Oddball question: really small terminals

[Fred Cisin]

On Sat, 24 Oct 2015, Cindy Croxton wrote:
> How small is "really small"? IBM made a terminal with a 5" screen for 
> the 4704 banking systems. http://frente-cajas.blogspot.com/

And the Atari Portfolio runs a version of DR-DOS.
And the Poqet ran MS-DOS.

Both have serial ports available.
Both will run DOS software, including most of the undocumented calls, such 
as TSRs.
Either can function as a terminal.