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Legacy Connector

Run unmodified legacy mods from b1.7.3, 1.4.7, 1.5.2, 1.6.4, 1.7.10, 1.12.2, and 1.20.1 directly on NeoForge 1.21.1.
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Legacy Connector 0.3.6

File namelegacyconnector-0.3.6.jar
Uploader
KyleBeepKyleBeep
Uploaded
Oct 30, 2026
Downloads
186
Size
20.9 MB
Mod Loaders
NeoForge
File ID
9376149
Type
B
Beta
Supported game versions
  • 1.21.1

Curse Maven Snippet

NeoForge

implementation "curse.maven:legacy-connector-1763521:9376149"

Learn more about Curse Maven

What's new

Fixes

1.7.10

  • Entities moved by mods that change their bounding box in place now move. Every read of boundingBox used to return a fresh copy, so these moves were lost. Traincraft trains stayed put on their rails (#105).
  • Legacy sound sources (IC2 machine sounds and others) were silent for the whole session. A startup error disabled them before the game had a sound manager.
  • GUI buttons that rebuild the screen when clicked no longer close it with a ConcurrentModificationException (Traincraft locomotive GUI, #105).

1.12.2

  • World generators that spawn mobs (Vampirism hunter camps) no longer freeze world creation at "Preparing spawn area 18%".
  • Mods written as Scala objects load (OpenComputers).
  • A large batch of legacy API from the parallel API work: vanilla block classes (chests, dispensers, rails, flower pots, redstone and more), entities and AI, path finding, world generation and structures, Forge and FML hooks, the GUI and client APIs, and object holders for every registry type. TerraFirmaCraft's metals and about 2,700 more items now load.
  • Test set of 116 1.12.2 mods: 4,978 blocks and 10,076 items register (was 4,807 and 9,839). 11 mods fail, all except one because a dependency mod is missing.

Tests

  • 1.12.2 server self test (116 mods) and 1.7.10 server self test (66 mods): world generation, 40 of 40 mod dimensions, 6,328 blocks placed and used, entity spawning. No regressions against the previous runs.

This mod has no additional files