Sigh. The stock photo they pulled for the article is a PC Jr, who's 30th birthday won't happen for another two and a half years. Come on, folks. If you're going to write this stuff at least get the details right and don't hand it off to a 22 year old intern who's never seen such a device.
The source code to the BIOS was printed in the back of the tech manual. Only later would people be sued for having read it, and then implemented it again.