Epson 386SX - Manual (Page 205)

Attribute Check
To check the display attributes of the adapter card, select 2.
Several messages appear showing examples of all the possible
display attributes (normal intensity, high intensity, blinking,
reverse, and underlining). Check the information that appears
on your screen, and then respond to the prompt:
Is the display correct ? (Y/N)
Select
Y
if the display is correct. If the display attributes are not
correct, adjust the brightness and contrast on your monitor. If
they are still incorrect, select
N.
Character Set Check
To check your character set, select 3. The character fonts that
are included in the internal character generator appear on your
screen. Compare your screen display to this illustration:
MONOCHROME ADAPTER CHECK
CHARACTER SET CHECK
Is the display correct ? (Y/N)
Performing System Diagnostics C - 1 3