LS100 Motherboard Layout

Front View

	A	Power-on (green LED) / Sleep mode (yellow LED) Modem message waiting (flashing)
	B	Hard drive activity (green LED)
	C	LAN activity (green LED)
	D	Push-button power switch

Rear View

	A	LAN
	B	Audio Line In
	C	Audio Line Out
	D	USB ports
	E	Mouse or keyboard
	F	Mouse or keyboard
	G	Serial port B
	H	Serial port A
	I	Parallel port
	J	Video/VGA port
	K	PCI expansion slot
	L	AC power in

Motherboard

A	Back panel I/O connectors	L	Chassis security connector
B	Battery	M	Speaker
C	Yamaha OPL3-SA3 audio codec	N	Socket 7 Pentium processor socket
D	Bus freq / BIOS / recovery jumper	O	Clock multiplier jumper
E	National 87307 I/O controller	P	Voltage regulator jumper
F	430TX PCI ISA/IDE Xcelerator (PIIX4)	Q	Voltage regulator
G	NLX Riser connector	R	DIMM sockets
H	2Mbit Flash BIOS	S	430TX System Controller (MTXC)
I	L2 PBSRAM cache	T	S3 VIRGE/GX graphics controller
J	Hardware monitor ASIC	U	SGRAM video memory
K	Fan connector

Back panel connectors

NLX Riser card

Memory

The motherboard has two Dual Inline Memory Module (DIMM) sockets. Memory can be installed in one or two sockets. The BIOS automatically detects memory type, size and speed, so no jumper settings are required.

The motherboard supports the following:

• 168-pin 3.3V DIMMs with gold-plated contacts
• 60nS CAS Latency 2 unbuffered 4-clock 3.3V SDRAM
• Caching for the first 64MB of main memory
• 64-bit data path
• Single- or double-sided DIMMS in the folowing sizes:

DIMM size	Type	Configuration	Product Code
16MB	SDRAM	2M x 64	XB61385
32MB	SDRAM	4M x 64	XB61386
64MB	SDRAM	8M x 64	XB61387

 

Disks

Jumper Settings

* This jumper also sets the PCI and ISA bus frequencies

Normal Mode

This mode is for normal computer booting and operations. Connect pins 1 and 2 with a jumper on the configuration jumper block (J6J1) to enable the mode. The BIOS uses the current bus/processor frequency ratio, configuration information, and passwords to boot the computer. Access to the Setup program can be restricted using an administrative or user password.

In normal mode, the BIOS attempts an automatic recovery if the configuration information in flash memory is corrupted.

Configure Mode

This mode is for clearing passwords. Connect pins 2 and 3 with a jumper on the configuration jumper block (J6J1) to enable the mode. In this mode, Setup automatically executes after the POST runs, and no password is required. Setup provides the Maintenance menu with the option for clearing passwords. All other Setup screens are available. Configure mode uses the default BIOS settings for booting, not the current user or administrative settings. When the computer is rebooted, Setup uses the original user and administrative settings with the exception of the options that were changed. For the configuration changes to take effect after exiting the Setup program, power down the computer, set the configuration jumper to normal mode and boot the computer.

 Recovery Mode

This mode is for upgrading the BIOS or recovering BIOS data. Remove the jumper (no pins connected) from the configuration jumper block (J6J1), Pins 1-3 to enable this mode. After the computer is powered-on, the BIOS attempts to upgrade or recover the BIOS data from a diskette in the floppy drive. Beep codes indicate the recovery status: one beep indicates the start of the recovery, two beeps indicate a successful recovery, and multiple beeps indicate a failed recovery. If a diskette is not in the boot drive, the BIOS attempts to run the POST, does not boot the operating system, and displays a message that the jumper is not properly installed.

For the changes to take effect after a successful recovery, power down the computer, set the jumper to normal mode and boot the computer.

Processor Configuration (J4A1)

The motherboard must be configured for the frequency of the host bus and the frequency of the installed processor. The table below shows the jumper settings for each processor frequency and the corresponding host bus, PCI bus, and ISA bus frequencies.

Processor (MHz)	Jumper J4A1	Host Bus (MHz)	PCI Bus (MHz)	ISA Bus (MHz)	Clock Multiplier
233	1-2 and 4-5	66	33	8.33	3.5
200	1-2 and 5-6	66	33	8.33	3.0
166	2-3 and 5-6	66	33	8.33	2.5
150	2-3 and 5-6	60	30	7.5	2.5
133	2-3 and 4-5	66	33	8.33	2.0
120	2-3 and 4-5	60	30	7.5	2.0
100	1-2 and 4-5	66	33	8.33	1.5
90	1-2 and 4-5	60	30	7.5	1.5

Note: There are no additional jumpering requirements for Pentium processors with MMX technology.

The 100 MHz Pentium processor and the 233 MHz Pentium processor with MMX technology have identical jumper settings. The motherboard automatically detects which processor type is installed

CMOS

Replacing the configuration battery

The computer keeps a record of its current hardware configuration in a CMOS memory chip which is sustained by a small battery. The battery is a 3 volt lithium type (CR2032 or equivalent) typically used in calculators and other small, battery-powered electronic items.

To replace the battery

1. Turn off the computer and unplug all power cords.
2. Take suitable anti-static precautions and remove the top cover and top chassis.
3. Remove the battery with the use of a non-conductive tool.

Warning
You must not use a metal or other conductive implement to remove the battery. If a short-circuit is accidentally made between the battery’s positive and negative terminals, the battery may explode.

4. Replace the battery with type CR2032 or equivalent (observe correct polarity).
5. Replace top chassis.
6. Replace top cover.
7. Dispose of the discharged battery in accordance with the battery manufacturer’s instructions.

The next time you turn on the computer you will have to run the BIOS Setup utility to reset the hardware configuration.

 

System Resources

Memory Map

DMA Channels

I/O Map

PCI Configuration Space Map

Interrupts

 

Memory Map

DMA Channels

I/O Map

*   Gameport is not implemented on this motherboard
**  DWORD access only
*** Byte access only

PCI Configuration Space Map

Interrupts

* Default, but can be changed to another IRQ

Note: PCI devices, including USB, will be assigned interrupts dynamically.

POST Beep Codes