https://www-cs-faculty.stanford.edu/~knuth/mmixware.html https://www-cs-faculty.stanford.edu/~knuth/mmixware.html - MMIXware by Knuth introduces the updated ass

https://www-cs-faculty.stanford.edu/~knuth/mmixware.html https://www-cs-faculty.stanford.edu/~knuth/mmixware.html - MMIXware by Knuth introduces the updated assembly. https://www.mmix.cs.hm.edu/supplement/index.html https://www.mmix.cs.hm.edu/supplement/index.html - The MMIX Supplement by Ruckert The first introduces the updated assembly language, the second updates all the MIX programs from Volumes 1-3 to MMIX.