'Spitfire' Motherboard Layout

Front View

Mini-tower

1	Infra-red sensor (optional)	7	CD activity indicator
2	Hard disk activity indicator	8	Lockable front door
3	Power Mode indicator	9	CD emergency eject hole
4	Power button	10	CD Eject button
5	CD-ROM disc drawer (platter)	11	Diskette drive
6	CD headphone jack & volume control	12	Front lifting point

Desktop

Rear View

Mini-tower

1	Monitor port	9	Serial port 2 (optional)
2	Parallel (printer) port	10	Handles to assist side panel removal
3	Dual USB port	11	Security loop for cable or padlock
4	Serial (modem) port 1	12	AC power outlet for monitor
5	Mouse port	13	Voltage selection switch
6	Keyboard port	14	AC power inlet from AC supply
7	Audio output socket	15	Caselock
8	Audio input socket	A	Side panel fixing screws

Desktop

1	Casing screws for the top cover	11	Parallel (printer) port
2	AC power outlet for monitor	12	Monitor port
3	Voltage selection switch	13	PCI slot (full-length)
4	AC power inlet from AC supply	14	ISA slot (full-length)
5	Audio input socket	15	ISA slot (half-length, half-height)
6	Audio output socket	16	PCI slots (two half-length)
7	Keyboard port	17	Serial port 2 (optional)
8	Mouse port	18	Security loop for cable or padlock
9	Serial (modem) port 1	19	Caselock
10	Dual USB port

Motherboard

1	Video memory sockets	11	Secondary E-IDE connector
2	Motherboard power connector	12	Primary E-IDE connector
3	VESA/AMC feature connector	13	CMOS battery
4	PSU logic connector	14	"Wake on LAN" connector
5	DIMM sockets	15	1.44MB diskette drive connector
6	Processor fan-sink connector	16	Second serial port connector
7	Processor ZIF socket	17	Modem audio connector
8	Riser board connector	18	CD audio connector
9	Internal speaker connector
10	Front panel connector Pins 1-2 POWER button Pins 3-4 HDD indicator light Pins 5-6 Unused Pins 7-8 Power Mode light

Memory

You can give your PC more memory by adding or replacing memory modules called "DIMMs". The motherboard’s two DIMM sockets accept DIMMs of up to 128 Mbytes in any combination (giving a maximum memory capacity of 256 Mbytes).

Important
The DIMMs you use must have the following specification: SPD, gold contacts, 3.3V, 64-bit, unbuffered, either SDRAM-type with a CAS latency of 2 at 66 MHz or else EDO-type with 60 ns timing. If you use any other type of DIMM you risk damaging the motherboard.

Add-Ins

Jumper Settings

There are only a few jumpers on the motherboard that you may need to alter. All others are set at the factory and should not be changed.

On the motherboard, pin 1 of each jumper block is indicated by a small triangular marking.

Processor voltage and bus speed (PL19, PL18)

Caution
Do not change these jumpers unless you have upgraded the processor. If they are set incorrectly the processor and other vital motherboard components could be destroyed.

The BF0 and BF1 jumpers on jumper block PL19 may be fitted in the High ("1") or Low ("0") position; the FS, PW2, PW1 and PW0 jumpers may simply be either fitted across both pins ("In") or not ("Out").

For Pentium processors only, two jumpers must also be fitted on PL18. These jumpers must not be fitted for Pentium/MMX processors.

On-board video disabling (PL19)

If you install a video adapter expansion card, the computer should automatically detect this and disable the on-board video adapter. If for some reason this does not happen, and you experience problems with a newly-fitted card, you can manually disable the on-board video adapter by removing the VGA jumper from jumper block PL19.

Audio disabling (PL19)

The on-board audio system can be disabled by removing the AUD jumper from jumper block PL19. Disabling the audio system frees the interrupt and DMA channel used by that system (normally IRQ5 and DMA1).

BIOS upgrade and recovery (PL11, PL4, PL3)

These jumpers should not normally be changed except by a service engineer or at the direction of a service engineer.

CMOS is cleared by moving the PL11 jumper to the 2-3 position for a few moments while the system is turned off, then returning it to the normal 1-2 position.

If an error occurs during reprogramming of the BIOS to the extent that the BIOS becomes corrupt, the PL4 jumper can be moved to the 2-3 (RCVR) position to switch to a recovery BIOS. A recovery system diskette will be required when the system is restarted.

You must ensure that BIOS reprogramming is enabled if you want to use the optional Apricot LS Security Card (LOC Technology).

Clearing CMOS PL11
CMOS battery connected (default)1-2
CMOS battery disconnected 2-3

BIOS image selection PL4
Boot using normal BIOS (default) 1-2 (NORM)
Boot using recovery BIOS 2-3 (RCVR)

BIOS reprogramming PL3
Enabled (default) 1-2 (PROG)
Disabled 2-3 (DIS)

Power Mode light colour (PL201)

Normally, the Power Mode light is [red] when the system is in Off mode. If you move the jumper on block PL201 to pins 2-3 (OFF) the light is extinguished in Off mode.

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. This battery has a life of up to 5 years. If you find that you have to reconfigure the computer every time you turn it on, the battery is probably failing and needs to be replaced.

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 system unit cover. For more information see the section on "Anti-static precautions" in the Safety & Regulatory Notices at the start of this manual.
3. Remove any expansion cards that impede access to the battery holder.
4. Using a non-conductive implement, release the latch that holds the battery in place. The battery will pop up allowing you to lift it out of the holder.

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.

5. Check that the replacement battery looks the same as the battery you have removed.
6. Taking care not to touch the top or bottom surface of the battery, pick up the replacement with the positive (+) terminal upwards. Press the battery into the holder using a non-conductive implement.
7. Replace any expansion cards you removed earlier and refit the system unit cover.
8. 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.

Setup Screens

System Resources

POST Beep Codes