Fixes #11263.

Now possible to use items other than emags on holodeck computers
Blobs no longer make computers lose their density state.
Holodeck computers can now be repaired (and built, but since they cannot be configured they'll be useless).
Fixes #11263.

code/game/machinery/computer/computer.dm

@@ -12,6 +12,11 @@
 	var/light_range_on = 3
 	var/light_power_on = 1
 
+/obj/machinery/computer/Destroy()
+	qdel(circuit)
+	circuit = null
+	return ..()
+
 /obj/machinery/computer/initialize()
 	power_change()
 
@@ -70,7 +75,6 @@
 		for(var/x in verbs)
 			verbs -= x
 		set_broken()
-		density = 0
 
 /obj/machinery/computer/update_icon()
 	..()
@@ -124,22 +128,15 @@
 			for (var/obj/C in src)
 				C.loc = src.loc
 			if (src.stat & BROKEN)
-				user << "\blue The broken glass falls out."
+				user << "<span class='notice'>The broken glass falls out.</span>"
 				new /obj/item/weapon/material/shard( src.loc )
 				A.state = 3
 				A.icon_state = "3"
 			else
-				user << "\blue You disconnect the monitor."
+				user << "<span class='notice'>You disconnect the monitor.</span>"
 				A.state = 4
 				A.icon_state = "4"
 			M.deconstruct(src)
 			qdel(src)
 	else
-		src.attack_hand(user)
-	return
-
-
-
-
-
-
+		..()

code/game/objects/items/weapons/circuitboards/computer/holodeckcontrol.dm

@@ -0,0 +1,31 @@
+#ifndef T_BOARD
+#error T_BOARD macro is not defined but we need it!
+#endif
+
+/obj/item/weapon/circuitboard/holodeckcontrol
+	name = T_BOARD("holodeck control console")
+	build_path = /obj/machinery/computer/HolodeckControl
+	origin_tech = "programming=2;bluespace=2"
+	var/last_to_emag
+	var/linkedholodeck_area
+	var/list/supported_programs
+	var/list/restricted_programs
+
+/obj/item/weapon/circuitboard/holodeckcontrol/construct(var/obj/machinery/computer/HolodeckControl/HC)
+	if (..(HC))
+		HC.supported_programs	= supported_programs.Copy()
+		HC.restricted_programs	= restricted_programs.Copy()
+		if(linkedholodeck_area)
+			HC.linkedholodeck	= locate(linkedholodeck_area)
+		if(last_to_emag)
+			HC.last_to_emag		= last_to_emag
+			HC.emagged 			= 1
+			HC.safety_disabled	= 1
+
+/obj/item/weapon/circuitboard/holodeckcontrol/deconstruct(var/obj/machinery/computer/HolodeckControl/HC)
+	if (..(HC))
+		linkedholodeck_area		= HC.linkedholodeck_area
+		supported_programs		= HC.supported_programs.Copy()
+		restricted_programs 	= HC.restricted_programs.Copy()
+		last_to_emag			= HC.last_to_emag
+		HC.emergencyShutdown()