Acer G520 series manual Diagnostic LED Decoder Check

165

Diagnostic LED Decoder

Check

point

G=Green, R=Red, A+Amber Description

MSBLSB

3B	G	OFF	R	A	Test for total memory
					installed in the system.
					Also, check for DEL or ESC
					keys to limit memory test.
					Display total memory in
					the system.
3C	G	G	R	R	Mid POST initialization of
					chipset registers.
40	OFF	R	OFF	OFF	Detect different devices
					(Parallel ports, serial ports,
					and coprocessor in
					CPU...etc). successfully
					installed in the system and
					update the BDA,
					EBDA...etc.
50	OFF	R	OFF	R	Programming the memory
					hole or any kind of
					implementation that
					needs an adjustment in
					system RAM size if
					needed.
52	OFF	R	G	R	Updates CMOS memory
					size from memory found
					in memory test. Allocates
					memory for Extended
					BIOS Data Area from base
					memory.
60	OFF	R	R	OFF	Initializes NUM-LOCK
					status and programs the
					KBD typematic rate.
75	OFF	A	R	A	Initialize Int-13 and
					prepare for IPL detection.