http://www.myfonts.com/fonts/ilott-type/64-src/

64-SRC is a rare condensed monospace font inspired by Selectric type from the 1960s. It is characterized by unique "double-space" alternates for the widest characters such as “w” and “m”. These alternates maximize legibility, improve the rhythm of readability and keep typographic color even. As a result 64-SRC is as well suited for extensive copy as it is display type.