Epson 486SX - Manual (Page 187)

Starting System Diagnostics
To run the System diagnostics program, you turn on or reset
your computer with the Reference diskette in drive A. If you
start the program in any other way, some tests may produce
strange results.
To start the System diagnostics program, follow these steps:
1. Insert the Reference diskette in drive A.
2. Turn on or reset the computer. The Operation Menu appears.
3. If the
Num Lock
indicator is illuminated, press to turn
off the function.
4. Press or use to select System diagnostics and then
press
When you start the System diagnostics program, the computer
checks any peripheral devices connected to the system. Then
you see a list of the devices available for testing. This list
includes only the devices that are currently installed, for
example:
DEVICE LIST
1 - System board
2 - Memory
3 - Keyboard
5 - Color graphics adapter and CRT
6 - Diskette drives and controller
9 - Parallel
port (printer interface)
11 - Serial port (RS-232C port)
14 - Dot-matrix printer
17 - Hard disk drives and controller
DEVICE LIST is correct ? (Y/N)
C-2 Performing System Diagnostics