My friends parents used to clean a business on the weekends, and as kids we got dragged along, but we had permission to play games on one of the office computers.
It was an unassuming 286 running DOS, but it had a modem and a couple bulletin boards in the phonebook.
Prince of Persia was one of the games we played the most. Paired with a Soundblaster and a small set of speakers, playing that game in a dark office was a great experience.
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