Ports Modular Computers from Baystation

This is just the initial parts. Additional work will probably be necessary.

code/modules/modular_computers/hardware/network_card.dm

@@ -0,0 +1,73 @@
+var/global/ntnet_card_uid = 1
+
+/obj/item/weapon/computer_hardware/network_card/
+	name = "basic NTNet network card"
+	desc = "A basic network card for usage with standard NTNet frequencies."
+	power_usage = 50
+	critical = 0
+	icon_state = "netcard_basic"
+	hardware_size = 1
+	var/identification_id = null	// Identification ID. Technically MAC address of this device. Can't be changed by user.
+	var/identification_string = "" 	// Identification string, technically nickname seen in the network. Can be set by user.
+	var/long_range = 0
+	var/ethernet = 0 // Hard-wired, therefore always on, ignores NTNet wireless checks.
+
+/obj/item/weapon/computer_hardware/network_card/New(var/l)
+	..(l)
+	identification_id = ntnet_card_uid
+	ntnet_card_uid++
+
+/obj/item/weapon/computer_hardware/network_card/advanced
+	name = "advanced NTNet network card"
+	desc = "An advanced network card for usage with standard NTNet frequencies. It's transmitter is strong enough to connect even off-station."
+	long_range = 1
+	power_usage = 100 // Better range but higher power usage.
+	icon_state = "netcard_advanced"
+	hardware_size = 1
+
+/obj/item/weapon/computer_hardware/network_card/wired
+	name = "wired NTNet network card"
+	desc = "An advanced network card for usage with NTNet. This one uses wired connection."
+	ethernet = 1
+	power_usage = 100 // Better range but higher power usage.
+	icon_state = "netcard_ethernet"
+	hardware_size = 3
+
+/obj/item/weapon/computer_hardware/network_card/Destroy()
+	if(holder2 && (holder2.network_card == src))
+		holder2.network_card = null
+	holder2 = null
+	..()
+
+// Returns a string identifier of this network card
+/obj/item/weapon/computer_hardware/network_card/proc/get_network_tag()
+	return "[identification_string] (NID [identification_id])"
+
+// 0 - No signal, 1 - Low signal, 2 - High signal. 3 - Wired Connection
+/obj/item/weapon/computer_hardware/network_card/proc/get_signal(var/specific_action = 0)
+	if(!holder2) // Hardware is not installed in anything. No signal. How did this even get called?
+		return 0
+
+	if(!enabled)
+		return 0
+
+	if(ethernet) // Computer is connected via wired connection.
+		return 3
+
+	if(!ntnet_global || !ntnet_global.check_function(specific_action)) // NTNet is down and we are not connected via wired connection. No signal.
+		return 0
+
+	if(holder2)
+		var/turf/T = get_turf(holder2)
+		if((T && istype(T)) && T.z in using_map.station_levels)
+			return 2
+
+	if(long_range) // Computer is not on station, but it has upgraded network card. Low signal.
+		return 1
+
+	return 0 // Computer is not on station and does not have upgraded network card. No signal.
+
+/obj/item/weapon/computer_hardware/network_card/Destroy()
+	if(holder2 && (holder2.network_card == src))
+		holder2.network_card = null
+	..()