Used by the routine at OBJECT_DONE.

Called at the end of every turn (OBJECT_DONE). The draw list (DRAW_LIST) holds the number of every record to be drawn this turn, up to an $FF, and SEQUENCE_AT steps through it. First, for each one that moved -- bit 5 of its flags, cleared here -- the area covering both where it was drawn last turn (+1C to +1F) and where it is now (+18 to +1B) is cleared in the buffer and remembered on the stack, WIPE_COUNT counting them. Then every listed object is drawn into the buffer in depth order (SORT_AND_DRAW), and the carried things on the panel if they changed (SHOW_CARRIED); and last the remembered areas -- and only those -- are copied to the screen.

Nothing is ever rubbed out on the screen itself, so nothing flickers: the scenery is made of objects too, so what stood behind a moving thing is simply drawn again. On the first turn in a room (NEW_ROOM set) nothing is wiped: the buffer is freshly built and the main loop shows all of it. The areas count towards the turn's drawing work (DRAW_WORK), which sets how long the main loop waits. Pentagram's routine, instruction for instruction; Knight Lore's does the same in more pieces.