Epson 386SX - Manual (Page 209)

After checking
the character fonts, respond to the prompt:
Is the display correct ? (Y/N)
If the characters match the illustration, select
Y.
If you find a
problem with the characters on the screen, select N to display
the error message.
40-column Character Set Check
To check your 40-column character set, select 4. The character
fonts that are included in the internal character generator are
displayed on your screen. Compare the characters on your
screen to the following illustration.
Is the display correct ? (Y/N)
After checking the character fonts, respond to the prompt:
Is the display correct ? (Y/N)
Performing System Diagnostics C-17