Librascope/General Precision LGP-21 Hardware Maintenance Manual

This is the LGP-21 Hardware Maintenance and Training Manual supplied with the machine, page-scanned at 150 dpi, 11.5" x 8.5" (U.S. A size). It contains operation, theory of operation (including a complete algebraic definition of all the machine logic), memory alignment procedures and a complete set of logic diagrams, photographs and schematics.

The original manual, borrowed from the Computer Museum of America, was copied, then scanned on an ordinary flatbed scanner. Each page image was saved to a disk file, named with the original document's page number (eg. page 1-3 became disk file 1-3.tiff). A simple text file contains these page-numbers, ordered, and notable pages have a title or description separated from the page number by a tab character.

These pages were then created with a Perl script that takes a simple text-file list of page number/filenames and descriptions, and creates all of the HTML. This allows updating the entire dataset easily and portably.