I tried this fonts, all looks nice for 80 columns FORTRAN programs and data files:
Everson Mono Unicode-Regular.ttf
http://www.dafont.com/search.php?psize=m&q=everson
saxMono-Regular.ttf
http://www.dafont.com/saxmono.font
unispace bold italic.ttf
unispace bold.ttf
unispace italic.ttf
unispace.ttf
http://www.1001fonts.com/font_details.html?font_id=1136
Verily Serif Mono-Book.ttf
http://www.dafont.com/verily-serif-mono.font
Everson Mono Unicode-Regular.ttf
http://www.dafont.com/search.php?psize=m&q=everson
saxMono-Regular.ttf
http://www.dafont.com/saxmono.font
unispace bold italic.ttf
unispace bold.ttf
unispace italic.ttf
unispace.ttf
http://www.1001fonts.com/font_details.html?font_id=1136
Verily Serif Mono-Book.ttf
http://www.dafont.com/verily-serif-mono.font