diff --git a/test3d_t400/depends.txt b/test3d_t400/depends.txt
deleted file mode 100644
index 2cec86e..0000000
--- a/test3d_t400/depends.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-default
-digilines
diff --git a/test3d_t400/init.lua b/test3d_t400/init.lua
deleted file mode 100644
index 46d11c4..0000000
--- a/test3d_t400/init.lua
+++ /dev/null
@@ -1,136 +0,0 @@
-local MEMSIZE=16 -- does this still apply?
-local SHUTUP = false
-if not digiline then
- print("Digilines not found.")
- return
-end
-local path = minetest.get_modpath(minetest.get_current_modname())
-local t400 = dofile(path.."/t400.lua")
-local oldprint=print
-local function print(...)
- if SHUTUP then return end
- for k,v in ipairs({...}) do
-  oldprint("[Test3D:T400] "..tostring(v))
- end
-end
-print("Loading.")
-
-local function pos2string(pos)
- return tostring(pos.x)..","..tostring(pos.y)..","..tostring(pos.z)
-end
-
-local function push(pos,val)
- local meta = minetest.get_meta(pos)
- local sstring = ""
- local sstab = string.split(meta:get_string("stack"),"\n")
- sstab[#sstab+1] = tostring(tonumber(val) % 4096)
- if #sstab > MEMSIZE then
-  table.remove(sstab,1)
- end
- for k,v in ipairs(sstab) do
-  sstring = sstring .. v .. "\n"
- end
- meta:set_string("stack",sstring)
-end
-
-function rqaddr(pos,addr,tp)
- local meta = minetest.get_meta(pos)
- meta:set_string("state","waiting"..tostring(tp))
- meta:set_string("addr",addr)
- print("rqaddr: "..addr.." "..tp)
- digiline:receptor_send(pos,digiline.rules.default,meta:get_string("channel")..string.format("%X",tonumber(addr)),"get")
-end
-
-local function t400_set_meta(pos)
- local meta = minetest.get_meta(pos)
- local stab = {}
- stab.stack,stab.rstack = {},{}
- for i = 1, MEMSIZE do
-  stab.stack[#stab.stack+1] = 0
-  stab.rstack[#stab.stack+1] = 0
- end
- stab.cins = 0
- stab.pc = 0
- meta:set_string("stab",minetest.serialize(stab))
- meta:set_string("channel","")
- meta:set_string("rw","")
- meta:set_string("state","running")
- meta:set_int("pc",0)
- meta:set_string("formspec","size[5,5]\nlabel[0.4,0.5;T400 Execution Node]\nfield[0.5,2;4,1;channel;Channel prefix;${channel}]\nfield[0.5,3;4,1;pc;Program Counter;${pc}]field[0.5,4;4,1;state;State;${state}]")
- print("Set metadata for a T400 node at "..pos2string(pos))
-end
-
-minetest.register_node("test3d_t400:t400", {
- description = "T400 Execution Node",
- tiles = {
-  {
-   image="t400.png",
-   animation={
-    type = "vertical_frames",
-    aspect_w=16,
-    aspect_h=16,
-    length=18,
-    length=1.8,
-   },
-  },
- },
- groups = {snappy=1,choppy=2,oddly_breakable_by_hand=2,flammable=3},
- on_construct = t400_set_meta,
- on_receive_fields = function(pos,_,fields,sender)
-  print("Received fields for a T400 node at "..pos2string(pos))
-  for k,v in pairs(fields) do print(tostring(k).." = "..tostring(v)) end
-  local meta = minetest.get_meta(pos)
-  if fields.channel ~= nil then
-   meta:set_string("channel",fields.channel)
-  end
-  if fields.pc ~= nil then
-   local stab = minetest.deserialize(meta:get_string("stab"))
-   stab.pc = tonumber(fields.pc)
-   meta:set_int("pc",fields.pc) -- for display only
-   meta:set_string("stab",minetest.serialize(stab))
-  end
-  if fields.state ~= nil then
-   meta:set_string("state",fields.state)
-  end
- end,
- digiline = {
-  receptor = {},
-  effector = {
-   action = function(pos,node,channel,msg)
-    local meta = minetest.get_meta(pos)
-    local stab = minetest.deserialize(meta:get_string("stab"))
-    print(meta:get_string("state").." "..meta:get_string("addr"),channel.." "..msg.." = "..meta:get_string("channel")..string.format("%X",meta:get_string("addr")))
-    if meta:get_string("state") == "waitingread" and meta:get_string("channel")..string.format("%X",meta:get_string("addr")) == channel then
-     push(pos,tonumber(msg)%4096)
-     rqaddr(pos,stab.pc,"ins")
-    elseif meta:get_string("state") == "waitingins" and meta:get_string("channel")..string.format("%X",meta:get_string("addr")) == channel then
-     stab.ins = (tonumber(msg)%4096)
-     meta:set_string("state","running")
-    end
-   end
-  }
- }
-})
-print("T400 node registered")
-minetest.register_abm({
- nodenames={"test3d_t400:t400"},
- interval=1,
- chance=1,
- action = function(pos)
-  local meta = minetest.get_meta(pos)
-  if meta:get_string("state") ~= "running" then return false end
-  local stab = minetest.deserialize(meta:get_string("stab"))
-  local stab, rw, addr, dat = t400.run(stab)
-  meta:set_int("pc",stab.pc)
-  meta:set_string("stab",minetest.serialize(stab))
-  print(minetest.serialize(stab))
-  if rw == "read" then
-   rqaddr(pos,addr,rw)
-  else
-   if rw == "write" then
-    digiline:receptor_send(pos,digiline.rules.default,meta:get_string("channel")..string.format("%X",addr),dat)
-   end
-   rqaddr(pos,stab.pc,"ins")
-  end
- end
-})
diff --git a/test3d_t400/t400.lua b/test3d_t400/t400.lua
deleted file mode 100644
index 136f030..0000000
--- a/test3d_t400/t400.lua
+++ /dev/null
@@ -1,85 +0,0 @@
-local t = {}
--- internal state
---- program counter (pc)
---- current instruction (ci) -- only passed from the environment to the emulator
---- stack (stack)
-local function pop(s)
- return table.remove(s,#s) or 0
-end
-local function push(s,v)
- v=v or 0
- s[#s+1] = v%4096
- if #s > 16 then
-  table.remove(s,1)
- end
-end
-
-function t.run(stab)
- -- variables
- local pc = stab.pc or 1
- local ci = stab.cins or 0
- local stack = stab.stack or {}
- local rstack = stab.rstack or {}
- local pci = 1
- local rw = nil
- local addr = 0
- local dat = 0
- -- instruction processing
- if ci == 4095 then -- ppc
-  push(stack,pc)
- elseif ci == 4094 then -- swp
-  a=pop(stack)
-  b=pop(stack)
-  push(stack,a)
-  pusk(stack,b)
- elseif ci == 4093 then -- read
-  rw = "read" -- terrible IPC
-  addr = pop(stack)
- elseif ci == 4092 then -- write
-  rw = "write"
-  addr = pop(stack)
-  dat = pop(stack)
- elseif ci == 4091 then -- add
-  push(stack,pop(stack)+pop(stack))
- elseif ci == 4090 then -- sub
-  push(stack,pop(stack)+pop(stack))
- elseif ci == 4089 then -- jmp
-  pc = pop(stack)
-  pci = 0
- elseif ci == 4088 then -- sez
-  if pop(stack) == 0 then
-   pci = pci + 1
-  end
- elseif ci == 4087 then -- jez
-  local a = pop(stack)
-  if pop(stack) == 0 then
-   pc = a
-   pci = 0
-  end
- elseif ci == 4086 then -- jsr
-  push(rstack,pc)
-  pc = pop(stack)
-  pci = 0
- elseif ci == 4085 then -- ret
-  pc = pop(rstack)
- elseif ci == 4084 then -- dup
-  local v = pop(stack)
-  push(stack,v)
-  push(stack,v)
- elseif ci == 4083 then -- drop
-  pop(stack)
- elseif ci == 4082 then -- hlt
-  rw = "halt"
- else
-  push(stack,ci)
- end
- -- return stuff
- stab = {}
- stab.pc = pc + pci -- increment pc
- stab.cins = 0
- stab.stack = stack
- stab.rstack = rstack
- return stab, rw, addr, dat
-end
-
-return t
diff --git a/test3d_t400/textures/t400.png b/test3d_t400/textures/t400.png
deleted file mode 100644
index e5bfed3..0000000
Binary files a/test3d_t400/textures/t400.png and /dev/null differ
diff --git a/test3d_t416/depends.txt b/test3d_t416/depends.txt
deleted file mode 100644
index 2cec86e..0000000
--- a/test3d_t416/depends.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-default
-digilines
diff --git a/test3d_t416/init.lua b/test3d_t416/init.lua
deleted file mode 100644
index 601e51a..0000000
--- a/test3d_t416/init.lua
+++ /dev/null
@@ -1,68 +0,0 @@
-local MEMSIZE=16
-if not digiline then
- print("Digilines not found.")
- return
-end
-local oldprint=print
-local function print(...)
- for k,v in ipairs({...}) do
-  oldprint("[Test3D:T416] "..tostring(v))
- end
-end
-print("Loading.")
-
-local function t416_digiline_receive(pos, node, channel, msg)
- --print("Digiline: "..tostring(pos.x)..","..tostring(pos.y)..","..tostring(pos.z).."; Channel: "..tostring(channel).."; Message: "..tostring(msg))
- local meta = minetest.get_meta(pos)
- local mem = string.split(meta:get_string("mem"),"\n")
- local ms = ""
- local chan = meta:get_string("channel")
- local memoffset = meta:get_int("startaddr")
- if channel:sub(1,#chan) == chan and tonumber(channel:sub(#chan+1),16)+1-memoffset <= MEMSIZE and tonumber(channel:sub(#chan+1),16)+1-memoffset > 0 then
-  local memaddr = tonumber(channel:sub(#chan+1),16)+1-memoffset
-  if tostring(msg):lower() == "get" then
-   digiline:receptor_send(pos, digiline.rules.default, channel, tonumber(mem[memaddr] or 0))
-   print("Reading address "..tostring(memaddr)..": "..tostring(mem[memaddr]))
-  else
-   mem[memaddr] = tonumber(msg) or 0
-   for k,v in ipairs(mem) do
-    ms = ms .. tostring(v) .. "\n"
-   end
-   meta:set_string("mem",ms)
-   print("Set address "..tostring(memaddr).." to "..tostring(tonumber(msg)))
-  end
- end
-end
-print("Created T416 digiline function")
-
-local function t416_set_meta(pos)
- local meta = minetest.get_meta(pos)
- local ms = ""
- for i = 1, MEMSIZE do
-  ms = ms .. "0\n"
- end
- meta:set_string("mem",ms)
- meta:set_string("channel","Default")
- meta:set_int("startaddr",0)
- meta:set_string("formspec","size[5,12]\nlabel[0.4,0.5;T416 Memory Node (16 words)]\nfield[0.5,2;4,1;channel;Channel prefix;${channel}]\nfield[0.5,3;4,1;startaddr;Starting address;${startaddr}]\ntextarea[0.5,4;4,8;mem;Memory contents;${mem}]")
-end
-minetest.register_node("test3d_t416:t416", {
- description = "T416 Memory Node",
- tiles = {"t416-top.png","t416-top.png","t416-side.png","t416-side.png","t416-side.png","t416-side.png"},
- on_construct = t416_set_meta,
- groups = {snappy=1,choppy=2,oddly_breakable_by_hand=2,flammable=3},
- digiline = {
-  receptor = {},
-  effector = {
-   action = function (a,b,c,d) pcall(t416_digiline_receive,a,b,c,d) end
-  }
- },
- on_receive_fields = function(pos,_,fields,sender)
-  if fields.channel == nil then return end
-  local meta = minetest.get_meta(pos)
-  fields.channel = fields.channel or ""
-  meta:set_string("channel",fields.channel)
-  meta:set_int("startaddr",tonumber(fields.startaddr))
- end
-})
-print("T416 node registered")
diff --git a/test3d_t416/textures/t416-side.png b/test3d_t416/textures/t416-side.png
deleted file mode 100755
index 43b5703..0000000
Binary files a/test3d_t416/textures/t416-side.png and /dev/null differ
diff --git a/test3d_t416/textures/t416-top.png b/test3d_t416/textures/t416-top.png
deleted file mode 100755
index 05c2d9c..0000000
Binary files a/test3d_t416/textures/t416-top.png and /dev/null differ