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53870: Start of setting up room routine
Used by the routine at 51359.
Jump here from the check at 51414 if the room item type (60227) = 32.
Item type 32 is always the first data set in the room data sets (at 31744). It holds the position of the 'viewport' of the room, which is used to adjust room item co-ordinates.
53870 LD HL,(60233) Overflow/precision byte for vertical position of room viewport - 60233 > 60150
53873 LD (60150),HL Copy into game buffer
53876 LD HL,(60231) Overflow/precision byte for horizontal position of room viewport - 60231 > 60152
53879 LD (60152),HL Copy into game buffer
53882 JP 54053
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