Acer Altos R710 manual 186

186		Appendix D: BIOS POST Checkpoint Codes
Checkpoint	Beep Code	Description
Code
09h		Set in-POST flag in CMOS that indicates we
		are in POST. If this bit is not cleared by post-
		ClearBootFlagJ (AEh), the BIOS on next boot
		determines that the current configuration
		caused POST to fail and uses default values
		for configuration.
		Clear the CMOS diagnostic byte (register E).
		Check the real-time clock and verify the bat-
		tery has not lost power. Checksum the
		CMOS and verify it has not been corrupted.
0Ah		Initialize CPU registers.
0Bh		Enable CPU cache. Set bits in CMOS related
		to cache.
0Ch		Set the initial POST values of the cache reg-
		isters if not integrated into the chipset.
0Eh		Set the initial POST values of registers in the
		integrated I/O chip.
0Fh		Enable the local bus IDE as primary or sec-
		ondary depending on other drives detected.
10h		Initialize power management.
11h		General dispatcher for alternate register ini-
		tialization.
		Set initial POST values for other hardware
		devices defined in the register tables.
12h		Restore the contents of the CPU control
		word whenever the CPU is reset.
13h		Early reset of PCI devices required to disable
		bus master. Assumes the presence of a stack
		and running from decompressed shadow
		memory.