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This source was reconstructed to match MUDSAV; TS MUD54 from 1977-07-02, using a combination of all the surviving Muddle source files. The memory layout and pure code is the same. No AGC MUD54 has survived, so the AGC code was adjusted to match the TOPS-20 agc.mud104 from Chicago that Rich Alderson provided (the only ITS conditional is the page size). There's a one-instruction difference in the symbol positions, which I've converted into a patch at the end of the code to maintain the original layout on ITS. The INITM code, which doesn't appear in the final executable, is a best guess but it's probably fairly close, since it generates objects in the right order and locations, and the symbol locations match the original. The 1977 executable has a very large number of patches, which I've replicated in MUD54 INIT. The code that the patches were replacing -- marked with "XXX patched" in the source -- is also a best guess. I haven't checked that the TOPS-20 code is correct; it could be adjusted to match mdl104.exe in the future. It would need STENEX, which could be linked from MUDSYS;.