Routines
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49600: Set up LEFT vertical wall/floor connector graphics
Prepare the room corner join graphics - one of two sorts, for either 'brick' or 'cavern' levels
The right wall/floor connector is set up later at 49912
left side wall-floor connector left side wall-floor connector
49600 LD A,6 Graphic type = 6 (corner wall section)
49602 LD (60227),A
49605 LD A,48 Vertical position (in pixels) from top of room space
49607 LD (60234),A
49610 LD A,16 Horizontal position (in 4-pixel/half-character steps) from left of room space
49612 LD (60232),A
49615 LD A,2
49617 LD (60240),A Graphic number offset for scenery graphic address (n-1)*2 = 2
The standard corner section is the right-hand one (40462). For the left one (as in the above images) we want the mirrored version, the graphics pointer to which is the next address (2 bytes) location
49620 LD C,18 Graphic number offset for corner wall section in graphic address table at 38851; (n-1)*2 = 34 = 38885
49622 LD A,(60279) Extra offset (+12 addresses) in table if the player is on a 'cavern' level
49625 ADD A,C Addresses offset will now be 18 or 30, e.g. for wall section at 38885 or 38909.
49626 CALL 57538 Prep graphic address pointers at pointer table at 38851, including mirrored graphics of the sections
49629 CALL 57520 Copy the data for these graphics from its buffer at 60227 into a room item data set at 31744
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