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.