[ltp] r50e: ttyS0 is a NS16550A

[James Knott]

Noah Dain wrote:

> if you go the usb->rs232 adaptor route, get a keyspan.  they support
> linux, and are generally known to work where other usb->rs232 adaptors
> fail.
> 
> http://www.keyspan.com/
> 
> once i got a keyspan, all the weirdness I had with other usb adaptors vanished.

The first adapter I tried didn't work with Linux.  It didn't work with
Windows either.  ;-)

I even tried a few examples of that one brand in the store and none of
them worked.

The 2nd brand I tried worked fine in both Linux and Windows.