| Code
|
Meaning
|
| 01
|
Processor
register test about to start; disable NMI next.
|
| 02
|
NMI
is Disabled. Power on delay starting. |
| 03
|
Power
on delay complete (to check soft reset/power-on).
|
| 05
|
Soft
reset/power-on determined, going to enable ROM (i.e.
disable shadow RAM cache, if any). |
| 06
|
ROM
is enabled. Calculating ROM BIOS checksum.
|
| 07
|
ROM
BIOS checksum passed. CMOS shutdown register test
to be done next. |
| 08
|
CMOS
shutdown register test done. CMOS checksum calculation
next. |
| 09
|
CMOS
checksum calculation done; CMOS diag byte written;
CMOS initialisation to begin. |
| 0A
|
CMOS
initialization done (if any). CMOS status register
about to init for Date and Time. |
| 0B
|
CMOS
status register init done. Any initialization before
keyboard BAT to be done next. |
| 0C
|
KB
controller I/B free. Going to issue the BAT command
to keyboard controller. |
| 0D
|
BAT
command to keyboard controller is issued. Going to
verify the BAT command. |
| 0E
|
Keyboard
controller BAT result verified. Any initialization
after KB controller BAT next. |
| 0F
|
Initialisation
after KB controller BAT done. Keyboard command byte
to be written next. |
| 10
|
Keyboard
controller command byte is written. Going to issue
Pin-23 & 24 blocking/unblocking command.
|
| 11
|
Keyboard
controller Pin-23 & 24 blocked/unblocked; check
press of <INS> key during power-on .
|
| 12
|
Checking
for pressing of <INS> key during power-on done.
Going to disable DMA/Interrupt controllers.
|
| 13
|
DMA
controller #1 and #2 and Interrupt controller #1 and
#2 disabled; video display disabled and port B initialised;
chipset init/auto memory detection next. |
| 14
|
Chipset
init/auto memory detection over. To uncompress the
POST code if compressed BIOS. |
| 15
|
POST
code is uncompressed. 8254 timer test about to start.
|
| 19
|
8254
timer test over. About to start memory refresh test.
|
| 1A
|
Memory
Refresh line is toggling. Going to check 15 micro
second ON/OFF time. |
| 20
|
Memory
Refresh 30 microsecond test complete. Base 64K memory/address
line test about to start. |
| 21
|
Address
line test passed. Going to do toggle parity.
|
| 22
|
Toggle
parity over. Going for sequential data R/W test on
base 64k memory. |
| 23
|
Base
64k sequential data R/W test passed. Going to set
BIOS stack and do any setup before Interrupt
|
| 24
|
Setup
required before vector initialization complete. Interrupt
vector initialization about to begin. |
| 25
|
Interrupt
vector initialization done. Going to read Input port
of 9042 for turbo switch (if any) and clear password
if POST diag switch is ON next. |
| 26
|
Input
port of 8042 is read. Going to initialize global data
for turbo switch. |
| 27
|
Global
data initialization for turbo switch is over. Any
initialization before setting video mode to be done
next. |
| 28
|
Initialization
before setting video mode is complete. Going for mono
mode and colour mode setting. |
| 2A
|
Monochrome
and colour mode setting is done. About to go for toggle
parity before optional ROM test. |
| 2B
|
Toggle
parity over. About to give control for any setup required
before optional video ROM check next. |
| 2C
|
Processing
before video ROM control is done. About to look for
optional video ROM and give control. |
| 2D
|
Optional
video ROM control is done. About to give control to
do any processing after video RON returns control.
|
| 2E
|
Return
from processing after video ROM control. If EGA/VGA
not found do display memory R/W test. |
| 2F
|
EGA/VGA
not found. Display memory R/W test about to begin.
|
| 30
|
Display
memory R/W test passed. About to look for the retrace
checking. |
| 31
|
Display
mem R/W test or retrace checking failed. About to
do alternate Display memory R/W test. |
| 32
|
Alternate
Display memory R/W test passed. About to look for
the alternate display retrace checking. |
| 34
|
Video
display checking over. Display mode to be set next.
|
| 37
|
Display
mode set. Going to display the power on message.
|
| 39
|
New
cursor position read and saved. Going to display the
Hit <DEL> message. |
| 3B
|
Hit
<DEL> message displayed. Virtual mode memory
test about to start. |
| 40
|
Going
to prepare the descriptor tables. |
| 42
|
Descriptor
tables prepared. Going to enter in virtual mode for
memory test. |
| 43
|
Entered
in virtual mode. Going to enable interrupts for diagnostics
mode. |
| 44
|
Interrupts
enabled (if diags switch is on). Going to initialize
data to check memory wrap around at 0:0. |
| 45
|
Data
initialized. Going to check for memory wrap around
at 0:0 and find total system memory size. |
| 46
|
Memory
wrap around test done. Memory size calculation over.
About to go for writing patterns to test memory.
|
| 47
|
Pattern
to be tested written in extended memory. Going to
write patterns in base 640k memory. |
| 48
|
Patterns
written in base memory. Going to find amount of memory
below 1Mb. |
| 49
|
Amount
of memory below 1Mb found and verified. Going to find
out amount of memory above 1Mb memory. |
| 4B
|
Amount
of memory above 1Mb found and verified. Check for
soft reset and going to clear memory below 1Mb for
soft reset next (if power on go to POST # 4Eh).
|
| 4C
|
Memory
below 1Mb cleared.(SOFT RESET) |
| 4D
|
Memory
above 1Mb cleared.(SOFT RESET); save memory size next
(go to POST # 52h). |
| 4E
|
Memory
test started. (NOT SOFT RESET); display first 64K
memory size next. |
| 4F
|
Memory
size display started. This will be updated during
memory test; sequential and random memory test next.
|
| 50
|
Memory
testing/initialisation below 1Mb complete. Going to
adjust displayed memory size for relocation/ shadow.
|
| 51
|
Memory
size display adjusted due to relocation/ shadow. Memory
test above 1Mb to follow. |
| 52
|
Memory
testing/initialisation above 1Mb complete. Going to
save memory size information. |
| 53
|
Memory
size information is saved. CPU registers are saved.
Going to enter real mode. |
| 54
|
Shutdown
successful, CPU in real mode, disable gate A20 line
next. |
| 57
|
A20
address line disable successful. Going to adjust memory
size depending on relocation/shadow. |
| 58
|
Memory
size adjusted for relocation/shadow. Going to clear
Hit <DEL> message. |
| 59
|
Hit
<DEL> message cleared. <WAIT...> message
displayed. About to start DMA and interrupt controller
test. |
| 60
|
DMA
page register test passed. About to go for DMA #1
base register test. |
| 62
|
DMA
#1 base register test passed. About to go for DMA
#2 base register test. |
| 65
|
DMA
#2 base register test passed. About to program DMA
unit 1 and 2. |
| 66
|
DMA
unit 1 and 2 programming over. About to initialize
8259 interrupt controller. |
| 67
|
8259
initialization over. About to start keyboard test.
|
| F4
|
Extended
NMI sources enabling is in progress (EISA).
|
| 80
|
Keyboard
test started. Clear output buffer; check for stuck
key; issue reset keyboard command next. |
| 81
|
Keyboard
reset error/stuck key found. About to issue keyboard
controller interface test command. |
| 82
|
Keyboard
controller interface test over. About to write command
byte and init circular buffer. |
| 83
|
Command
byte written; global data init done; check for lock-key
next. |
| 84
|
Lock-key
checking over. About to check for memory size mismatch
with CMOS. |
| 85
|
Memory
size check done. About to display soft error and check
for password or bypass setup. |
| 86
|
Password
checked. About to do programming before setup.
|
| 87
|
Programming
before setup complete. Uncompress SETUP code and execute
CMOS setup. |
| 88
|
Returned
from CMOS setup and screen is cleared. About to do
programming after setup. |
| 89
|
Programming
after setup complete. Going to display power on screen
message. |
| 8B
|
First
screen msg displayed. <WAIT...> message displayed.
About to do Main/Video BIOS shadow. |
| 8C
|
Main
and Video BIOS shadow successful. Setup options programming
after CMOS setup about to start. |
| 8D
|
Setup
options are programmed; mouse check and init next.
|
| 8E
|
Mouse
check and initialisation complete. Going for hard
disk controller reset. |
| 8F
|
Hard
disk controller reset done. Floppy setup to be done
next. |
| 91
|
Floppy
setup complete. Hard disk setup to be done next.
|
| 94
|
Hard
disk setup complete. Going to set base and extended
memory size. |
| 96
|
Memory
size adjusted due to mouse support, hard disk type
47; any init before C800, optional ROM control next.
|
| 97
|
Init
before C800 optional ROM control is over. Optional
ROM check and control next. |
| 98
|
Optional
ROM control done. About to give control for any required
processing after optional ROM returns control next.
|
| 99
|
Any
initialization required after optional ROM test over.
Going to setup timer data area and printer base address.
|
| 9A
|
Return
after setting timer and printer base address. Going
to set the RS-232 base address. |
| 9B
|
Returned
after RS-232 base address. Going to do any initialization
before coprocessor test. |
| 9C
|
Required
initialization before co-processor is over. Going
to initialize the coprocessor next. |
| 9D
|
Coprocessor
initialized. Going to do any initialization after
coprocessor test. |
| 9E
|
Init
after coprocessor test complete. Going to check extd
keyboard; keyboard ID and NumLock. |
| 9F
|
Extd
keyboard check is done; ID flag set; NumLock on/off,
issue keyboard ID command next. |
| A0
|
Keyboard
ID command issued. Keyboard ID flag to be reset.
|
| A1
|
Keyboard
ID flag reset. Cache memory test to follow.
|
| A2
|
Cache
memory test over. Going to display any soft errors.
|
| A3
|
Soft
error display complete. Going to set the keyboard
typematic rate. |
| A4
|
Keyboard
typematic rate set. Going to program memory wait states.
|
| A5
|
Memory
wait states programming over. Going to clear the screen
and enable parity/NMI. |
| A7
|
NMI
and parity enabled. Going to do any initialization
required before giving control to optional ROM at
E000 next. |
| A8
|
Initialization
before E000 ROM control over. E000 ROM to get control
next. |
| A9
|
Returned
from E000 ROM control. Going to do init required.
|
| AA
|
Init
after E000 optional ROM control is over. Going to
display the system configuration. |
| B0
|
System
configuration is displayed. Going to uncompress SETUP
code for hot-key setup. |
| B1
|
Uncompressing
of SETUP code is complete. Going to copy any code
to specific area. |
| 00
|
Copying
of code to specific area done. Going to give control
to INT 19h boot loader. |
