Maintenance and Service Guide

Service Manual Troubleshooting and Diagnostics 3-23
Beep Codes POST Description
1-2-1-2
Load alternate registers with initial POST values
1-2-1-3
Restore CPU control word during warm boot
1-2-1-4
Initialize PCI Bus Mastering devices
1-2-2-1
Initialize keyboard controller
1-2-2-3 BIOS ROM checksum
1-2-2-4
Initialize cache before memory Auto size
1-2-3-1
8254 timer initialization
1-2-3-3
8237 DMA controller initialization
1-2-4-1
Reset Programmable Interrupt Controller
1-3-1-1 Test DRAM refresh
1-3-1-3 Test 8742 Keyboard Controller (on motherboard)
1-3-2-1
Set ES segment register to 4 GB
1-3-3-1
Auto size DRAM; or wrong type or no RAM installed
1-3-3-2
Initialize POST Memory Manager
1-3-3-3
Clear 512 KB base RAM
1-3-4-1 RAM failure on address line xxxx
1-3-4-3 RAM failure on data bits xxxx of low byte of memory bus
1-3-4-4 Enable cache before system BIOS shadow
1-4-1-1 RAM failure on data bits xxxx of high byte of memory bus
1-4-1-3
Test CPU bus-clock frequency
1-4-1-4
Initialize Phoenix Dispatch Manager
1-4-2-3
Warm start shut down
1-4-3-1
Shadow system BIOS ROM
1-4-3-3
Auto size cache
1-4-4-1
Advanced configuration of chipset registers
1-4-4-2
Load alternate registers with CMOS values
2-1-1-2
Initialize extended memory for ROMPilot
2-1-1-3
Initialize interrupt vectors
2-1-2-2
POST device initialization
2-1-2-3 Check ROM copyright notice
2-1-2-4 Initialize I20 support
2-1-3-1
Check video configuration against CMOS
2-1-3-2
Initialize PCI bus and devices
2-1-3-3
Initialize all video adapters in system
2-1-3-4
QuietBoot start (optional)
2-1-4-1
Shadow video BIOS ROM
2-1-4-3
Display BIOS copyright notice