The checks made on the 8088 CPU chip are extremely comprehensive. They ensure that the CPU instruction set is functioning correctly.

If an error is reported, write down the error code and message, or print them out, and contact your Customer Care Center. Attempting to correct system board errors yourself may violate your warranty agreement.

Memory Check

Use this option to check the computer’s built-in memory. The program checks the DIP switches to determine the amount of main memory. If any settings are incorrect, check the DIP switches to make sure they match the installed memory.

Note

This option does not check expanded memory above the 640KB memory limit imposed by MS-DOS.

For this check, the program writes specific data into memory and then reads it back. The data is written and read in blocks of 64KB. A parity check is also made on each block. A count of memory is displayed after each block that is tested without an error. The final message is usually:

640 KB OK

If an error is reported, write down the error code and message, or print them out, and contact your Customer Care Center. Attempting to correct memory errors yourself may violate your warranty agreement.

D-8 Performing System Diagnostics