BIOS POST Codes - Page 2 of 6
| Code | LED Display | Description |
| 20h |  |
The base 64 KB memory test has been started. The address line test is to be done next. |
| 21h |  |
The address line test passed. Toggling parity next. |
| 22h |  |
The parity toggle has been completed. Performing a sequential data read/write test next. |
| 23h |  |
The base 64 KB sequential data read/write test passed. Performing any necessary system initialization before interrupt vector initialization. |
| 24h |  |
The system configuration required before vector initialization has been completed. Interrupt vector initialization is about to begin. |
| 25h |  |
Interrupt vector initialization is done. Reading the input port of the 8042 for the turbo switch setting (if any). |
| 26h |  |
The input port of the 8042 has been read. Initializing global data for the turbo switch. |
| 27h |  |
Global data initialization is done. Initialization after the interrupt vector initialization will be done next. |
| 28h |  |
Initialization after interrupt vector initialization is completed. Setting monochrome mode next. |
| 29h |  |
Monochrome mode is set. Setting color mode next. |
| 2Ah |  |
Color mode is set. Toggling parity before the optional Video ROM test next. |
| 2Bh |  |
Parity toggle completed. About to do any system initialization required before the video ROM check. |
| 2Ch |  |
Initialization before video ROM control is done. Looking for video ROM next. Control passed to video ROM next. |
| 2Dh |  |
The video ROM check is done. Next, do processing after the video ROM returns control. |
| 2Eh |  |
Finished processing after the video ROM had control. If an EGA or VGA adapter is not found, the display memory read/write test is next. |
| 2Fh |  |
No EGA or VGA adapter has been found. The display memory read/write test is about to begin. |
| 30h |  |
The display memory read/write test passed. About to look for retrace check. |
| 31h |  |
The display memory read/write test or retrace check failed. About to perform the alternate display memory read/write test. |
| 32h |  |
The alternate display memory read/write test passed. About to look for alternate display retrace checking. |
| 33h |  |
The video display check is completed. Verification of the display type with switch setting and the actual adapter card is next. |
| 34h |  |
Verification of the display adapter is done. The display mode is set next. |
| 35h |  |
The display mode has been set. The BIOS ROM data area is about to be checked. |
| 36h |  |
The BIOS ROM data area check is completed. Setting the cursor for the Power-On message next. |
| 37h |  |
Cursor setting for the Power-On message is done. Displaying the Power-On message next. |
| 38h |  |
The Power-On message has been displayed. Reading the new cursor position next. |
| 39h |  |
The new cursor position has been read and saved. Displaying the BIOS Identification String next. |
| 3Ah |  |
The BIOS Identification String has been displayed. Displaying the OHit <DEL>...O message next. |
| 3Bh |  |
The OHit <DEL> ...O message has been displayed. The virtual mode memory test is about to start. |
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