Epson 386SX - Manual (Page 122)

The screen displays a tree diagram of the subdirectories of the
current directory, for example:
C
: \
L E D G E R
RECEIV
PAYABL
SALES
SALE1989
SALE1990
To see a list of all the files in the subdirectories, add the /F
switch, like this:
TREE /F
The screen displays the directory information shown above and
the names of all the files in each subdirectory:
C : \ L E D G E R
NOVRECV
DECRECV
NOVSALES.RPT
DECSALES.RPT
JANSALES
FEBSALES
MARSALES
4-26 Using MS-DOS with Your Equity 386SX