
| Code | Beeps | POST Routine Description | 
| 
 | 
 | 
 | 
| 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 | 
| 
 | 
 | 
 | 
| 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 User Patch1 | 
| 
 | 
 | 
 | 
| 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 I/O ports and | 
| 
 | 
 | IRQs | 
| 
 | 
 | 
 | 
| 81h | 
 | Late POST device initialization | 
| 
 | 
 | 
 | 
| 98 | Chapter 4 |