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Apricot Diamond Motherboard

Diamond Motherboard Diagram

Cache SIMM Socket

If your computer came without any cache fitted you can install a 256Kb module of either of the following types:-

256KB Async Cache Module
256KB 55MHz Pipelined Sync

If you have a 75MHz motherboard it will not have a cache SIMM, due to the performance benefits of EDO RAM. If you upgrade the processor at a later date you may require a cache upgrade to improve performance further.

Video RAM

If your machine came with 1MB video RAM then it can be upgraded as follows (depending on your Video Card) -

GD5434 1MB to 2MB Video RAM Upgrade
GD5436 1MB to 2MB Video RAM Upgrade

If your machine came with 2MB already installed then it cannot be upgraded further.

RAM Configuration

The SIMM sockets are located at the front of the motherboard. Each pair of sockets can be fitted with SIMMs. SIMMs with capacities of 2, 4, 8, 16 or 32 Mbytes are supported, giving a maximum capacity of 128 Mbytes.

Socket Location

RAM Socket Location

SIMMs must be fitted in pairs and the pair must be identical. The system does not require Parity checking (36-bit) SIMMs. Conventional 32-bit SIMMs with a refresh rate of 70ns is the specification. The newer Extended Data Output (EDO) type SIMMs are supported and will give enhanced performance.

Note: MS530 has only Banks 0 & 1 available for memory expansion.


Adding RAM is the most cost effective way to boost your computer's performance.


Processor Upgrade

These are is the processor upgrades for MS530's and MS540's with the model number prefixes MK or MT.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.

Warning

DO NOT alter these links unless you are upgrading the processor as it could lead to the destruction of the processor and/or other vital components on the board.

MS530 (MK) &MS540 (MT) Processor upgrades
  
Processor type and speedIs it supported?
  
Pentium 120YES (set speed jumpers)
Pentium 133YES (set speed jumpers)
Pentium 150YES (set speed jumpers)
Pentium 166YES (set speed jumpers and upgrade BIOS)
Pentium 200YES (set speed jumpers and upgrade BIOS)
Pentium 166 MMXNO (no support for full 2.8volt MMXprocessor)
Pentium 200 MMXNO (no support for full 2.8volt MMXprocessor)
Pentium 233 MMXNO (no support for full 2.8volt MMXprocessor)
Pentium Overdrive 166 MMX (BPODPMT66X166).      
Will run at 100mhz or 133Mhz.
YES (upgrade BIOS then set speed jumpers to 100mhz or 133mhz)
Pentium Overdrive 180 MMX (BPODPMT60X180).
Will run at 75, 90, 120 & 150Mhz.
YES (upgrade BIOS then set speed jumpers to 75, 90, 120 or 133mhz)
Pentium Overdrive 200 MMX (BPODPMT66X200).
Will run at 100, 133 & 166Mhz.
YES (upgrade BIOS then set speed jumpers to 100, 133 or 166mhz)


Processor and BUS clock
Processor SpeedPL17SW1, || = Link, : = No linkISA (MHz)
Pentium P 75VREPin 1 || || : : : : : :8.33
P 90VREPin 1 : || : : || : : :7.5
P 100VREPin 1 || : : : || : : :8.33
P 120VREPin 1 : || || : || : : :7.5
P 133VREPin 1 || : || : || : : :8.33
P 150VREPin 1 : || || || || : : :7.5
P 166VREPin 1 || : || || || : : :8.33
P 200VREPin 1 || : : || || : : :8.33 (5-07 BIOS or greater)

BIOS Upgrade

For MK (MS530) and MT (MS540) model machines, the latest version of the BIOS is 5.09.

BIOS Installation Instructions

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\D509COMB.EXE
Press RETURN, then click on UNZIP (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
Type C:\WINDOWS\TEMP\IMAGE 509BIOS.IMG A: /M /B
When the boot disk has been created, restart the computer and boot from the diskette. From the menu press 1 to detect the type of video controller, and then press 2 or 3 to upgrade the BIOS for your type of video controller.

Jumper Settings

Internal speaker operation

Next to outer SIMM socket, default position link pins 4 and 5 gives audio output to the internal speaker in mono. Only to be removed in a system having internal stereo speakers.

PL2     Stereo: L Cable = 1,2. R Cable = 5,6
 Mono: Cable = 2,3. Jumper = 4,5

Internal 'audio' modem

Just along from the CD audio connection, default position if no internal modem is fitted, link pins 3 and 4. Remove only when fitting an internal modem supporting sound.

PL4     Modem absent = 3,4
 Modem present = no jumper

BIOS reprogramme

These links are for special purposes. Only to be used for an official upgrade to the system BIOS. DO NOT move for any other reason.

PL5Reserved. Do not change from 2,3
PL6     Flash Program. Enable = 1,2. Disable = 2,3

Floppy disk control mode

Next to floppy disk ribbon connector, default position link pins 3 and 4.

PL13      2 mode = Jumper PL13
 3 mode = Jumper PL13

Clear BIOS settings

Next to outer video upgrade socket, default position linkpins 1 and 2.Moving the link to pins 2 and 3 disconnects the battery from the BIOS memory, and will cause all the user settings to be lost. To be used with caution and only in the event of an access password being lost.

PL21     Normal = 1,2. Clear = 2,3.

Video / VESA option

A single jumper may be the only one fitted, at the end nearest PL21.Only needs to be removed if fitting a new high feature 'plug-in' video card and serious problems are encountered. If taken out, it must be replaced if the extra video card is subsequently removed.

PL22      Video enabled, do not alter

Sound Blaster Address

IC12     Near CD audio connector. Default position, link rear pins, sets the on-board Sound Blaster to address 220h. Removing the link changes the address to 240h

PL24, PL28

Jumpers PL24 / PL28 Location

This range of pins is not exactly for jumpers, but is used to connect various features around the system case to the motherboard.

PL24   Pins   1 to 4HDD active light
  5 to 9Keylock (not fitted)
  10 & 11   System in 'power standby' light
  12 & 13System hardware reset (not fitted)
PL28Pins1 & 2System standby restore switch
  3 to 7Infrared controller
  8,9,10Fan, slow mode
  11,12,13Fan, full speed mode
  14 to 17Internal speaker (only when no audio fitted to motherboard)

Rear Panel

Desktop Case Rear View

1 - AC Power Inlet5 - Keyboard Port   9 - Parallel Port
2 - AC Power Outlet6 - Mouse Port10 - Video Port
3 - System Security Loop   7 - Serial Port 1 
4 - Audio Ports8 - Serial Port 2 

Expansion Slots

Expansion Slots Location

Clear BIOS Settings / CMOS Discharge

To clear the BIOS. you need to move jumper PL21, which is situated next to outer video upgrade socket.By default the jumper should be set to 1-2.

Moving the link to pins 2 and 3 disconnects the battery from the BIOS memory, and will cause all the user settings to be lost. To be used with caution and only in the event of an access password being lost.

PL21     Normal = 1, 2. Clear = 2, 3

BIOS Screens

Bootup Screen

When this appears in the top right of the screen press the F1 on the keyboard and in a few seconds you will be presented with the BIOS setup screen see below)

BIOS Main Screen

System Summary Screen

Devices and IO Ports Screen

IDE Drives Setup Screen

Hard Disk Drive 0 Screen

Date and Time Screen

System Security Screen

Secure Hard Disk Drives and Diskette Drives Screen

Power-on Password Screen

Administrator Password Screen

Start Options Screen

Advanced Setup Screen

Cache Control Screen

ROM Shadowing Screen

ISA Legacy Resources Screen

Memory Resources Screen

IO Port Resources Screen 

DMA Resources Screen

Interrupt Resources Screen

Power Management Screen

Save Settings Screen

Restore Settings Screen

Load Default Settings Screen

Interrupts, Memory & I/O Ports

Interrupts (IRQ)

Interrupts    Default FunctionAvailable ?
   
IRQ 0System timerNo
IRQ 1KeyboardNo
IRQ 2CascadeNo
IRQ 3Serial port 2Optionally
IRQ 4Serial port 1Optionally
IRQ 5Audio (if fitted)Yes
IRQ 6Diskette controllerNo
IRQ 7Parallel portOptionally
IRQ 8Real time clockNo
IRQ 9Not usedYes
IRQ 10Not usedYes
IRQ 11Not usedYes
IRQ 12MouseNo
IRQ 13Co processorNo
IRQ 14Primary ATA/IDE interfaceNo
IRQ 15Secondary ATA/IDEinterfaceNo

I/O Ports

I/O ports (Hex)    Used by
  
000 - 01FDMA controller 1
020 - 021Interrupt controller 1
022 - 023ALI configuration port
034, 038, 03CLocal bus ATA/IDE (alternate)
040 - 05FSystem timer
060 - 06FKeyboard controller
070 - 07FReal time clock,NMI mask
080 - 09FDMA page register
0A0 - 0A1Interrupt controller 2
0B4, 0B8, 0BCLocal bus ATA/IDE (default)
0C0 - 0DFDMA controller 2
0F0, 0F1Math coprocessor busy (clear/reset)
0F8 - 0FFMath coprocessor
1F0 - 1F7Hard disk drive controller
200 - 207Game I/O
278 - 27FParallel port 2
2B0 - 2DFAlternate VGA
2F8 - 2FFSerial port 2
378 - 37FParallel port 1
3B0 - 3BFMonochrome display and printer adapter
3B4, 3B5, 3BAVideo subsystem
3C0 - 3C5VGA
3C6 - 3C9Video DAC
3CA - 3DFVGA
3F0 - 3F7Diskette drive controller
3F8 - 3FFSerial port 1

Direct memory access (DMA) channel

DMADefault FunctionAvailable ?
   
DMA 0      Yes
DMA 18-bit AudioOptionally
DMA 2Diskette ControllerNo
DMA 3Enhanced Capabilities Port     Optionally
DMA 4SystemNo
DMA 516-bit AudioOptionally
DMA 6 Yes
DMA 7 Yes

Error Codes

CodeCauses
  
101Timer tick interrupt failure
102Timer 2 test failure
106Diskette controller failure
110System Board Memory Parity interrupt
114Option ROM checksum failure
151Real time clock failure
161Real time clock battery failure
162CMOS RAM checksum failue
162Invalid configuration information
163Time of day not set -preboot
164Memory size does not match CMOS
175Bad EEPROM CRC #1
176System tampered
177Bad PAP checksum
178EEPROM is not functional
183PAP Update Required
184Bad POP checksum
185Corrupted Boot Sequence
186Hardware problem
189Excessive password attempts
201Base memory error
229External cache failure
303Keyboard controller failure
301Keyboard failure
301Keyboard clock line failure
301Keyboard data line failure
301Keyboard stuck key failure
604Diskette drive 0 failure
604Diskette drive 1 failure
605Diskette unlocked problem
662Diskette drive configuration
762Coprocessor configuration
1762Hard disk configuration
1780Fixed disk 0 failure
1781Fixed disk 1 failure
1782Fixed disk 2 failure
1783Fixed disk 3 failure
1800No more IRQ available
1801No more room for option ROM
1802No more I/O space available
1803No more memory (< 1MB) available
1804No more memory (> 1MB) available
1805Checksum error or 0 size option ROM
1962No bootable device
2400Display adapter failed; using alternate
2462Video configuration
5962IDE CD-ROM configuration
8603           Pointer device has been removed