BIOS POST Codes - Page 6 of 6
Code | LED Display | Description |
C2 | ![]() |
NMI is disabled. Power on delay is starting. |
C5 | ![]() |
Power on delay is completed. Disabling cache if any. |
C6 | ![]() |
Calculating the ROM BIOS checksum. |
C7 | ![]() |
ROM BIOS checksum passed. CMOS shutdown register test is to be performed next. |
C8 | ![]() |
CMOS shutdown register test is complete. The CMOS checksum calculation to be done next. |
CA | ![]() |
CMOS checksum calculation is done, CMOS DIAG byte is written. Next, the CMOS status register is initialized for Date and Time. |
CB | ![]() |
CMOS initialization is complete. Any initialization required before the keyboard BAT is performed next. |
CD | ![]() |
A BAT command to the keyboard controller is to be issued. |
CE | ![]() |
The keyboard BAT result was verified. Any initialization required after the keyboard controller BAT is performed next. |
CF | ![]() |
Initialization after the keyboard controller BAT is complete. A keyboard controller command byte code is to be written next. |
D0 | ![]() |
The system configuration is displayed. |
D1 | ![]() |
The keyboard controller command byte has been written. To check the INS key when pressed during power on. |
D2 | ![]() |
Check of INS key when pressed during power on was done. To disable DMA and Interrupt controllers. |
D3 | ![]() |
DMA controller #1 and #2 disabled. Interrupt controller #1 and #2 disabled. Chipset initialization and auto memory detection about to begin. |
D4 | ![]() |
Chipset initialization and auto memory detection are done. To decompress the RUNTIME code. |
D5 | ![]() |
The RUNTIME code is decompressed. |
DD | ![]() |
Transferring control to decompressed code in shadow RAM at F000:FFF0. |
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