Routines
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57924: Get Blank Tile
Used by the routine at GetTile.
Used by GetTile when the row is zero. Moves the address back up a row and returns a blank tile.
Input
DE 96
HL Address in the map
Output
A Tile number (zero)
HL Address in the map, one row up
GetBlankTile 57924 AND A Is A zero?
57925 SBC HL,DE Subtract DE and the carry from HL.
57927 XOR A Clear A.
57928 RET Return.
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