Routines
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D432: Copy one background template into an object record
A background template is eight bytes that become bytes 0 to 7 of the record unchanged: graphic, x, y, z, the half-sizes in x and y, the height, and the flags. Byte 8 is the room, and the rest of the record is cleared. A background's templates follow one another and end at a 0 byte, where the next graphic number would be; graphic 0 is never an object.
next_bg_obj_sprite D432 LD BC,$0008 bytes 0 to 7 straight from the template
D435 LDIR
D437 LD A,(IX+$08) byte 8: the room it belongs to
D43A LD (DE),A
D43B INC DE
D43C LD B,$17 bytes 9 to 31 cleared
D43E CALL zero_DE
D441 LD A,(HL) more templates for this background until a 0
D442 AND A
D443 JR NZ,next_bg_obj_sprite
D445 POP HL one byte of the room record used; next background
D446 POP BC
D447 DJNZ next_bg_obj
D449 JP zero_end_of_graphic_objs_tbl a record with only backgrounds: clear the rest of the table
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