The Kaypro 2x was one of the last models Kaypro produced. Size and appearence were the same as the first Kaypro II, but Internal hardware was inspired by the Kaypro 10.
It came with a 4 MHz Z80A processor, dual slimline 400 KB floppy drives, a built-in 300 baud modem, two serial ports and a full set of Micropro software (WordStar, CalcStar, DataStar)
It is said that Arthur C. Clarke worked in the movie version of "2010: Odyssey Two", a sequel of "2001", using a Kaypro 2x and its built-in modem for transfering texts from Sri Lanka, where he lived, to Los Angeles.
Roy Miller specifies:_______________________
I own two. One looks like the machine you have (colors
of the original 2), and has the same equipment. The other doesn't have a
modem, and came in the same color scheme as the 4, 10, and 16.
The one in the older color scheme has a sticker with an "X" on it pasted just
after the "2" on the back. The dark grey one doesn't have that. It seems
clear that they used the older 2 cases as well as newer cases.
More info about the internal modem by David C. Oshel:
The internal modem didn't work with the software Kaypro provided, so you had to use a Hayes Smartmodem attached to a serial i/o port. The internal modem chip had a defect: One of its pinouts went low when the specs said it went high.
We put an oscilloscope on the pup and saw this for ourselves on the Beacon Microcenter (Ames, Iowa) workbench in 1983. I was able to write a driver that made it work, but nobody cared.