Bios Post Code - TYAN Thunder K8WE S2895 User Manual

4.3 BIOS Post Code

Code Beeps / Description
02h Verify Real Mode
03h Disable Non-Maskable
Interrupt (NMI)
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 boot
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 KBD
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 1-3-4-1. RAM failure on
address
Code
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
50h 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 UserPatch1
66h Configure advanced cache
registers
58
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Beeps / Description