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   DIR phlog 
           Ramblings, thoughts, hacking and other posts in what used to be my
         ExpressIT web log (English & Spanish).
       
   DIR ITS
           Notes on MIT's A.I. lab Incompatible Timesharing System
       
   DIR TOPS-20
           Notes on Digital Equipement Corporation's TOPS-20
         Operating System for the PDP-10 computer
       
   DIR SDF
           Texts related to SDF Public Access Unix System
       
   DIR Writings 
           Texts of my own (English & Spanish)
       
   DIR MiKiwi
           A wiki attempt since 2005, assorted topics from server administration to
         obscure operating systems, databases and howtos. (Spanish)