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 Check

Use this option to check the operation of the 80387 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 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 primary parallel printer port. To perform the test, you must insert a special loop-back connector into the parallel port so that the computer can check 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.

When you select option 9 from the DEVICE LIST, you see these prompts:

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.

C-22 Performing System Diagnostics