Epson Y16499100301 - Manual (Page 109)

Note
This option does not check expanded memory above the
640KB memory limit imposed by MS-DOS.
For this check, the program writes specific data into
memory and then reads it back. The data is written and read
in blocks of 64KB. A parity check is also made on each block.
A memory count is displayed after each block that is tested
without an error. The final message is usually:
640 KB OK
If
an error is reported, write down the error code and
message, or print them out, and contact your Epson dealer.
Attempting to correct memory errors yourself may violate your
warranty agreement.
Keyboard Check
Use this option to check the operation of the keyboard.
The program first checks the keyboard controller; during this
check, you see the indicator lights above the keyboard flash. If
no errors are detected, you can then choose the correct
keyboard layout.
Before checking the operation of the keys, you must select
the appropriate keyboard layout so that the test display
matches the keys on your keyboard. You see this menu:
KEYBOARD SELECT MENU
1 - US ASCII
2 - United Kingdom
3 - French
4 - German
5 - Italian
6 - Spanish
0 - Exit
Enter selection number:
Performing System Diagnostics
D-5