Word table with a clever triple use. The action key (HandleInput at $881B) dispatches table[room_mode] with room_mode from 31252:

Mode	Handler
0-1	RoomModeDispatch
2-3	LocationListAction — Indicate Location list, pages 1 (rooms 0-16) and 2 (rooms 17-33)
4	GetItemPick — item picked from the Get strip

For modes 0 and 1 RoomModeDispatch then re-dispatches on the cursor ROW through overlapping halves of this same table (entry 5 onward = base $840C, entry 23 onward = base $8430):

Mode-0 rows (orders screen), base $840C:

Row	Cell	Handler
0	"Order:" header	RoomHandlerNop
1-7	crew slots 1-7	OpenCrewRoomView
8	" Indicate "	IndicateLocation: opens the room-location list (mode 2)
9	" Location "	nop (2nd row of the 2-row label)
10-11	" Display "/" Level "	nop (header for the deck rows)
12-14	Upper/Middle/Lower	SelectDeckMap: deck map
15-18	blank	nop

Mode-1 rows (room view / action menu), base $8430:

Row	Cell	Handler
0	"move to:" header	nop
1	"Grille" (open duct)	MoveThroughGrille
2-6	exit rooms	MoveToRoom
7	" use:" header	nop
8	front-hand item	RoomHandlerNop2; but the pre-dispatch hook ($B2C0) zeroes the actor's action countdown — pressing the held-item row cancels a pending timed job
9	back-hand item	SwapHeldItems
10	"Get Item"	GetItemMenu
11	"Leave Item"	LeaveItemHandler
12	"Special" header	nop
13	special action	$8BCB -> SpecialRowAction ($B306): 52 ATTACK / 49 RmveGrille / 238 = RmveGrille swapped to ATTACK under the cursor (hostile in the room — see PreDispatchHook $B2B9)
14	"Get Jones"	GetJonesHandler: needs the Net or the Cat Box
15-16	fixture actions	FixtureAction
17	" QUIT "	QuitRoomView
18	blank	nop (reuses CrewActionDispatch+0)

The mode-1 row words for rows 11-17 are the "RoomDispatchTailExtra" bytes at 33862; row 18 overlaps CrewActionDispatch's first entry.