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POST #
1A-1E
20-2F
33-3C
3F-40
48-4C
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Designation
17
Test Struck 8259's Interrupt Bits
18
Test 8259 Interrupt functionality
19
Test Struck NMI Bits (Parity/ IO
check)
Reserved
1F
Set EISA Mode
Enable Slots 0-15
Size Base & Extended Memory
30
31
Test Base & Extended Memory
32
Test EISA Extended Memory
Reserved
3C
Setup Enable
3D
Initialize & Install PS/2 Mouse
3E
Setup Cache Controller
Reserved
41
Initialize Floppy Drive &
Controller
42
Initialize Hard Drive & Controller
43
Detect & Initialize
Serial/Parallel/Joystick ports
44
Reserved
Detect & Initialize Math
45
Coprocessor
46
Reserved
47
Set Speed for Boot
Reserved
4D
Init. PC-Speaker to LINE OUT
4E
Manufacturing POST Loop or
display Messages
4F
Security Check
50
Write CMOS
Description
Nothing
Force an interrupt and verify that the interrupt occurred (IRQ 0 -
clock int. 8h).
Nothing.
Reserved
If EISA non-volatile memory checksum is good, execute EISA
initialization. If no, execute ISA test and clear EISA mode flag. Test
EISA Configuration Memory integrity (checksum & communication
interface).
Initialize slot 0 (System Board) to slot 15.
Size base memory from 256K to 640K and extended memory above
1MB.
1.
Test base memory from 256K to 640K and extended memory
above 1MB using various patterns.
2.
The last test is filling memory with 0's.
3.
On a quick memory test or if user press the ESC key while
testing memory, only the last test is performed.
If EISA Mode flag is set, then test EISA memory found in slots
Initialization.
NOTE 1: This will be skipped in ISA mode.
NOTE 2: This POST also Detect & Report I/O PORTS and also Init.
Super IO.
Reserved
Detect if mouse is present. Initialize mouse. Install interrupt vector.
Initialize cache controller.
Reserved
1.
Verify if we should enter
Boot Block in EMERGENCY :
setup. If so, enter setup.
Scan for Floppy for emergency
2.
Initialize floppy disk drive
disk...
controller and any drive.
Initialize hard drive controller and any drive. (Call HD_INSTALL).
Initialize any serial, parallel and game ports.
Reserved
Initialize Math Coprocessor.
Reserved
Set Speed for Boot.
Reserved
Enable access to PC-Speaker to LINE OUT and Enable/Disable it.
(T934).
1.
Reboot if Manufacturing POST Loop pin is set.
2.
Otherwise display any messages (i.e., any non-fatal errors
that were detected during POST).
3.
Enter SETUP if needed.
Ask password security if needed.
Write all CMOS values back to CMOS-RAM and clear screen.
E-5
BIOS Setup Error Codes
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