| Code |
| Beeps | POST Routine Description |
|
|
|
|
|
B9h |
|
|
| Prepare Boot |
|
|
|
|
|
BAh |
|
|
| Initialize DMI parameters |
|
|
|
|
|
BBh |
|
|
| Initialize PnP Option ROMs |
|
|
|
|
|
BCh |
|
|
| Clear parity checkers |
|
|
|
|
|
BDh |
|
|
| Display MultiBoot menu |
|
|
|
|
|
BEh |
|
|
| Clear screen (optional) |
|
|
|
|
|
BFh |
|
|
| Check virus and backup reminders |
|
|
|
|
|
C0h |
|
|
| Try to boot with INT 19 |
|
|
|
|
|
C1h |
|
|
| Initialize POST Error Manager (PEM) |
|
|
|
|
|
C2h |
|
|
| Initialize error logging |
|
|
|
|
|
C3h |
|
|
| Initialize error display function |
|
|
|
|
|
C4h |
|
|
| Initialize system error handler |
|
|
|
|
|
C5h |
|
|
| PnPnd dual CMOS (optional) |
|
|
|
|
|
C6h |
|
|
| Initialize notebook docking (optional) |
|
|
|
|
|
C7h |
|
|
| Initialize notebook docking late |
|
|
|
|
|
C8h |
|
|
| Force check (optional) |
|
|
|
|
|
C9h |
|
|
| Extended checksum (optional) |
|
|
|
|
|
D2h |
|
|
| Unknown interrupt |
|
|
|
|
|
E0h |
|
|
| Initialize the chipset |
|
|
|
|
|
E1h |
|
|
| Initialize the bridge |
|
|
|
|
|
E2h |
|
|
| Initialize the CPU |
|
|
|
|
|
E3h |
|
|
| Initialize the system timer |
|
|
|
|
|
E4h |
|
|
| Initialize system I/O |
|
|
|
|
|
E5h |
|
|
| Check force recovery boot |
|
|
|
|
|
E6h |
|
|
| Checksum BIOS ROM |
|
|
|
|
|
E7h |
|
|
| Go to BIOS |
|
|
|
|
|
E8h |
|
|
| Set Huge Segment |
|
|
|
|
|
E9h |
|
|
| Initialize Multi Processor |
|
|
|
|
|
EAh |
|
|
| Initialize OEM special code |
|
|
|
|
|
EBh |
|
|
| Initialize PIC and DMA |
|
|
|
|
|
ECh |
|
|
| Initialize Memory type |
|
|
|
|
|
EDh |
|
|
| Initialize Memory size |
|
|
|
|
|
EEh |
|
|
| Shadow Boot Block |
|
|
|
|
|
EFh |
|
|
| System memory test |
|
|
|
|
|
F0h |
|
|
| Initialize interrupt vectors |
|
|
|
|
|
F1h |
|
|
| Initialize Run Time Clock |
|
|
|
|
|
F2h |
|
|
| Initialize video |
|
|
|
|
|
F3h |
|
|
| Initialize System Management Mode |
|
|
|
|
|
F4h |
| 1 |
| Output one beep before boot |
|
|
|
|
|
F5h |
|
|
| Boot to Mini DOS |
|
|
|
|
|
F6h |
|
|
| Clear Huge Segment |
|
|
|
|
|
F7h |
|
|
| Boot to Full DOS |
|
|
|
|
|
100 | Chapter 4 |
