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Add some comments to UpdateBGMap
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@ -117,7 +117,7 @@ UpdateBGMap::
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; Update the BG Map, in thirds, from wTilemap and wAttrmap.
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ldh a, [hBGMapMode]
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and a
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and a ; 0
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ret z
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; BG Map 0
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@ -127,7 +127,7 @@ UpdateBGMap::
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jr z, .Attr
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; BG Map 1
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dec a
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dec a ; useless
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ldh a, [hBGMapAddress]
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ld l, a
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@ -232,7 +232,7 @@ THIRD_HEIGHT EQU SCREEN_HEIGHT / 3
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ldh [hBGMapThird], a
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; Rows of tiles in a third
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ld a, SCREEN_HEIGHT / 3
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ld a, THIRD_HEIGHT
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; Discrepancy between wTilemap and BGMap
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ld bc, BG_MAP_WIDTH - (SCREEN_WIDTH - 1)
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