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'Spitfire' Motherboard Layout


Front View


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



1 Power button 6 CD headphone jack & volume control
2 CD Eject button 7 Diskette drive
3 CD emergency eject hole 8 Infra-red sensor (optional)
4 CD-ROM disc drawer (platter) 9 Hard disk activity indicator
5 CD activity indicator    

Rear View


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




Casing screws for the top cover


Parallel (printer) port


AC power outlet for monitor


Monitor port


Voltage selection switch


PCI slot (full-length)


AC power inlet from AC supply


ISA slot (full-length)


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    



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


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).

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.


SDRAM memory expansion
16MB 64-bit DIMM Module XB61385
32MB 64-bit DIMM Module XB61386
64MB 64-bit DIMM Module XB61387
128MB 64-bit DIMM Module XB61388
Video memory expansion
1MB to 2MB EDO DRAM upgrade XB57374
Graphics cards for PCI motherboards
Matrox MGA Millenium PCI graphics card add-in with 4MB WRAM XB57212
Hard Drive Options
2.1GB IDE Stratus hard disk drive add-in SU61670
3.2GB IDE Stratus hard disk drive add-in SU61671
IDE HDD fixing kit SU56129
CD-ROM Drives
IDE CDU-511 Sony x16 Speed PCAV CD-ROM Drive XB61060
IDE Sony CD-ROM Drive Fixing Kit for LS500 SU56017
IDE Sony CD-ROM Drive Fixing Kit for LS600 SU60353
SCSI card options
Adaptec 1510B SCSI card add-in (No HDD Support) SA50160
Adaptec 2940 PCI SCSI Card add-in UD55556
SCSI Fixing Kit for AHA1510 SU56213
SCSI Fixing Kit for AHA2940 SU56214
Connectivity options
Intel Pro 100B PCI Ethernet Card XB61343
3Com triple-combo Ethernet card (3C509B) XB55742
3Com 10/100 PCI Ethernet (3C905TX) XB59527
56K ISA Modem XB62192
Diamond ISDN Modem (64K) XB62494
8 port Micro Hub & 3 x 5M UTP cables XB62451
Specialix serial cards
32-port ISA SI/XIO serial card XB54693
4 port terminal adaptor XB43319
8 port terminal adaptor XB43320
8 port modular terminal adapter XB54611
8 port modular terminal adaptor (7 RS232, 1 Parallel) XB54612
Audio Options
Apricot Deepsound Subwoofer XB58090
20W Powered external speakers XB55607
Wavetable upgrade for on-board audio XB57690
UPS (FT600)
APC 420v/s smart ups XB59898

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)

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.

Processor Speed Jumper block PL19
    BF1 BF0 FS PW2 PW1 PW0
Pentium 90 MHz High High In In In In
Pentium 100 MHz High High Out In In In
Pentium 120 MHz High Low In In In In
Pentium 133 MHz High Low Out In In In
Pentium 150 MHz Low Low In In In In
Pentium 166 MHz Low Low Out In In In
Pentium 200 MHz Low High Out In In In
Pentium/MMX 166 MHz Low Low Out Out Out Out
Pentium/MMX 200 MHz Low High Out Out Out Out
Pentium/MMX 233 MHz High High Out Out Out Out

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.


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.

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

Components Interrupts (IRQs)
  0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
System timer                                
Keyboard controller                                
PIC daisy chain                                
Serial port 2       BS                        
Serial port 1         BS                      
Audio           J                    
Diskette controller             BS                  
Parallel port (usually sharable)               BS                
Real time clock                                
On-board video                   J            
USB                     BS          
Primary E-IDE                                
Secondary E-IDE                               BS


Components DMA channels
  0 1 2 3 4 5 6 7
Audio   J            
Diskette controller     BS          
Parallel port (in ECP mode)       BS        
DMAC daisy chain                
BS = Can be disabled by BIOS Setup J = Can be disabled by moving a jumper
Fixed assignment Usual assignment PnP alternative

POST Beep Codes


Beeps Test which failed


1-2-2-3 BIOS ROM checksum


1-3-1-1 DRAM refresh.


1-3-1-3 8742 keyboard controller

2C xxxx

1-3-4-1 RAM failure on address line xxxx.

2E xxxx

1-3-4-3 RAM failure on data bits xxxx of low byte of memory bus.

30 xxxx

1-4-1-1 RAM failure on data bits xxxx of high byte of memory bus.


2-1-2-3 Check ROM copyright notice


2-2-3-1 Test for unexpected interrupts


1-2 Video configuration failure, or option ROM checksum failure. (One long, two short beeps.)


Computing for a Connected World