These are left over from my grad school days (doing image analysis on an 11/45)- a two volume set of paperbacks printed in 1972. Partial contents: Volume 1: Computer Programming Fundamentals - computer, programming, techniques Online Operations - system description and ops (pdp8e), loading, editing, debugging Advanced Programming Techniques - i/o, DECtape, FPP Programming Systems - OS/8, educational systems Volume 2: Interactive Languages - FOCAL-8, 8K BASIC Compiler Language - FORTRAN Machine Language - 4K and 8K assemblers Covers are scuffed and creased but bindings are tight and contents are clean and intact. Pages are yellowing - DEC did not spend a lot of money printing these - but not (yet) brittle. These things should be really be .pdf'd but it would require destroying the bindings and I'm not ready to do that with this set. Will trade for original Compupro/Godbout CPU-Z, Disk1A, Disk3, or Morrow or ? docs. Jack Rubin