Toshiba PORTEGE M400 Maintenance Manual page 68

2 Troubleshooting
5. Execute GETDPORT.COM in the text menu in CPU REAL mode. (Insert the FD for
starting D port into FDD and input "FD starting drive:>dport".)
The D port status is displayed in the following form;
6. When the D port status is FFFFh (normal status), go to Procedure 3.
7. When the D port status falls into any status in Table 2-3, execute Check 1.
2-20 [CONFIDENTIAL]
2.4 System board Troubleshooting
PORTEGE M400 Maintenance Manual (960-541)