| 01 |
Test 80286 CPU flags and registers |
| 02 |
Test BIOS ROM checksum |
| 03 |
Test MC 146818 CMOS RAM battery - real time clock |
| 04 |
Test 8254 programmable interrupt controller |
| 05 |
8254 programmable interrupt controller test failed |
| 06 |
Initialize RAM refresh |
| 07 |
Test first 16K RAM |
| 08 |
Initialize cold boot interrupt vectors |
| 09 |
Test 8259 programmable interrupt controller and interrupt
vectors |
| 0A |
Fill in temporary interrupt vectors |
| 0B |
Initialize interrupt vector table 1 |
| 0C |
Initialize interrupt vector table 2 |
| 0D |
Initialize fixed disk vector |
| 0E |
Interrupt vector test failed |
| 0F |
Clear keyboard controller input buffer |
| 10 |
Keyboard controller input buffer clearing failed |
| 11 |
Run keyboard controller self test |
| 12 |
Initialize equipment check data area |
| 13 |
Determine presence of and install 80287 math coprocessor |
| 14 |
Test MC 146818 CMOS RAM disk value range |
| 15 |
Test for and install parallel port |
| 16 |
Test for and install serial port |
| 17 |
Call interrupt 19 boot loader |
| 01 |
Cold boot started |
| 06 |
Initialize chipset if any |
| 07 |
Warm boot entry; Start of 8042 keyboard controller self test |
| 08 |
Part of cold boot keyboard initialization passed |
| 09 |
Keyboard self test passed; Test CMOS checksum |
| 0A |
Test CMOS RAM battery |
| 0B |
Save CMOS RAM battery condition in CMOS diagnostic/status
register |
| 0C |
Finished saving CMOS RAM battery condition |
| 0D |
Test 8254 programmable interrupt timer; Disable RAM parity,
I/O parity, DMA controllers and system speaker; Enable timer channel 2 |
| 0E |
8254 programmable interrupt timer test failed, xx is the failing
channel number |
| 0F |
Initialize 8254 programmable interrupt timer channels; Conduct
memory refresh test |
| 10 |
Refresh test failed |
| 11 |
Test base 64K RAM and fill with zeros |
| 12 |
64K RAM test failed - 3 long beeps and system halt |
| 13 |
64K RAM test passed |
| 14 |
Set up stack; Disable mappers for systems that support EMS
drivers; Initialize battery beep flag parameters for notebook; Perform read/write
test of CMOS RAM; Enable error message if failed |
| 15 |
CMOS RAM read/write test complete |
| 16 |
Calculating CPU speed; May set to low if CMOS RAM failed |
| 18 |
Test and initialize both 8259 programmable interrupt controllers |
| 1A |
8259 programmable interrupt controllers initialization complete |
| 1B |
Install interrupt handler and vector for interrupt 0F to check
for unexpected interrupts; Halt is unexpected interrupt occurs |
| 1C |
Unexpected interrupt did not occur; Test 8254 programmable
interrupt timer channel 0, IRQ 0 and software interrupt 8 tests |
| 1D |
Error; Timer 0 interrupt did not occur when expected, system
is halted |
| 1E |
Both 8259 programmable interrupt controllers passed the tests |
| 20 |
Set up interrupt vectors 02-1F |
| 21 |
Set up interrupt vectors 70-77 |
| 22 |
Clear interrupt vectors for 41 and 46 |
| 23 |
Read 8042 keyboard controller self test result; DMA page register
channel 2 |
| 24 |
Test for proper 8042 keyboard controller self test result |
| 25 |
Error; Keyboard controller self test failed; System id halted
with message displayed |
| 26 |
Keyboard controller self test passed |
| 27 |
Confirm DMA working; Prepare DMA channel 2 for floppy data
transfer |
| 28 |
Reinitialize video |
| 29 |
Reinitialize video with cursor off |
| 2A |
Video parameters are initialized |
| 2B |
Enable NMI and I/O channel check; Disable 8254 programmable
interrupt timer channel 2 and speaker |
| 2C |
Run RAM test to determine size of RAM |
| 2D |
RAM sizing complete |
| 2E |
Send reset command to keyboard controller to initialize a
keyboard scan cycle |
| 2F |
Keyboard has been initialized; Initialize CMOS real time clock |
| 30 |
CMOS real time clock has been initialized; Initialize on board
floppy if any |
| 31 |
Install the hard disk controller |
| 32 |
Disk controller has been initialized; Prepare DMA channel
2 for floppy transfers |
| 33 |
Perform equipment check and initialize math coprocessor |
| 34 |
Install the serial and parallel ports |
| 35 |
Test CMOS RAM battery |
| 36 |
Check for keystroke |
| 37 |
Enable 8254 programmable interrupt timer channel 0 for system
tick; Enable keyboard and slave interrupt controller 8259 programmable interrupt
controller 2 |
| 38 |
Timer tick, keyboard and 8259 programmable interrupt controller
2 have been initialized; Enable/disable cache through CMOS RAM |
| 39 |
Enable keyboard interface and interrupts; Go to built in setup
program as necessary; Shadow ROM's found |
| 3A |
Set up complete |
| 3B |
Test the hard disk and floppy disk |
| 3C |
Scan for and invoke the adapter ROM's in C800-E000 |
| 3D |
Turn of gate A20; Restore vectors 3bh-3fh with temporary interrupt
service routines |
| 3E |
Gate A20 turned on |
| 3F |
Call interrupt 19 boot loader |
| 01 |
Disable cache, enable ROM, high speed on, turn off cache's,
disable EISA NMI's, set master/slave IRQ's to edge triggered, disable reset
chaining; Disable 82C601 chip |
| 05 |
Initialize address decoder, 640K RAM; Set BIOS as cacheable,
enable extended memory |
| 06 |
Clear shutdown flag |
| 07 |
8042 keyboard controller test; Wait till 8042 buffer empty;
Disable 8042 command, read 8042 output buffer; Set response ok to DMA page
register channel 2 |
| 08 |
Send 8042 keyboard controller NOP command; Get 8042 self test
result; Send DMA page register channel 2; If xx=55, then self test ok |
| 09 |
Test BIOS ROM checksum |
| 0A |
Read CMOS registers 3 times to clear pending CMOS real time
clock interrupts; Disable real time clock interrupts; Check battery |
| 0B |
Bad CMOS RAM battery |
| 0C |
Send command to port 61 to disable parity and speaker |
| 0D |
Test 8254programmable interrupt timer counter |
| 0E |
One of the counter timers is bad; xx indicates the bad counter |
| 0F |
Enable and check memory refresh |
| 10 |
Memory refresh failed |
| 11 |
Check and clear the first 64K RAM in real mode; Disable NMI;
Clear parity latches; Fill 64K with 5555 and check it, then AAA and check
it, then 0000 |
| 12 |
First 64K RAM memory test failed |
| 13 |
First 64K RAM memory test passed |
| 14 |
Reset the warm boot flag and test CMOS RAM; Turn off caches;
Shadow the BIOS; set high speed; Calculate high speed and initialize GP
flag; Set low speed and turn off cache if CMOS not good or CMOS speed not
high |
| 16 |
Check shutdown flag 123x |
| 17 |
Reset was cold boot |
| 18 |
Prepare 8259 programmable interrupt controllers |
| 19 |
8259 programmable interrupt controllers initialization failed;
Initialize video and display the error message |
| 1A |
Test 8259 programmable interrupt controller |
| 1B |
Set interrupt 0F to unexpected interrupt vector; Enable timer
and interrupt |
| 1C |
Set interrupt 08 to timer 0 interrupt vector |
| 1D |
Timer interrupt did not occur; Initialize video and display
error message |
| 1E |
Initialize interrupt vectors |
| 1F |
Initialize interrupt vectors 00-6F to temporary interrupt
service routines |
| 20 |
Set vectors for interrupt 02-1F |
| 21 |
Set interrupt vectors for 70-77, clear vectors 60-67 and 78-FF |
| 22 |
Clear interrupt vectors for 41 and 46 |
| 23 |
Read 8042 keyboard controller self test results from DMA page
register channel 2 |
| 24 |
Test for proper 8042 keyboard controller self test result |
| 25 |
8042 keyboard controller self test failed |
| 26 |
Initialize 8042 keyboard controller |
| 27 |
Check shutdown flag=123x; If no=cold boot |
| 28 |
If cold boot or CMOS RAM is bad, then install video ROM and
initialize video; Initialize equipment flags according to primary video
adapter and CMOS RAM content; Initialize POST status |
| 29 |
If not cold boot and CMOS RAM ok; Install video ROM and initialize
video for mono/CGA; Initialize equipment flags according to primary video
adapter and CMOS RAM contents |
| 2A |
Check for bad CMOS RAM |
| 2B |
Check shutdown flag=123x |
| 2C |
If cold boot; Turn off caches; Test memory for size and reinitialize
cache status |
| 2D |
Turn off "POST fail" CMOS RAM bit and display and
error messages; Initialize keyboard RAM |
| 2E |
Initialize 8042 keyboard controller and test keyboard |
| 2F |
Initialize time of day in real time clock |
| 30 |
Test for and install floppy drive controller |
| 31 |
Enable 82C601 IDE interface; Test for and install hard disk |
| 32 |
Test 8259 programmable interrupt controller DMA registers
with 55 then AA, then initialize them to 00 |
| 33 |
Test for and initialize math coprocessor |
| 34 |
Test for and initialize parallel and serial ports |
| 35 |
Initialize RAM variables for bad CMOS time, date, checksum
and battery |
| 36 |
Wait for user to press Esc or Space; Check for keyboard lock;
Clear keyboard lock override; Beep to indicate speed; Display error messages |
| 37 |
Enable system clock tick (IRQ 0); Enable keyboard (IRQ 1);
Enable slave interrupt controller (IRQ 2) |
| 38 |
Initialize RAM variables for Ctrl-Alt_Esc |
| 39 |
Enter setup is keystroke pressed |
| 3A |
Clear screen and update equipment flags according to CMOS
RAM contents; Shadow ROM's; Enable/disable cache through CMOS RAM |
| 3B |
Initialize floppy and hard drives |
| 3C |
Set POST failed bit in CMOS RAM; Scan for and initialize adapter
ROM's |
| 3D |
Clear the shutdown flag to 0; Disable gate A20 and enable
memory wrap in real mode |
| 3E |
Set vectors for interrupts 3B-3F; Clear post fail bit in CMOS
RAM |
| 3F |
Call interrupt 19 boot loader |