This is one of a series of five machines in the following flavors:
1000, 1000 EX, 1000 HX, 1000RL, and 1000 SX.

This 1000EX has been built in 1985.
CPU is the INTEL 8088 at 4.77 or 7.16 (turbo) Mhz. RAM: 256 kB.
(640 kB. max.).
ROM (including BASIC) unknown.
Resolution: text: 80x25, graphical: 640x200. OS: MS DOS: 2.1 I/O:
1x parallel, 1x RGB, 1x Video, 1x Audio, 1x extension port, 1x headphones.
5.25 " 360 kB. FDD.

(www.digidome.nl)
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The Tandy 1000 was intended to be a low priced PCjr clone.
Instead it rivaled it, lasting longer then the PCjr by nearly a decade.
With enhanced graphics, and a 3 voice DAC, it was a turning point in
computer history. 
While at the the time the big thing was MS-DOS compatibility and not
PC compatability, their main focus was being able to run MS-DOS while
industry standards eventually adopted PC compatibility instead.

There were several different programs made to exploit the built in
abilities of the Tandy series, in several different categories. 
In the graphics viewing/converting section there is CShow 2000, able to 
view and convert GIFs, JPEGs, BMPs, PCXs, and more. In the game section, 
Sierra used both the sound and graphics abilities to enhance their games. 
Some of their best games were the "Quest" series, like "King's Quest" and 
"Space Quest". Then there is DeskMate by Tandy, before Windows, it was the
thing to have. 
Much like Win 3.0 it had a Graphics Program, Telecom, Text editor, 
Clipboard, and a few other handy apps. 

(www.wcnet.org/~royals/t1000.htm)