Maintenance & Service Guide for Presario 1600 Series (Models 1683-1694)
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Troubleshooting Running POST To run POST, complete the following steps: Turn off the computer, then turn on the computer. If POST does not detect any errors, the computer will not beep. This indicates successful completion of POST test. POST has run successfully and boots from the hard drive (or from a bootable diskette if one is installed in the diskette drive). If POST detects errors, the errors are indicated by screen and/or audible messages. Refer to "Power-On Self-Test (POST) Codes" in the tables for a list of POST codes and their relevant descriptions.
NOTE: |
If the system is not functioning well enough to run POST, or if the display is not functioning well enough to show POST error messages, refer to the Troubleshooting tables. |
| NOTE: | The following routines are sorted by their test point numbers assigned in the BIOS code. Their actual orders as executed during POST can be quite different. |
Code |
Beeps |
POST Routine Description |
| 02h | Verify Real Mode | |
| 03h | Disable Non-Maskable Interrupt (NM) | |
| 04h | Get CPU type | |
| 06h | Initialize system hardware | |
| 08h | Initialize chipset with Initial POST values | |
| 09h | Set IN POST flag | |
| 0Ah | Initialize CPU registers | |
| 0Bh | Enable CPU cache | |
| 0Ch | Initialize caches to initial POST values | |
| 0Eh | Initialize I/O component | |
| 0Fh | Initialize the local bus IDE | |
| 10h | Initialize Power Management | |
| 11h | Load alternate registers with initial POST values | |
| 12h | Restore CPU control word during warm boost | |
| 13h | Initialize PCI Bus Mastering devices | |
| 14h | Initialize keyboard controller | |
| 16h | 1-2-2-3 | BIOS ROM Checksum |
| 17h | Initialize cache before memory autosize | |
| 18h | 8254 timer initialization | |
| 1Ah | 8237 DMA controller initialization | |
| 1Ch | Reset Programmable Interrupt Controller | |
| 20h | 1-3-1-1 | Test DRAM refresh |
| 22h | 1-3-1-3 | Test 8742 Keyboard Controller |
| 24h | Set ES segment register to 4 GB | |
| 26h | Enable A20 line | |
| 28h | Autosize DRAM | |
| 29h | Initialize POST Memory Manager | |
| 2Ah | Clear 512 KB base RAM | |
| 2Ch | 1-3-4-2 | RAM failure on address line xxxx* |
| 2Eh | 1-3-4-3 | RAM failure on data bits xxxx* of low byte of memory bus |
| 2Fh | Enable cache before system BIOS shadow | |
| 30th | 1-4-1-1 | RAM failure on data bits xxxx*of high byte memory bus |
| 32h | Test CPU bus-clock frequency | |
| 33h | Initialize Phoenix Dispatch Manager | |
| 36h | Warm start shut down | |
| 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 | 2-1-2-3 | 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 | |
| 50Eh | Display CPU type and speed | |
| 51h | Initialize EISA board | |
| 52h | Test keyboard | |
| 54h | Set key click if enabled | |
| 58h | 2-2-3-1 | 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 UserPatchI | |
| 66h | Configure advanced cache registers | |
| 67h | Initialize Multi Processor APIC | |
| 68h | Enable external and CPU cache | |
| 69h | Setup System Management Mode (SMM) area | |
| 6Ah | Display external L2 cache size | |
| 6Bh | Load custom defaults (optional) | |
| 6Ch | Display shadow-area message | |
| 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 | |
| 82h | Detect and install external RS232 ports |
|
| 83h | Configure non-MCD IDE controllers | |
| 84h | Detect and install external parallel ports | |
| 85h | Initialize PC-compatible PnP ISA devices | |
| 86h | Reinitialize onboard I/O ports | |
| 87h | Configure Motherboard Configurable Devices (optional) | |
| 88h | Initialize BIOS Data Area | |
| 89h | Enable Non-Maskable Interrupts (NMIs) | |
| 8Ah | Initialize Extended BIOS Data Area | |
| 8Bh | Test and initialize PS/2 mouse | |
| 8Ch | Initialize floppy controller | |
| 81h | Determine number of ATA drives (optional) | |
| 90h | Initialize hard disk controllers | |
| 91h | Initialize local-bus hard disk controllers | |
| 92h | Jump to UserPatch2 | |
| 93h | Build MPTABLE for multi-processor boards | |
| 95h | Install CD ROM for boot | |
| 96h | Clear huge ES segment register | |
| 97h | Fixup Multi Processor table | |
| 98h | 1-2 | Search for option ROMs. One long, two short beeps on checksum failure |
| 99h | Check for SMART drive (optional) | |
| 9Ah | Shadow option ROMs | |
| 9Ch | Set up Power Management | |
| 9Dh | Initialize security engine (optional) | |
| 9Eh | Enable hardware interrupts | |
| 9Fh | Determine number of ATA and SCSI drives | |
| A0h | Set time of day | |
| A2h | Check key lock | |
| A4h | Initialize Typematic rate | |
| A8h | Erase F2 prompt | |
| AAh | Scan for F2 key stroke | |
| ACh | Enter Setup | |
| AEh | Clear Boot flag | |
| B0h | Check for errors | |
| B2h | POST done - prepare to boot operating system | |
| B4h | 1 | One shot beep before boot |
| B5h | Terminate QuietBoot (optional) | |
| B6h | Check password (optional) | |
| 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 back up 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 interrupts |
| Code | Beeps | For Boost Block in Flash ROM |
| E0h | Initialize the chipset | |
| E1h | Initialize the bridge | |
| E2h | Initialize the CPU | |
| E3h | Initialize 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 interrupts vectors | |
| F1h | Initialize Run Time Clock | |
| F2h | Initialize Video | |
| F3h | Initialize beeper | |
| F4h | Initialize boot | |
| F5h | Clear Huge segment | |
| F6h | Boot to Mini DOS | |
| F7h | Boot to Full DOS |
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