"Prometheus" is meant to be a prequel to "Alien", happening 30 years before (src).
If that's the case, how come one of the very earliest spaceships, Prometheus from 2089, has a spiffy new technology, while Nostromo has antique text based CRTs, mechanical IBM style keyboards, and all the associated technologies screaming "1980s called, and they want their IBM PC back!" ?
The great visuals of this can be seen in this Youtube Video here (ignore the russian voice-over - the guy is a movie critic who is complaining pretty much of the same discrepancy listed above).
Please note that I'm looking ONLY for in-universe answers (movies, scripts, explanations from creative team). I'm utterly un-interested in the obvious out of universe "well, for 1979 Alien film, 1980s technologies was the future, and 2012 movie is expected to look futuristic in 2012, duh" or speculations that make sense but aren't confirmed in canon.
And for those who don't believe me... to quote the immortal quip from Men in Black 2:
Old and busted: