Acer Altos R710 manual BIOS POST Checkpoint Codes

185

BIOS POST Checkpoint Codes

The following table describes the checkpoints and associated beep codes, if any, that may occur during the POST portion of the BIOS.

Checkpoint	Beep Code	Description
Code
01h	One short
	beep before
	boot
02h		Verify Real Mode. If the CPU is in protected
		mode, turn on A20 and pulse the reset line,
		forcing a shutdown 0.
		NOTE: Hook routine should not alter DX,
		which holds the powerup CPUID.
03h		Disabel Non-Maskable Interrupts (NMI).
04h		Get CPU type from CPU registers and other
		methods.
		Save CPU type in NVRAM.
		NOTE: Hook routine should not alter DX,
		which holds the powerup CPUID.
06h		Initialize system hardware. Reset the DMA
		controllers, disable video, clear any pending
		interrupts from the real-time clock and
		setup port B register.
07h		Disable system ROM shadow and start to
		execute ROMEXEC code from the flash part.
		This task is pulled into the build only when
		the ROMEXEC relocation is installed.
08h		Initialize chipset registers to the Initial POST
		Values.