This is a rare find for collectors of vintage computing. The LSI Lear Siegler ADM-3A Computer Operators Handbook is an original manual for the ADM-3A model. It is a must-have for enthusiasts of antique technology, especially those interested in the history of computing. This handbook provides valuable insights into the operation and maintenance of the ADM-3A computer, manufactured by Lear Siegler in the past. The vintage aspect of this item only adds to its appeal and makes it a unique addition to any vintage computing collection. There is some pencil writing on a couple pages.