BOX  1.4 - like ECHO, except also draws a box around the
text May be freely distributed for non-military use only.
MASM/OPTAsm source included.  Usage:

BOX    Please insert the yellow diskette.

Leading and trailing blanks are removed from the string and one
blank is added to each end.  The result on the screen is:

+------------------------------------+
| Please insert the yellow diskette. |
+------------------------------------+

Except it will look better because BOX uses the IBM line drawing
set.  Version 1.4 allows you to change the left
margin if you reassemble.