![](/images/new-backgrounds/1202359/202359153x1.webp)
Appendix A: BIOS POST Codes
Table A-1. BIOS POST Messages (Continued)
BIOS Message
nnnnkB Extended RAM Passed nnnn Cache SRAM Passed nnnn kB Shadow RAM Passed
nnnn kB System RAM Passed
One or more I2O Block Storage Devices were excluded from the Setup Boot Menu
Operating system not found
Parity Check 1 nnnn
Parity Check 2 nnnn
Press <F1> to resume, <F2> to Setup, <F3> for previous
Press <F2> to enter Setup
PS/2 Mouse:
Run the I2O Configuration Utility
System BIOS shadowed
UMB upper limit segment address: nnnn
Video BIOS shadowed
Description
Where nnnn is the amount of RAM in kilobytes successfully tested.
Where nnnn is the amount of system cache in kilobytes successfully tested.
Where nnnn is the amount of shadow RAM in kilobytes successfully tested.
Where nnnn is the amount of system RAM in kilobytes successfully tested.
There was not enough room in the IPL table to display all installed I2O
Operating system cannot be located on either drive A: or drive
C:.Enter Setup and see if fixed disk and drive A: are properly identified.
Parity error found in the system bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the address, it displays ????. Parity is a method for checking errors in binary data. A parity error indicates that some data has been corrupted.
Parity error found in the I/O bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the address, it displays ????.
Displayed after any recoverable error message. Press <F1> to start the boot process or <F2> to enter Setup and change the settings. Press <F3> to display the previous screen (usually an initialization error of an Option ROM, i.e., an
Write down and follow the information shown on the screen.
Optional message displayed during POST. Can be turned off in Setup.
PS/2 mouse identified.
One or more unclaimed block storage devices have the Configuration Request bit set in the LCT. Run an I2O Configuration Utility (e.g. the SAC utility).
System BIOS copied to shadow RAM.
Displays the address nnnn of the upper limit of Upper Memory Blocks, indicating released segments of the BIOS which can be reclaimed by a virtual memory manager.
Video BIOS successfully copied to shadow RAM.
A-2 BIOS POST Codes
This section lists the POST