None of those companies have gone bust though. RCA got purchased and integrated by/into GE, Kodak filed bankruptcy but still exists with a significant number of employees, Tektronix is currently a fortune 500 company, Novell is now owned by Micro Focus, Lotus was never that big of a company, but they still exist and are doing pretty poor but still sell cars, AOL still exists and is owned by Yahoo, MySpace still exists and is owned by an advertising company and the other 2 or 3 I've never heard of.
The Lotus that the GP refers to is probably Lotus Development Corporation / Lotus Software, the makers of the hugely popular Lotus 1-2-3 spreadsheet from the 80s. It's still around-ish: it was owned by IBM until 2017 then was sold to the Indian company HCL Technologies for $1.8 billion. Pretty good for a company thought to be two decades obsolete!
Zilog was the maker of the Z80 microprocessor that powered a huge number of games consoles and simple computers in the 80s. Also still around - its parent company was acquired for $750 million.
I had to look up Curtis-Mathis because it wasn't a thing in the UK.
And MicroPro / WordStar International does seem to be legitimately dead: acquired by SoftKey who were acquired by Mattel who have since gotten rid of all the associated brands.
Yeah, I know they didn't literally go bust, some company always winds up buying the remaining value in the company, as its trademarks and IP have value.
But in any practical sense, they ceased to exist. (I meant Lotus of 1-2-3 fame, not car fame.)
