34
5
Blank video, Initialize
keyboard
Keyboard controller initialization.
6
Reserved
7
Test CMOS Interface and
Battery Status
Verifies CMOS is working correctly, detects bad
battery.
BE
Chipset Default
Initialization
Program chipset registers with power on BIOS
defaults.
C1
Memory presence test
OEM Specific-Test to size on-board memory.
C5
Early Shadow
OEM Specific-Early Shadow enable for fast boot.
C6
Cache presence test
External cache size detection.
8
Setup low memory
Early chip set initialization.
Memory presence test.
OEM chip set routines.
Clear low 64K of memory.
Test first 64K memory.
9
Early Cache
Initialization
Cyrix CPU initialization.
Cache initialization.
A
Setup Interrupt Vector Table Initialization first 120 interrupt vectors with
SPURIOUS_INT_HDLR and initialize INT 00h-1Fh
according to INT_TBL
B
Test CMOS RAM Checksum
Test CMOS RAM Checksum, if bad, or insert key
pressed, load defaults.
C
Initialize keyboard
Detect type of keyboard controller (optional) Set
NUM_LOCK status.
D
Initialize Video Interface
Detect CPU clock.
Read CMOS location 14h to find out type of video in
use.
Detect and Initialize Video Adapter.
E
Test Video Memory
Test video memory, write sign-on message to
screen.
Setup shadow RAM.Enable shadow according to
Setup.
F
Test DMA Controller 0
BIOS checksum test.
Keyboard detect and initialization.
10
Test DMA Controller 1
11
Test DMA Page Registers
Test DMA Page Registers.
12-13 Reserved
14
Test Timer Counter 2
Test 8254 Timer 0 Counter 2.
15
Test 8259-1 Mask Bits
Verify 8259 Channel 1 masked interrupts by
alternately turning off and on the interrupt lines.
16
Test 8259-2 Mask Bits
Verify 8259 Channel 2 masked interrupts by
alternately turning off and on the interrupt lines.
