The two applications were developed on quite different computers and with quite different toolchains. Interestingly, Knuth has stated that his development of L

The two applications were developed on quite different computers and with quite different toolchains. Interestingly, Knuth has stated that his development of Literate Programming: http://literateprogramming.com/ http://literateprogramming.com/ was more important than TeX --- fortunately, his publishing _TeX: The Program_: https://www.goodreads.com/book/show/499934.Computers_Typesetting_Volume_B https://www.goodreads.com/book/show/499934.Computers_Typeset... has been very helpful to folks developing successors and add-ons and new versions, facilitating the creation of web2c and change files which made tools such as pdftex and omega and xetex and luatex possible).