Routines
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33178: SetRoomOrigin
Loads the current room's (row, column) pair from RoomOriginTable and sets RoomCellCursor (grid buffer + 20*row + col) and RoomAttrCursor (attribute file + 32*row + col) for the door drawing pass.
33178 LD A,(31242) A = current room
33181 AND 63 index RoomOriginTable (2 bytes/room)
33183 ADD A,A
33184 LD D,0
33186 LD E,A
33187 LD HL,26501 RoomOriginTable
33190 ADD HL,DE
33191 LD B,(HL) B = row, C = column
33192 INC HL
33193 LD C,(HL)
33194 PUSH BC
33195 LD DE,20 grid buffer + 20*row + col
33198 LD HL,26121
33201 ADD HL,DE
33202 DJNZ 33201
33204 ADD HL,BC
33205 LD (31259),HL -> RoomCellCursor
33208 POP BC
33209 LD HL,22528 attribute file + 32*row + col
33212 LD DE,32
33215 ADD HL,DE
33216 DJNZ 33215
33218 ADD HL,BC
33219 LD (31255),HL -> RoomAttrCursor
33222 RET
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