using old or vintage machinery, equipment, software, etc., either pragmatically or as a hobby. The "Computer Desktop Encyclopedia" at computerlanguage.com claims this is synonymous with retrocomputing and compares that term with steampunk.
Urbandictionary.com has: Retrotech high tech aesthetic circa pre-1987. I prefer to use Casio keyboards because they are so retrotech.retroretro-techhi-firelickitsch
All interesting, but really I just like the groovy, fab images below