Math Coprocessor (80287) Check

Use this option to check the operation of the 80287 math coprocessor if you have one installed in your computer. To start the test, select option 7 from the DEVICE LIST menu.

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 reset the CMOS RAM with the setup program, an error occurs and the test ends.

If the coprocessor is installed, the program 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 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 that a different connector is required to test the serial port.

Note

If you connect a parallel printer cable instead of a loop-back connector, you will get errors.

When you select option 9 from the DEVICE LIST menu, you see this message:

PARALLEL PORT CHECK

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

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