@Carol- TRS-DOS is (was) the version of DOS that ran on Tandy computers (TRS-80 and the like) back when every computer maker had their own version of BASIC as well.
Look here: http://en.wikipedia.org/wiki/TRS-DOS-Edvard
Actually as soon as I saw the word Tandy it all came flooding back

As far as hardware goes, Linux is supported and is supporting more hardware every day. Consulting the home page of your manufacturer would be a good start, but then again you'd have to learn a whole new operating system...
I know that - I actually like Linux as an operating system but I have now tried umpteen different versions over the last 5 years and I have yet to find a single build that can install my hardware set. Almost every version has problems with the various printers I have had - even when they were
supported they didn't work properly but three models weren't even supported unless they were emulating an ancient Epson. Given that my main use for a printer is photography this was simply unacceptible. My current printer (a Canon iP5000 which is hardly obscure) isn't supported in any way at all.
I have a bog standard Canon flatbed scanner that just isn't supported.
My sound hardware (an Audigy 2) is supported but only in a very basic way
and it goes on ...
If/when Linux developers and hardware manufacturers start talking to each other I will probably have at least a dual booting system with Linux but until then Linux (for me) is a toy operating system that has lots of potential but no real benefit.
(Sorry I think I probably said all this before somewhere - not very well today so I am rambling!)