diff --git a/computer/13/garbage/evil.lua b/computer/13/garbage/evil.lua
new file mode 100644
index 0000000..8f437c3
--- /dev/null
+++ b/computer/13/garbage/evil.lua
@@ -0,0 +1,21 @@
+sfx = require("sfx")
+return
+parallel.waitForAll(
+	function()
+		while true do
+			sleep(math.random(10, 100))
+			if math.random(10) > 5 then
+				sfx.fail()
+			else
+				sfx.success()
+			end
+			event = { os.pullEventRaw() }
+			if event[1] == "terminate" then
+				shell.exit()
+				os.shutdown()
+			end
+		end
+	end, function()
+		term.setCursorPos(1, 1)
+		shell.run("shell")
+	end)
diff --git a/computer/13/make_belts.lua b/computer/13/garbage/make_belts.lua
similarity index 100%
rename from computer/13/make_belts.lua
rename to computer/13/garbage/make_belts.lua
diff --git a/computer/13/inventory.lua b/computer/13/inventory.lua
index edfca6f..c0276fa 100644
--- a/computer/13/inventory.lua
+++ b/computer/13/inventory.lua
@@ -1,7 +1,16 @@
 pp = require("cc.pretty")
 
-pFront = peripheral.wrap("front")
-pDown = peripheral.wrap("bottom")
+function pFront(fn, ...)
+	return peripheral.call("front", fn, unpack(arg))
+end
+
+function pBottom(fn, ...)
+	return peripheral.call("bottom", fn, unpack(arg))
+end
+
+function pTop(fn, ...)
+	return peripheral.call("top", fn, unpack(arg))
+end
 
 function findItems(item_list, target)
 	for i, v in pairs(item_list) do
@@ -12,31 +21,8 @@ function findItems(item_list, target)
 	return nil
 end
 
--- uses selected item
-function insertForward(slot, count)
-	turtle.dropDown(count)
-	pFront.pullItems("bottom", 1, 64, slot)
-end
-
-function takeForward(slot)
-	-- pDown.pullItems("front", slot, 64, 1)
-	peripheral.call("bottom", "pullItems", "front", slot or 1)
-	turtle.suckDown()
-end
-
-function insertDepot(count)
-	turtle.dropDown(count)
-	peripheral.call("front", "pullItem", "bottom")
-end
-
-function takeDepot()
-	peripheral.call("front", "pushItem", "bottom")
-	turtle.suckDown()
-end
-
-
 function takeItems(type, count)
-	local item_list = pFront.list()
+	local item_list = pFront("list")
 	local slot = findItems(item_list, type)
 
 	if slot == nil then
@@ -44,18 +30,31 @@ function takeItems(type, count)
 		return false
 	end
 
-	empty_slot = pFront.size()
-	-- todo error if not empty
-	pFront.pullItems("front", 1, 64, empty_slot) -- empty first slot
-	pFront.pullItems("front", slot, 64, 1) -- get target item to first slot
-	pFront.pullItems("front", empty_slot, 64, slot) -- empty last slot for next time
+	if slot ~= 1 then
+		local size = pFront("size")
+		local empty_slot = nil
+		for i = 1, size do
+			if pFront("getItemDetail", i) == nil then
+				empty_slot = i
+				break
+			end
+		end
+		if empty_slot == nil then
+			printError("no empty slot in chest, pls fix")
+			exit()
+		end
+		if empty_slot ~= 1 then
+			pFront("pullItems", "front", 1, 64, empty_slot) -- empty first slot
+		end
+		pFront("pullItems", "front", slot, 64, 1)  -- get target item to first slot
+	end
 	return turtle.suck(count)
 end
 
 function selectItem(name, has_nbt)
 	has_nbt = has_nbt or false
 	if name == nil or name == "nil" then
-		for i = 1,16 do
+		for i = 1, 16 do
 			if turtle.getItemCount(i) == 0 then
 				turtle.select(i)
 				return
@@ -64,7 +63,7 @@ function selectItem(name, has_nbt)
 		printError("no empty slot found")
 		return
 	end
-	for i = 1,16 do
+	for i = 1, 16 do
 		detail = turtle.getItemDetail(i, true);
 		if detail and stripModname(detail.name) == name then
 			if has_nbt == (detail.nbt ~= nil) then
@@ -78,10 +77,10 @@ end
 
 function getMissing(needed_items)
 	missing = {}
-	for name,count in pairs(needed_items) do
+	for name, count in pairs(needed_items) do
 		missing[name] = count
 	end
-	target_contents = peripheral.call("front", "list")
+	target_contents = pFront("list")
 
 	for _, target_item in pairs(target_contents) do
 		for name, missing_count in pairs(missing) do
@@ -98,3 +97,23 @@ function getMissing(needed_items)
 	return missing
 end
 
+function insertForward(slot, count)
+	turtle.dropDown(count)
+	pFront("pullItems", "bottom", 1, 64, slot)
+end
+
+function takeForward(slot)
+	pBottom("pullItems", "front", slot or 1)
+	turtle.suckDown()
+end
+
+function insertDepot(count)
+	turtle.dropDown(count)
+	pFront("pullItem", "bottom")
+end
+
+function takeDepot()
+	pFront("pushItem", "bottom")
+	turtle.suckDown()
+end
+
diff --git a/computer/13/keep_stocked.lua b/computer/13/keep_stocked.lua
deleted file mode 100644
index f0520ab..0000000
--- a/computer/13/keep_stocked.lua
+++ /dev/null
@@ -1,4 +0,0 @@
-keep_stocked = {
-	kelp = 10,
-	flint = 10
-}
\ No newline at end of file
diff --git a/computer/13/machines.lua b/computer/13/machines.lua
index 4df90fa..478c137 100644
--- a/computer/13/machines.lua
+++ b/computer/13/machines.lua
@@ -14,7 +14,7 @@ function mill(extra_items)
 		insertForward(1, item.count)
 	end
 	print(item_count,"items")
-	while peripheral.call("front", "getItemDetail", 1) do
+	while pFront("getItemDetail", 1) do
 		sleep(0.1)
 	end
 	for i = 2, 10 do
@@ -29,7 +29,7 @@ function deploy(extra_items, nbt)
 	goUp()
 	selectItem(extra_items[1].name, nbt)
 	turtle.dropUp(1)
-	peripheral.call("front", "pullItem", "top")
+	pFront("pullItem", "top")
 
 	goDown()
 	goDown()
@@ -39,7 +39,7 @@ function deploy_tool(extra_items)
 	deploy(extra_items, true)
 	goUp()
 	goUp()
-	peripheral.call("front", "pushItem", "top")
+	pFront("pushItem", "top")
 	turtle.suckUp()
 end
 function furnace(extra_items)
@@ -55,7 +55,6 @@ function furnace(extra_items)
 		insertForward(1, item.count)
 	end
 	wait_time = 10 * item_count
-	-- peripheral.call("front", "")
 	-- TODO refuel
 	sleep(wait_time)
 	takeForward(3)
@@ -83,14 +82,7 @@ function mix(extra_items)
 	takeForward(10)
 end
 function craft(extra_items)
-	-- for i = 1, 16 do
-	-- 	if turtle.getItemCount(i) ~= 0 then
-	-- 		turtle.select(i)
-	-- 		turtle.drop()
-	-- 	end
-	-- end
 	local slot = 0
-	print(len(extra_items), "extra items")
 	for _, item in pairs(extra_items) do
 		slot = slot + 1
 		if slot == 4 then
diff --git a/computer/13/main.lua b/computer/13/main.lua
new file mode 100644
index 0000000..600a21b
--- /dev/null
+++ b/computer/13/main.lua
@@ -0,0 +1,14 @@
+pretty = require("cc.pretty").pretty_print
+
+require("recipes")
+sfx = require("sfx")
+require("pathfinding")
+require("inventory")
+
+keep_stocked = {
+	kelp = 10,
+	flint = 10
+}
+
+go_to(vector.new(0,0,0), "south")
+recipes = load_recipes()
\ No newline at end of file
diff --git a/computer/13/pathfinding.lua b/computer/13/pathfinding.lua
index 56cac54..d86096d 100644
--- a/computer/13/pathfinding.lua
+++ b/computer/13/pathfinding.lua
@@ -1,15 +1,7 @@
-pp = require("cc.pretty")
+pp = require("cc.pretty").pretty_print
 
--- if _G.pos == nil then
 _G.facing = "south"
 _G.pos = vector.new(0,0,0)
--- 	file = fs.open("pos.txt", "r")
--- 	data = splitString(file.readAll())
--- 	_G.pos.x = tonumber(data[1])
--- 	_G.pos.y = tonumber(data[2])
--- 	_G.pos.z = tonumber(data[3])
--- 	_G.facing = data[4]
--- end
 
 local up = vector.new(0,1,0)
 
@@ -34,17 +26,9 @@ local vecOf = {
 	west = vector.new(-1,0,0),
 }
 
-function savePos()
-	-- fs.delete("pos.txt")
-	-- file = fs.open("pos.txt", "w")
-	-- file.write(_G.pos.x .. " " .. _G.pos.y .. " " .. _G.pos.z .. " " .. _G.facing)
-end
-
-
 function goUp()
 	if turtle.up() then
 		_G.pos.y = _G.pos.y + 1
-		savePos()
 	else
 		printError("failed to go up")
 		printError(pos)
@@ -54,7 +38,6 @@ end
 function goDown()
 	if turtle.down() then
 		_G.pos.y = _G.pos.y - 1
-		savePos()
 	else
 		printError("failed to go down")
 		printError(pos)
@@ -64,19 +47,16 @@ end
 function goLeft()
 	turtle.turnLeft()
 	_G.facing = leftOf[_G.facing]
-	savePos()
 end
 
 function goRight()
 	turtle.turnRight()
 	_G.facing = rightOf[_G.facing]
-	savePos()
 end
 
 function goForward()
 	if turtle.forward() then
 		_G.pos = _G.pos + vecOf[_G.facing]
-		savePos()
 	else
 		printError("failed to go forward")
 		printError(pos)
@@ -86,7 +66,6 @@ end
 function goBack()
 	if turtle.back() then
 		_G.pos = _G.pos - vecOf[_G.facing]
-		savePos()
 	else
 		printError("failed to go backward")
 		printError(pos)
@@ -112,7 +91,6 @@ end
 function go_to(target, face)
 	while target ~= _G.pos do
 		stepTo(target)
-		-- print(_G.pos, _G.facing)
 	end
 	if face and face ~= _G.facing then
 		if rightOf[_G.facing] == face then
diff --git a/computer/13/pos.txt b/computer/13/pos.txt
deleted file mode 100644
index e69de29..0000000
diff --git a/computer/13/recipes.lua b/computer/13/recipes.lua
index b9faacf..2d64c0e 100644
--- a/computer/13/recipes.lua
+++ b/computer/13/recipes.lua
@@ -1,4 +1,4 @@
-pp = require("cc.pretty")
+pp = require("cc.pretty").pretty_print
 require("stringshit")
 recipes = {}
 
@@ -51,18 +51,17 @@ function read_recipe(file)
 end
 
 function load_recipes()
-  file = fs.open("recipes.txt", "r")
+  local file = fs.open("recipes.txt", "r")
   if not file then
     print("error: no recipes found")
     return
   end
   recipes = {}
   while 1 do
-    r = read_recipe(file)
+    local r = read_recipe(file)
     if r == nil then break end
     recipes[r.product] = r
   end
-  return recipes
 end
 
 function ingredientsOf(recipe)
@@ -80,4 +79,6 @@ function ingredientsOf(recipe)
     items[recipe.base] = (items[recipe.base] or 0) + 1
   end
   return items
-end
\ No newline at end of file
+end
+
+load_recipes()
diff --git a/computer/13/recipes.txt b/computer/13/recipes.txt
index d9f1a45..7172e6a 100644
--- a/computer/13/recipes.txt
+++ b/computer/13/recipes.txt
@@ -160,3 +160,11 @@ craft birch_planks birch_slab birch_planks birch_planks nil birch_planks birch_p
 birch_slab
 steps:
 craft birch_planks birch_planks birch_planks
+
+computer_normal
+steps:
+craft andesite_alloy andesite_alloy andesite_alloy andesite_alloy polished_rose_quartz andesite_alloy andesite_alloy glass_pane andesite_alloy
+
+glass_pane
+steps:
+craft glass glass glass glass glass glass
\ No newline at end of file
diff --git a/computer/13/stringshit.lua b/computer/13/stringshit.lua
index 9b4cbbe..2c2f634 100644
--- a/computer/13/stringshit.lua
+++ b/computer/13/stringshit.lua
@@ -1,3 +1,4 @@
+
 function splitString(source, sep)
   sep = sep or " "
   elements = {}
diff --git a/computer/13/test.lua b/computer/13/test.lua
deleted file mode 100644
index 8d73ea6..0000000
--- a/computer/13/test.lua
+++ /dev/null
@@ -1,3 +0,0 @@
-s = require("sfx")
-s.success()
---s.fail()
diff --git a/computer/13/todo.txt b/computer/13/todo.txt
new file mode 100644
index 0000000..9f3e4e0
--- /dev/null
+++ b/computer/13/todo.txt
@@ -0,0 +1,12 @@
+sw: fluid basin
+hw: spout
+sw: spout
+casting
+stock keeping
+multi-item crafting
+push items into existing stacks in chest
+pull items from multiple stacks if necessary
+refuel self
+refuel furnace
+
+delivery turtle
diff --git a/computer/13/work.lua b/computer/13/work.lua
index 437d8fd..46459bf 100644
--- a/computer/13/work.lua
+++ b/computer/13/work.lua
@@ -1,11 +1,15 @@
 pp = require("cc.pretty")
-require("keep_stocked")
 require("recipes")
 sfx = require("sfx")
 require("pathfinding")
 use_machine = require("machines")
 require("inventory")
 
+keep_stocked = {
+	kelp = 10,
+	flint = 10
+}
+
 go_to(vector.new(0,0,0), "south")
 recipes = load_recipes()
 
@@ -89,15 +93,13 @@ function tryCreating(recipe)
 	if len(missing_ingredients) == 0 then
 		todo[#todo] = nil
 		turtle.select(1)
+		-- todo exclude deploy_tool too and make it get its own tool
 		if recipe.steps[1].machine ~= "craft" then
 			for item, count in pairs(ingredients) do
 				takeItems(item, count)
 			end
 		end
 		doRecipe(current_recipe)
-		-- for item, min_count in pairs(getMissing(keep_stocked)) do
-		-- 	table.insert(todo, recipes[item])
-		-- end
 		return nil
 	end
 	return missing_ingredients
@@ -113,18 +115,6 @@ while #todo > 0 do
 	pp.pretty_print(ingredients)
 	missing_ingredients = tryCreating(current_recipe)
 	if missing_ingredients then
-	-- missing_ingredients = getMissing(ingredients)
-	-- if len(missing_ingredients) == 0 then
-	-- 	todo[#todo] = nil
-	-- 	turtle.select(1)
-	-- 	for item, count in pairs(ingredients) do
-	-- 		takeItems(item, count)
-	-- 	end
-	-- 	doRecipe(current_recipe)
-	-- 	for item, min_count in pairs(getMissing(keep_stocked)) do
-	-- 		table.insert(todo, recipes[item])
-	-- 	end
-	-- else
 		wait_for = listUncraftable(missing_ingredients)
 		while len(wait_for) > 0 do
 			for name,count in pairs(wait_for) do
@@ -141,15 +131,10 @@ while #todo > 0 do
 		for name, count in pairs(missing_ingredients) do
 			if recipes[name] then
 				print("first making", count, name)
-				-- for i = 1,count do
 				table.insert(todo, recipes[name])
-				-- end
 			end
 		end
 	end
-
-	-- print("aaa")
-	-- read()
 end
 print("done!")
 sfx.success()