Epson Apex 20020 - Manual (Page 189)

Re-insert the diskette and secure the lock. If no errors occur,
the menu reappears. An error occurs if the drive is
malfunctioning, or if you do not remove or replace the diskette
within a certain time.
Run All Above Checks
To run all the tests on the menu in sequence, press 6 and then
Enter. When you choose this option, all checks for the diskette
drive(s) and controller are performed automatically in
sequential order. Although you do not start each test, you must
still supply the appropriate responses to progress from one test
to the next.
Math Coprocessor Check (80287)
Use this option to check the operation of the 80287 math
coprocessor if you have one installed in your computer. To
check the math coprocessor, select option 7 from the DEVICE
LIST.
Before running any tests, the computer checks the settings in
CMOS RAM to ensure that a coprocessor is installed. If the
coprocessor is missing, or if you have not changed the setting in
CMOS RAM with the Setup option, an error occurs and the
test ends.
If the coprocessor is installed, the program then runs a series of
checks on the precision with which the coprocessor performs
calculations and handles exceptions.
Parallel Port (Printer Interface) Check
Use this option to test the operation of the secondary parallel
printer port. For example, you would select this option to test
the built-in port if you have assigned it as the secondary port,
or if you installed an option card that provides a parallel port.
Performing System Diagnostics C-25