Routines
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51168: Update View Flags
Used by the routines at ScrollViewDown, ScrollViewUp, ScrollViewLeft and ScrollViewRight.
Clears bits of the view flags at ViewFlags that are not set in L.
Input
L The bits to keep
UpdateViewFlags 51168 LD A,(23782) Read the byte at ViewFlags.
51171 AND L Keep only the bits of A that are set in L.
51172 LD (23782),A Write A at ViewFlags.
51175 RET Return.
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