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Apricot Mustang Motherboard

Front View

Desktop Case - Front View 

1. Power Mode light8. Line In socket
2. Power buttonCD Eject button9. Headphones socket
3. Front bezel door10. Universal Serial Bus (USB) port
4. Message Button (and light)11. FireWire port (factory option)
5. CD-ROM12. S-Video In port (factory option)
6. Diskette drive13. Composite Video In port (factory option)
7. Infra-red sensor  

Rear View

Desktop Case - Rear View
1. Casing screws for the top cover10. Keyboard port
2. AC power outlet for monitor11. Mouse port
3. Voltage selection switch12. Parallel (printer) port
4. AC power inlet from AC supply13. TV Out port (factory option)
5. Universal Serial Bus (USB) port14. Monitor port
6. Speaker socket15. Modem port
7. Line Out socket16. SPDIF digital audio output (factory option)
8. Microphone socket17. MIDI/Joystick port
9. Seria port18. Security loop for cable or padlock


Mustang Motherboard Diagram
1. Video memory upgrade socket16. SPDIF internal connector
2. Motherboard power connector17. 1.44 Mbyte diskette drive connector
3. PSU logic connector18. Speakerphone modem audio connector
4. Riser Board connector19. Joystick/MIDI internal connector
5. VFC/AMC video feature connector     20. Universal Serial Bus (USB) port
6. TV tuner/MPEG-2 card connector21. Speaker socket
7. DIMM sockets22. Line Out socket
8. Processor ZIF socket23. Microphone socket
9. Front panel connectors24. Serial port
10. CMOS battery25. Keyboard port
11. Front panel USB internal connector26. Mouse port
12. Primary E-IDE connector27. Parallel (printer) port
13. Secondary E-IDE connector28. TV Out (S-Video) port (factory option)
14. "Wake on Call"" modem connector29. Monitor port
15. CD audio connector  


The motherboards two DIMM sockets accept DIMMs of up to 128 Mbytes in any combination (giving a maximum memory capacity of 256 Mbytes)

Technical Note

The DIMMs you use must have the following specification: gold contacts, 3.3V, 64-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.


Cannot be Upgraded

Video RAM

Cannot be Upgraded

Processor Upgrade (MS500 MW)

This section covers processor upgrades for the MS500 with the model number prefix MW.

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.

MS500 (MW) Processor upgrades
Processor type and speed       Is it supported?
Pentium 166 MMXYES - Set speed jumpers correctly
Pentium 200 MMXYES - Set speed jumpers correctly
Pentium 233 MMXYES - Set speed jumpers correctly

Processor Speed Jumper Table

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

MS500 (MW) Motherboard Processor Speed Jumper Settings.

Processor Speed Jumper Settings Diagram

Jumper Settings

On-board video disabling (J50)

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 the jumper in block J50 to pins 2 - 3.

Audio disabling (J80)

The on-board audio codec can be disabled bt moving the jumpers on jumper block J80 to pins 2 - 3. Disabling the audio system frees the interrupts and DMA channels used by that system (normally IRQ5, IRQ11, DMA0 and DMA1).

BIOS Upgrade

For MW (MS500) model machines, the latest version of the BIOS is 11.01.

Once the BIOS update file has been downloaded & saved in your C:\WINDOWS\TEMP folder:

Click on START
Click on RUN
Type in C:\WINDOWS\TEMP\MSTNG_15.EXE (this will create three files in your C:\WINDOWS\TEMP folder).
Place a blank formatted disk into the floppy drive A:
Click on START
Click on RUN
When the boot disk has been created, restart the computer and boot from the diskette. When the BIOS update has completed, remove the diskette and restart the computer.


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.
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.

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) BS                
Real time clock                
On-board video (sharable) JS                
USB (sharable) 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 by BIOS Setup
   Usual assignmentJS = Can be disabled by changing a motherboard jumper setting
   Alternative assignment by BIOS Setup 
   Alternative assignment by Plug-and-Play          

Beep Codes

CodeBeepsTest which failed
161-2-2-3     BIOS 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 xxxx1-3-4-3RAM 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.)