Incompatibilities between versions

CC: Tweaked tries to remain as compatible between versions as possible, meaning you should be able to run code written on very old versions of ComputerCraft on the latest version of the mod. However, some changes to the underlying game, or ComputerCraft's own internals may make incompatible.

This page serves as documentation for breaking changes and "gotchas" one should look out for between CC:T versions.

Minecraft 1.14 to 1.15

• The config file has now been split into client and server config files.
  • Client config can be found in config/computercraft-client.toml.
  • Server config can be found in saves/<world>/serverconfig/computercraft-server.toml. These are now save-specific - it is currently impossible to have a global configuration. However, you can create a default config by placing it in defaultconfigs/computercraft-server.toml.
• The ComputerCraft Java API has been entirely rewritten to allow for more efficient Lua/Java interop. This should have no impact on users, but makes the API easier to use and reduces overhead.
• The default treasure disks have been entirely removed. They are now added by an external data pack, which also registers them as dungeon loot. The same system may be used to provide your own loot disks.
• turtle.getItemDetail no longer includes damage by default. One must now pass true as the second parameter. turtle.getItemDetail() becomes turtle.getItemDetail(nil, true), and turtle.getItemDetail(slot) becomes turtle.getItemDetail(slot, true).

Minecraft 1.12 to 1.13

• The "key code" for key and key_ups has changed, due to Minecraft updating to LWJGL 3. Make sure you're using the constants provided by the keys API, rather than hard-coding numerical values.

  Related to this change, the numpad enter key now has a different key code to the enter key. You may need to adjust your programs to handle both. (Note, the keys.numpadEnter constant was defined in pre-1.13 versions of CC, but the keys.enter constant was queued when the key was pressed)

• Minecraft 1.13 removed the concept of item damage and block metadata (see "The Flattening"). As a result turtle.inspect no longer provides block metadata, and turtle.getItemDetail no longer provides damage.

  • Block states (turtle.inspect().state) should provide all the same information as block metadata, but in a much more understandable format.
  • Item and block names now represent a unique item type. For instance, wool is split into 16 separate items (minecraft:white_wool, etc...) rather than a single minecraft:wool with each meta/damage value specifying the colour.

• Custom ROMs are now provided using Data packs rather than resource packs. This should mostly be a matter of renaming the "assets" folder to "data", and placing it in "datapacks", but there are a couple of other gotchas to look out for:

  • Data packs impose some restrictions on file names. As a result, your programs and directories must all be lower case.
  • Due to how data packs are read by CC: Tweaked, you may need to use the /reload command to see changes to your pack show up on the computer.
  • See the example datapack for how to get started.

• Turtles can now be waterlogged and move "through" water sources rather than breaking them.

Minecraft 1.8 to 1.12

• Programs run via shell.run are now started in their own isolated environment. This means globals set by programs will not be accessible outside of this program.
• (CC: Tweaked 1.88.0+) Computers now always keep their ID when broken, meaning that unlabelled computers/items do not stack.