Gigabyte GA-486AM User Manual page 54

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F Test DMA Controller 0
10 Test DMA Controller 1
11 Test DMA Page
registers
12-13 Reserved
14 Test Timer Counter 2
15 Test 8259-1 Mask Bits
16 Test 8259-2 Mask Bits
17 Test Stuck 8259's
Interrupt Bits
18 Test 8259 Interrupt
Functionality
19 Test Stuck NMI Bits
(Parity/IO Check)
1A
1B-1E Reserved
20 Enable Slot 0
21-2F Enable Slots 1-15
30 Size Base and
Extended Memory
31 Test Base and
Extended Memory
33-3B Reserved
3C Setup Enabled
3D Initialize & Install
Mouse
3E Setup Cache Controller
3F Reserved
BF Chipset Initialization
40
41 Initialize Floppy Drive &
Controller
42 Initialize Hard Drive &
Controller
43 Detect & Initialize
Serial/Parallel Ports
44 Reserved
45 Detect & Initialize Math
Coprocessor
46 Reserved
47 Reserved
48-4D Reserved
4E Manufacturing POST
Loop or Display
Messages
4F Security Check
50 Write CMOS
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B-2
BIOS checksum test.
Keyboard detect and initialization.
Test DMA Page Registers.
Test 8254 Timer 0 Counter 2.
Verify 8259 Channel 1 masked interrupts by alternative
turning off and on the interrupt lines.
Verify 8259 Channel 2 masked interrupts by alternative
turning off and on the interrupt lines.
Turn off interrupts then verify no interrupt mask register is
on.
Force an interrupt and verify the interrupt occurred.
Verify NMI can be cleared.
Display CPU clock.
Initialize slot 0 (System Board).
Initialize slot 1 through 15.
Size base memory from 256 K to 640 K extended memory
above 1 MB.
Test base memory from 256 K to 640 K and extended
memory above 1 MB using various patterns.
This will be skipped in EISA mode and can be "skipped"
with ESC key in ISA mode.
Detect if mouse is present, initialize mouse, install
interrupt vectors.
Initialize cache controller.
Program chipset registers with Setup values.
Display virus protest disable or enable.
Initialize floppy disk drive controller and any drives.
Initialize hard drive controller and any drives.
Initialize any serial and parallel ports (also game port).
Initialize math coprocessor.
Reboot if Manufacturing POST Loop pin is set. Otherwise
display any messages (i.e., any non-fatal errors that were
detected during POST) and enter Setup.
Ask password security (optional).
Write all CMOS values back to RAM and clear screen.
Appendix B:Post Codes