Code | Beeps | POST Routine Description |
|
|
|
38h |
| Shadow system BIOS ROM |
3Ah |
| Autosize cache |
|
|
|
3Ch |
| Advanced configuration of chipset registers |
|
|
|
3Dh |
| Load alternate registers with CMOS values |
|
|
|
42h |
| Initialize interrupt vectors |
|
|
|
45h |
| POST device initialization |
|
|
|
46h | Check ROM copyright notice | |
|
|
|
48h |
| Check video configuration against CMOS |
|
|
|
49h |
| Initialize PCI bus and devices |
|
|
|
4Ah |
| Initialize all video adapters in system |
|
|
|
4Bh |
| QuietBoot start (optional) |
|
|
|
4Ch |
| Shadow video BIOS ROM |
|
|
|
| Code | Beeps | POST Routine Description |
|
|
|
|
|
|
| 4Eh |
| Display BIOS copyright notice |
|
| 50h |
| Display CPU type and speed |
|
|
|
|
|
|
| 51h |
| Initialize EISA board |
|
|
|
|
|
|
| 52h |
| Test keyboard |
|
|
|
|
|
|
| 54h |
| Set key click if enabled |
|
|
|
|
|
|
| 58h | Test for unexpected interrupts |
| |
|
|
|
|
|
| 59h |
| Initialize POST display service |
|
|
|
|
|
|
| 5Ah |
| Display prompt "Press F2 to enter SETUP" |
|
|
|
|
|
|
| 5Bh |
| Disable CPU cache |
|
|
|
|
|
|
| 5Ch |
| Test RAM between 512 and 640 KB |
|
|
|
|
|
|
| 60h |
| Test extended memory |
|
|
|
|
|
|
| 62h |
| Test extended memory address lines |
|
|
|
|
|
|
| 64h |
| Jump to UserPatch1 |
|
|
|
|
|
|
| 66h |
| Configure advanced cache registers |
|
|
|
|
|
|
| 67h |
| Initialize Multi Processor APIC |
|
|
|
|
|
|
| 68h |
| Enable external and CPU caches |
|
|
|
|
|
|
| 69h |
| Setup System Management Mode (SMM) area |
|
|
|
|
|
|
| 6Ah |
| Display external L2 cache size |
|
|
|
|
|
|
| 6Bh |
| Load custom defaults (optional) |
|
|
|
|
|
|
| 6Ch |
| Display |
|
|
|
|
|
|
| 6Eh |
| Display possible high address for UMB recovery |
|
|
|
|
|
|
| 70h |
| Display error messages |
|
|
|
|
|
|
| 72h |
| Check for configuration errors |
|
|
|
|
|
|
| 76h |
| Check for keyboard errors |
|
|
|
|
|
|
| 7Ch |
| Set up hardware interrupt vectors |
|
|
|
|
|
|
| 7Eh |
| Initialize coprocessor if present |
|
|
|
|
|
|
| 80h |
| Disable onboard Super USB ports and IRQs |
|
|
|
|
|
|
| 81h |
| Late POST device initialization |
|
|
|
|
|
|
| 82h |
| Detect and install external RS232 ports |
|
|
|
|
|
|
|
|
|
|
|
162 | Chapter 4 |
