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Apricot Lightning Motherboard

Front View


Mini Tower Case - Front View
1. Infra-red sensor10. Universal Serial Bus (USB) port
2. Hard disk activity indicator11. FireWire port (factory option)
3. Power Mode light12. S-Video In port (factory option)
4. Power button13. Composite Video In port (factory option)
5. CD-ROM disc drawer (platter)14. CD emergency eject hole
6. CD headphone jack & volume control     15. CD Eject button
7. CD activity indicator16. Diskette drive
8. Line In socket for audio input17. Message LED alerts you that you have an unread message
9. Headphones socket18. Message Cancel button clears the Message LED alert


Desktop Case - Front View
1. Power button6. CD phono jack & volume control
2. CD Eject button7. Diskette drive
3. CD emergency eject hole8. Infra-red sensor (optional)
4. CD-ROM disc drawer (platter)9. Hard disk activity indicator
5. CD activity indicator  

Rear View


Mini Tower Case - Rear View
1. Monitor port12AC power outlet for monitor
2. S-Video Out Port (factory option)13Voltage selection switch
3. Parallel (printer) port14. AC power inlet from AC supply
4. Mouse port15. Caselock
5. Keyboard port16. MIDI/Joystick port
6. Serial port17. Auxiliary Line In socket (factory option)
7. Microphone socket18. SPDIF digital audio output (factory option)
8. Line Out socket for audio output19. Modem port
9. Speaker socket  
10. Universal Serial Bus (USB) portA. Side panel fixing screws
11. Security loop for cable or padlock        B. Handles to assist side panel removal


Desktop Case - Rear View 
1. Casing screws for the top cover12. Parallel (printer) port
2. AC power outlet for monitor13. Video out port (option)
3. Voltage selection switch14. Monoitor port
4. AC power inlet from AC supply15. PCI slot (full-length)
5. Double USB port16. ISA slot (full-length)
6. Audio output (speaker) jack17. ISA slot (half-length)
7. Audio line-out jack18. PCI slots (two half-length)
8. Microphone input jack19. Serial port 2 (optional)
9. Serial (modem) port 120. Security loop for cable or padlock
10. PS/2 Keyboard port21. Caselock (key supplied)
11. PS/2 Mouse port  


Lightning Motherboard Diagram
1Auxiliary Line In internal connector (option)         12Front panel conn. option
21.44MB diskette drive connector13   Processor slot
3S/P Dif. (option) dig. audio14DIMM sockets
4CD audio connector15Case fan connector
5Front panel USB internal connector (option)16CPU fan connector
6Primary E-IDE connector17Processor heat sense input
7Secondary E-IDE connector18VEC/AMC feature connector
8PSU logic connector19TV tuner connector (option)
9‘Wake on LAN’ connector20Video memory upgrade socket
10"Wake on Call" Modem connector21Riser board connect
11CMOS battery22Motherboard power connector
  23COM2 interface (option)
J1On-board video enable/disableAMonitor port
J2BIOS program enable/disableBTV Out (S-Video) port (factory option)
J5-8Processor clock multipliersCParallel (printer) port
J9DSP enable/disable (option)DPS/2 Mouse port
J10Audio subsystem enable/disableEPS/2 Keyboard port
J11Red power LED enable/disableFSerial port COM1
J12Clear CMOSGMicrophone socket
PL4Server management (option)HLine Out socket
PL18     Joystick/MIDI internal connector ISpeaker socket
PL19Voice modem audio connectorJDual USB port
PL23Front panel controls/options  
PL25Internal case speaker (if fitted)  
PL26Message light (option)  
PL27Message switch (option)  

Note : Lightning incorporates Intel 440LX chipset (66MHz system bus)
Lightning BX incorporates Intel 440BX chipset (66 or 100MHz system bus)


The motherboard’s three DIMM sockets accept DIMMs of up to 128 Mbytes in any combination (giving a maximum memory capacity of 384 Mbytes). The slot 'MM1'nearest to the processor  is recommended to be used first.

Note that the Lightning and Lightning BX motherboards use DIMMs of different specifications. See below for details and ensure that you fit the correct type.

Lightning - The DIMMs you use must have the following specification: gold contacts, 3.3V, 64 or 72-bit, unbuffered, SDRAM-type with Serial Presence Detect (SPD) and a CAS latency of 2 at 66 MHz. If you use any other type of DIMM you risk damaging the motherboard.

Lightning BX - The DIMMs you use must meet the following specification: Serial Presence Detect (SPD), gold contact, 64-bit, (or 72-bit ECC), unbuffered, 3.3V, SDRAM type, Intel PC100 spec compliant.

The ECC capabilities of 72-bit DIMMs will only operate if all the DIMMs in the system are 72-bit.

Using DIMMs of a different type could affect system performance with arisk of damaging the motherboard.

MS600 (MV) Processor Upgrades Page

This is the processor upgrade page for MS600 with the model number prefix MV.

To use the tables below, select the processor you wish to upgrade to and confirm that the upgrade is possible. Then check additional requirements such as BIOS upgrades & processor speed jumper settings.

MS600 (MV) Processor upgrades
Processor type and speed     Is it supported?
Pentium II 233MhzYES
Pentium II 266MhzYES
Pentium II 300MhzYES

Listed below are the Processor Speed Jumpers for an MS Series computer with a model number prefix of MV.

Processor Speed Jumper Table (I=jumper fitted, O=No jumper)
J5J6J7J8CPU Speed

BIOS Upgrade

For MV (MS600) model machines, there is no updated BIOS currently available.


Cannot be Upgraded

Video RAM

Cannot be Upgraded

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.

Warning - Do not change jumper settings unnecessarily as you may damage the system processor, the motherboard, or both.

On-board video disabling (J1)

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 moving jumper J1 from position 2-3 (EN) to position 1-2 (DIS).

Processor multiplier (J5 to J8)

The details below are given for the clock speeds of processors known at the time of writing. Higher speed and overdrive processors may become available, in which case consult your supplier for further information.

In the case of the Lightning BX, the processor will send information to the BIOS and the BX chipset, ensuring that the required bus frequency is set automatically.

You then have to set the links as below.

 CPU bus speed
J5J6J7J8Ratio66MHz bus100MHz bus *

I = jumper fitted, O = No jumper

* Lightning BX only

Audio DSP (J9)

If you need to disable the PCI audio accelerator (DSP) move jumper J9 from pins 1-2 (EN) to pins 2-3 (DIS).

Audio disabling (J10)

The on-board audio system can be disabled by removing jumper J10 from pins 1-2 (EN) to pins 2-3 (DIS). Disabling the audio system frees the interrupt and DMA channel used by that system (normally IRQ5 and DMA1).

BIOS upgrade and reprogram (J12, J2)

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 jumper J12 to the 2-3 (CLR) position for a few moments while the system is turned off and the power cord removed, then returning it to the 1-2 (NOR) position. It must be returned to normal before the power is reconnected.

BIOS reprogramming (J2) requires special software.

J12 - Clearing CMOS1-2*   CMOS battery connected (default)
 2-3CMOS battery disconnected
J2 - BIOS reprogramming     1-2Enabled

* This jumper must be returned to the normal position before reconnecting the power cord.

Fan Connectors, PL3 & PL2

Pins   CPU Fansink PL3   Pins   Main fan PL2   
2+ 12v 2+ 12v (controlled)*
3Fan Fail3Fan Fail

* This voltage varies to control the fan speed. This is determined from the processor’s heatsink temperature sensor.


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

Turn off the computer and unplug all power cords.
Take suitable anti-static precautions and remove the right side panel.
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.

Danger! 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.

Check that the replacement battery looks the same as the battery you have removed.
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.
Refit the right side panel.
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

ComponentsInterrupts (IRQs)
System timer                
Keyboard controller                
PIC daisy chain                
Infra-red remote control BS                
Serial port 1 BS                
Audio JS                
Diskette controller BS                
Parallel port (usually sharable)                
Real time clock                
On-board video (sharable) JS                
USB (sharable) BS                
Mouse BS                
Primary E-IDE BS                
Secondary E-IDE BS                

ComponentsDMA channels
Audio JS        
Diskette controller BS        
Parallel port (in ECP mode) BS        
DMAC daisy chain        


 Fixed assignmentBS = Can be Disabled in Bios
 Usual assignmentJS = Can be disabled by motherbaord jumper
 Alternative assignment by BIOS Setup
 Alternative assignment by Plug-and-Play            

POST Beep Codes

CodeBeepsTest which failed
161-2-2-3BIOS ROM checksum
201-3-1-1DRAM refresh.
221-3-1-38742 keyboard controller
2C xxxx       1-3-4-1RAM failure on address line xxxx.
2E xxxx1-3-4-3       RAM failure on data bits xxxx of low byte of memory bus.
30 xxxx1-4-1-1RAM failure on data bits xxxx of high byte of memory bus.
462-1-2-3Check ROM copyright notice
582-2-3-1Test for unexpected interrupts
981-2Video configuration failure, or option ROM checksum failure. (One long, two short beeps.)