|
|
| Appendix B: BIOS POST Codes | |
|
|
|
|
|
| POST (hex) |
| Description | |
|
|
|
| |
| 80h | Reserved |
| |
| 81h | Reserved |
| |
| 82h | 1. | Call chipset power management hook. |
|
|
| 2. | Recover the text font used by EPA logo (not for full screen logo) |
|
|
| 3. | If password is set, ask for password. |
|
| 83h | Save all data in stack back to CMOS |
| |
| 84h | Initialize ISA PnP boot devices |
| |
| 85h | 1. | USB final Initialization |
|
|
| 2. | NET PC: Build SYSID structure |
|
|
| 3. | Switch screen back to text mode |
|
|
| 4. | Set up ACPI table at top of memory. |
|
|
| 5. | Invoke ISA adapter ROMs |
|
|
| 6. | Assign IRQs to PCI devices |
|
|
| 7. | Initialize APM |
|
|
| 8. | Clear noise of IRQs. |
|
| 86h | Reserved |
| |
| 87h | Reserved |
| |
| 88h | Reserved |
| |
| 89h | Reserved |
| |
| 90h | Reserved |
| |
| 91h | Reserved |
| |
| 92h | Reserved |
| |
| 93h | Read HDD boot sector information for Trend |
| |
| 94h | 1. | Enable L2 cache |
|
|
| 2. | Program boot up speed |
|
|
| 3. | Chipset final initialization. |
|
|
| 4. | Power management final initialization |
|
|
| 5. | Clear screen & display summary table |
|
|
| 6. | Program K6 write allocation |
|
|
| 7. | Program P6 class write combining |
|
| 95h | 1. | Program daylight saving |
|
|
| 2. | Update keyboard LED & typematic rate |
|
| 96h | 1. | Build MP table |
|
|
| 2. | Build & update ESCD |
|
|
| 3. | Set CMOS century to 20h or 19h |
|
|
| 4. | Load CMOS time into DOS timer tick |
|
|
| 5. | Build MSIRQ routing table. |
|
| FFh | Boot attempt (INT 19h) |
| |
|
|
|
|
|
