When you choose this option, all checks for the floppy disk 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 nest.

Math Coprocessor Check (8087)

Use this option to check the operation of the 8087 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 DIP switch 1 - 2 on the front panel to ensure that a coprocessor is installed. If the coprocessor is missing, or if you have not set DIP switch 1-2 correctly, an error occurs and the test ends.

The program then runs a series of checks to test the precision with which the coprocessor performs calculations and to detect whether it correctly handles exceptions. The program reports any errors that occur.

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 have installed an IBM@ parallel port option card.

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 ? from the DEVICE LIST, you see these prompts:

A t t a c h l o o p - b a c k c o n n e c t o r t o p a r a l l e l p o r t . Enter Y to start this check when connector is attached, or

Enter N to return to the menu.

Insert the loop-hack connector. Then press Y and Enter to start the check.

The computer checks the port by writing and reading data and control information, and reports errors for any pins that are faulty. Note that if you connect a printer cable instead of a loop-back connector, you will get errors.

5-21