DP Library - Manuals
http://www.digitpress.com/library/manuals/nes/index.html
Sumatra PDF is a free, open source reader of PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, and CBR files. Note: Some manuals are in text format while others are in PDF format, which makes them perfect for printing, and adding to a custom collecting binder. If you need the utility to view these, click the above link to get it.