Introduction: 
This computer was made in 1989, but different versions of the Tandy 1000
stretch as far back as 1984.
When the first version of the Tandy 1000 came out, it was based on a
computer made earlier, the PC JR. 
The PC JR did very poorly, but the Tandy 1000 did very well.
It was one of the first computers to include Video and Sound support. 
Another feature that the Tandy 1000 TL/2 (i'm not sure if it came with
the original Tandy 1000)  had was important software built into ROM.
This was good since it allowed software to load much faster then from Disk.
Information stored in ROM was kept even after the computer was turned off.
MS-DOS (Microsoft Disk Operating System) and the main part of DeskMate
were in ROM.
The computer launched into DeskMate almost immediately after startup. 
The Tandy 1000 TL/2 was compatible for programs made for the IBM PC and
the PC/XT so it could run most of the popular software at the time. 
The rest of this writing refers to the Tandy 1000 TL/2, and other versions
of the Tandy 1000 will be different from this. 

Processor: (80286 chip) 
The computer has a dual speed processor, which runs at 8MHz and 4MHz.
This was due to the fact that some older programs at the time didn't run
correctly at 8MHz and required a slower speed.
Any software that you can still find for the Tandy today should be run
at 8MHz, and going to 4MHz is something that you probably never will
need to do.

(meltingpot.fortunecity.com/andorra/937/tandy1000tl2.html)
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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)