System Board Check

Use this option to check the operation of each major component on the system board, including:

•The 80286 CPU chip

•The system ROM

•The real-time clock, CMOS RAM, and battery

•The main integrated circuits.

The checks made on the 80286 CPU chip are very comprehensive and ensure that the CPU instruction set, including protected-mode operation, is functioning correctly. If an error occurs, write down the error message, or print it out, and contact your Epson dealer. Attempting to correct system board errors yourself may violate your warranty agreement.

Memory Check

Use this option to check the memory installed in your computer, including expansion memory.

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:

000640KB OK

If an error occurs, write down the error message, or print it out, and contact your Epson dealer. Attempting to correct memory errors yourself may violate your warranty agreement.

Note

Extended memory above 640KB, which is normally not available to MS-DOS, is checked using the protected mode of the 80286 CPU chip.

D-6 Performing System Diagnostics