Compaq Presario 1246 Maintenance & Service Manual page 56

"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models: 1246, 1277, 1278, and 1279
Code Beeps
02h
03h
04h
06h
08h
09h
0Ah
0Bh
0Ch
0Eh
0Fh
10h
11h
12h
13h
14h
1-2-2-3
16h
17h
18h
1Ah
1Ch
20h 1-3-1-1
1-3-1-3
22h
24h
26h
28h
29h
2Ah
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...SERIES%201246%201277%201278%201279/power1.html (2 of 7)6/27/2004 2:33:47 AM
POST Routine Description
Verify Real Mode
Disable Non-Maskable Interrupt (NM)
Get CPU type
Initialize system hardware
Initialize chipset with Initial POST values
Set IN POST flag
Initialize CPU registers
Enable CPU cache
Initialize caches to initial POST values
Initialize I/O component
Initialize the local bus IDE
Initialize Power Management
Load alternate registers with initial POST values
Restore CPU control word during warm boost
Initialize PCI Bus Mastering devices
Initialize keyboard controller
BIOS ROM Checksum
Initialize cache before memory autosize
8254 timer initialization
8237 DMA controller initialization
Reset Programmable Interrupt Controller
Test DRAM refresh
Test 8742 Keyboard Controller
Set ES segment register to 4 GB
Enable A20 line
Autosize DRAM
Initialize POST Memory Manager
Clear 512 KB base RAM