IBM S09N-8590-00 manual Ports Checkout, Power Management Features

I/O	Ports	Checkout
Note:	Be sure to enable the		serial and	parallel	ports in
	the BIOS setup utility before performing diagnostics
	tests on the I/O ports.
	Also, be sure to write		down the I/O address for			the
	serial	port to identify	the port	in the	diagnostic	test.

Do perform a diagnostics checkout on the I/O ports:

1.Boot from the diagnostics diskette and start the program.

2. Go	toDiagnostics		on	the	main	menu and	select
Serial	Ports	orParallel Ports .
Note:	If	you	want	to	do	a check	on the infrared port,
	selectSerial		Ports .

3.In the Serial Port Test Category, you can check four items:

ŸRegisters and Interrupts

ŸInternal Loopback

ŸExternal Loopback

ŸFIFO Buffers (16550A)

Move the cursor to the item you want to check, and press Enter. Then follow the instructions on the screen.

Note: To do an External Loopback test, you must have a Loopback plug.

4.In the Parallel Port Test Category, you can check two items:

Ÿ Command And Data Port

ŸExternal Loopback And IRQ

Move the cursor to the item you want to check, and press Enter. Then follow the instructions on the screen.

Note: To	do an	External	Loopback	And IRQ test,
you	must	have a	Loopback	plug.

Power Management Features

Three power management modes are available in the com- puter system to reduce power consumption and to prolong battery life.

Standby Mode: In standby mode, the following occurs:

Ÿ The LCD backlight turns off.

ŸThe hard disk drive motor stops.

Events that cause the computer to enter standby mode:

ŸStandby mode requested by the Fn key (Fn+F3).

ThinkPad 24013