Epson Equity Ie Q50188015-1 - Manual (Page 103)

Run all above checks
To run all the tests on the menu in sequence, press 4 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 (8087) Check
Use this option to check the operation of the 8087 math coprocessor if you
have one installed in your computer.
To
start the test, select option 7 from the DEVICE LIST menu. The
program runs a series of checks on the precision with which the coprocessor
performs calculations and handles exceptions, and reports any errors that
occur,
Parallel Port (Printer Interface) Check
Use this option to test the operation of the computer’s primary parallel port.
To perform the test, you must insert a special loop-back connector into the
parallel port so that the computer can check the individual pins of the port.
Contact your dealer if you need a loop-back connector.
Note
If you connect a parallel printer cable instead of a loop-back connector, you
will get errors. Also, you need a different loop-back connector to test the
serial port.
When you select option 9 from the DEVICE LIST menu, you see this
message:
Attach loop-back connector to parallel port.
Enter Y to start this check when connector is
attached, or
Enter N to return to the menu.
Performing
System Diagnostics D-15