Technical Reference 73
Table 13. Post Codes (continued)
Diagnostic LED Decoder
G=Green, R=Red, A=Amber
Post
Code MSB LSB
Description
82h R Off G Off Check Stuck Key Enable Keyboard: The keyboard controller
interface test completed. Writing the command byte and initializing
the circular buffer next.
83h R Off G G Disable parity NMI: The command byte was written and global
data initialization has completed. Checking for a locked key next.
84h R G Off Off Verify RAM Size: Checking for a memory size mismatch with
CMOS RAM data next.
84h R G Off Off Check ATA Cable Type presence of ATAPI devices.
84h R G Off Off Display Keyboard Message.
16h Off G G R Display IDE mass storage devices.
17h Off G G A Display USB mass storage devices.
85h R G Off G Report the first set of POST Errors To Error Manager.
86h R G G Off Boot Password Check: The password was checked. Performing
any required programming before Setup next.
8Dh A G Off G OEM Patch 9.
8Dh A G Off G Set Printer RS-232 Timeout.
8Dh A G Off G Init FDD Devices: Resetting the hard disk controller next.
95h R G Off A Lock out PS/2 keyboard/mouse if unattended start is enabled.
92h R Off G R Option ROM Scan.
98h A Off Off R Init Boot Devices: The adapter ROM had control and has now
returned control to BIOS POST. Performing any required
processing after the option ROM returned control.
9Bh A Off G A Float Processor Initialize: Performing any required initialization
before the coprocessor test next.
9Eh A G G R Enable Interrupts 0,1,2: Checking the extended keyboard,
keyboard ID, and NUM Lock key next. Issuing the keyboard ID
command next.
A2h R Off A Off Report second set of POST errors To Error messager.
86h R G G Off Prepare And Run Setup: Error manager displays and logs POST
errors. Waits for user input for certain errors. Execute setup.
8Bh A Off G G Set Base Expansion Memory Size.
8Ch A G Off Off Adjust Setup: Programming the Setup options next.
A5h R G R G Set Display Mode.
A7h R G A G OEM Patch 12.
A7h R G A G Build SMBIOS table and MP tables.
A7h R G A G Program hotkey and timeout settings in keyboard controller.
A7h R G A G Processor initialization before boot.
A7h R G A G Copy required language strings to shadow RAM.
continued