Tandy 2000 is an MS-DOS machine, but NOT PC-DOS.  (720K 5.25", etc.)
On Wed, 29 Jun 2016, Swift Griggs wrote:
  Doesn't look like the same type of system, but
just for grins, I saw this
 TRS-80 Model 4 on my local Craigslist:
 
http://denver.craigslist.org/sys/5659348181.html 
TRS-80 Model 4 is replacement for the model 3.  Z80, runs TRS-DOS of
various sorts, but ALSO (unlike the 3) runs CP/M
The Model 4P, if you can find one, is basically the same, but converted
into a luggable.
aka "Convertible".  8088 laptop with 720K 3.5" drives