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PCL6000 Motherboard (Rev 1.13)


RAM Configuration

DIMM specification

Memory can be fitted in three vertical DIMM sockets which must be populated with gold contact, 3.3V, 72-bit unbuffered EDO type DIMMs having 60 ns timing.

The three DIMM slots accept DIMMs of 16, 32 and 64 Mbytes in any combination, to the maximum of 192 Mbytes.

DIMMs are not the same as those used on 'Cosworth' motherboards.

Disk Drives

MB Make Model Type Part Number
2GB IBM DORS-32160 UltraSCSI SU58303
4GB IBM DCAS-34330 UltraSCSI XB61177
1280 Quantum TM1280A IDE SU59082
2100 Quantum TM2110A IDE SU59083
3200 Quantum TM3200A IDE SU59084

Tape Drives

MB Make Model Type Part Number
12-24GB HP HP C1537A DDS III SU61220

Floppy Drives

MB Make Model Type Part Number
2 MB Mitsubishi 355F-2450MP 3.5"


MB Make Model Type Part Number
Sony CDU511-10/10 IDE PCAV XB61060
Sony CDU311-10/10 IDE SU58747

Ethernet Options

3Com PCI 3C900 triple combo card
3Com PCI 10/100TX 3C905

Jumper Settings

1 J80 - audio enable/disable 8 PL74 and PL75 - fan connectors
2 PL86 - speaker links 9 J70 - Reserved. Do not move.
3 J40 - hard disk LED select 10 J72 - battery disconnect
4 J71 - Reserved. Do not move 11 J1 to 4 - CPU clock divisor
5 J90 and J91 - SCSI setting links 12 J32 - board bus frequency
6 PL70 and PL71 - case connections 13 J30 and J31 - BIOS links
7 PL20 - front bezel daughterboard 14 J60 - floppy drive setting

Processor clock multiplier, J1 to 4

J1 J2 J3 J4 Ratio
I I I I 2:1 (2x)
I I O I 3:1 (3x) 200MHz (J32 - No fit)
I I I O 4:1 (4x)
I I O O 5:1 (5x)
I O I I 5/2 (2.5x) 166MHz (J32 - No fit)
I O O I 7/2 (3.5x)
I O I O 9/2 (4.5x)
I O O O 11/2 )5.5x)
O X X I Strictly reserved
O O O O 2:1 (2x)
I=jumper fitted O=No jumper X=Don’t care

Bus speed select, J32

Frequency Jumper J32
60 MHz No jumper
66 MHz Jumper fitted *

Flash BIOS, J30 & J31

Recovery J30 Program enable J31
2-3, Normal * 1-2, Enable *
1-2, Recover 2-3, Disable

Battery backup, J72

Erase CMOS settings
1-2, Normal *
2-3, >1 sec. to discharge

Audio disable, J80

Audio J80
1-2, Enable Audio
2-3, Disable Audio *

On-board SCSI Interface, J90 & J91

Link SCSI Enable - J90 SCSI Type - J91 Link
1 - 2 Enable SCSI * Non Ultra SCSI ON
2 - 3 Disable SCSI Ultra wide SCSI * OFF

Hard drive LED, J40

J90 setting (see above) Set J40 as follows:
SCSI Disabled (IDE drives fitted) 1 - 2
SCSI Enabled (SCSI drives fitted) 2 - 3 *

Floppy Disk mode, J60

Pins Floppy options J60
1-3 & 2-4 3-mode operation
 3-4 Standard 2-mode drives *

Software control for 1.2Mb mode operation in Japan

Speakers, PL86 (if fitted)

This is only for special system cases with internal stereo speakers, the normal casing is only fitted with a single ‘beep’ type speaker, connected to PL71.
Pins Function Connection PL86
1 Stereo - Left Left speaker = pins 1 and 2
2 Audio ground  
3 Mono Mono = pins 3 and 2
4 Link Link 4 and 5 for mono
5 Stereo - Right Right speaker = pins 5 and 6
6 Audio ground  

Fan Connectors, PL73 & PL74

Pins CPU Fansink PL73 Pins Main fan PL74
1 Ground 1 Ground
2 Fan Fail 2 Controlled supply
3 + 12 volts 3 Ground

Front and panel connectors, PL70 & PL71

Row A - PL70 Pins Row B - PL71
Power (PSU control) 1 Standby switch
Power return 2 Standby switch return
(Connected to pin 6) 3 Vcc
Keyed 4 Keyed
Hard disk LED signal 5 IRDA input
Hard disk LED pullup 6 Ground
Ground 7 IRDA output
Keylock switch 8 Ground
Keylock switch return 9 Not used
Power on LED signal 10 Not used
Power on LED return 11 Speaker out (BEEP)
Standby LED signal 12 Message LED signal
Standby LED return 13 Message LED pullup
Reset switch return 14 Not used
Reset switch 15 Not used

Front panel connector, PL20

Analogue ground 1 2 KEYED
No connection 3 4 No connection
No connection 5 6 No connection
Message LED (control 2) 7 8 No connection
Message LED (control 1) 9 10 5 V supply (fused)
IR transmit 11 12 RTS
IR receive 13 14 Digital ground

  * - Default

Additional Options

Server Products

1 x 16MB 72-bit DIMM module XB59883
1 x 32MB 72-bit DIMM module XB59884
1 x 64MB 72-bit DIMM module XB59885
DPT 2144uw single channel raid XB59886
APC 420v/s Smart-UPS XB59898

Desktop Products

V32 data/fax/voice modem. XB55987
V34 data/fax/voice modem. XB57689
Video Memory
1MB to 2MB EDO DRAM Upgrade XB57374
Graphics Cards
Matrox MGA Millenium PCI, 4MB WRAM, (See Note below) XB57212
SCSI Cards
SCSI card add-in (No HD Support) SA50160
Adaptec 2940 PCI SCSI card UD55556
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 adaptor XB54611
8 port modular terminal adaptor (7 RS232, 1 PARALLEL) XB54612
Audio Options
Apricot Deepsound Subwoofer XB58090
20W Powered external speakers XB55607
Wave Table Card XB57690

Rear Panel


1 Rear of expansion bay 9 Handles to assist side panel removal
2 Not fitted on this model *1 10 Security loop for cable or padlock
3 Parallel or printer port 11 AC power output for monitor
4 Serial port 2 12 AC power input from supply
5 Serial port 1 13 Protection cover for PSU fan *2
6 PS/2 port for mouse 14 Main side panel locking
7 PS/2 port for keyboard  
8 USB port for future use A - Panel fixing screws
*1 A high grade video board is fitted into one of the PCI expansion slots *2 DO NOT use this to lift the system

Replacing CMOS Battery

The battery is a 3 volt lithium type (CR2032 or equivalent) typically used in calculators, watches and other small, battery-powered electronic items. The average battery life is between 3 and 5 years.

Read carefully the following instructions before commencing work.

1. Turn off the computer and unplug all power cords. Take suitable anti-static precautions and remove the system unit cover.

2. Identify the battery holder.

3. Carefully disconnect and remove any expansion cards that may obstruct easy access to the battery. Take note of any cable positions before removal.


Do not use a metal or other conductive implement to remove the battery. If a short-circuit is accidentally made between its positive and negative terminals, it may cause the battery to explode.

4. Lift the edge of the battery far enough to clear the base of the holder, then slide the battery from under the contact spring.

5. Taking care not to touch the top or bottom surface of the battery, pick up the replacement with the positive (+) terminal upwards and slide the battery into the holder from the same side the old battery was removed.

6. Replace any expansion cards you had to remove in step 4 and replace the system unit cover.

7. Dispose of the old battery according to the makers instructions.

When you next turn on the computer you will have to run the BIOS Set-up utility to enter the hardware configuration. See ‘System BIOS and set-up’ for guidance.

Setup Screens

Interrupts (IRQ)

IRQ Default assignment Available?
IRQ0 System timer No
IRQ1 Keyboard controller No
IRQ2 System No
IRQ3 Serial port 2 Optionally
IRQ4 Serial port 1 Optionally
IRQ5 Audio (if fitted) Yes
IRQ6 Diskette controller No
IRQ7 Parallel port Optionally
IRQ8 Real time clock No
IRQ9   Yes
IRQ10   Yes
IRQ11   Yes
IRQ12 Mouse No
IRQ13 Coprocessor No
IRQ14 Primary ATA/IDE interface Optionally
IRQ15 Secondary ATA/IDE interface Optionally
IRQ3 is available if you disable serial port 2 with the BIOS Setup utility.
IRQ4 is available if you disable serial port 1.


Direct memory access (DMA) channel

DMA Default assignment Available?
DMA0   Yes
DMA1 Default (8 bit) Audio Optionally
DMA2 Diskette/floppy disk controller No
DMA3 Enhanced Capabilities Port (default) Optionally
DMA4 System No
DMA5 Default (16 bit) Audio Optionally
DMA6   Yes
DMA7   Yes

I/O Ports

I/O ports Default assignment
000h-01Fh DMA controller 1
020h-021h Interrupt controller 1
034h, 038h, 03Ch Alternate Local bus ATA/IDE
040h-05Fh System timer
060h-06Fh Keyboard controller
070h-07Fh Real-time clock, NMI mask
080h-09Fh DMA page register
0A0h-0A1h Interrupt controller 2
0B4h, 0B8h, 0BCh Local bus ATA/IDE
0C0h-0DFh DMA controller 2
0F0h, 0F1h Math coprocessor busy (clear/reset)
0F8h-0FFh Math coprocessor
1F0h-1F7h Hard disk drive controller
200h-207h Game I/O (disable)
220h-22Fh, 230h-233Fh Sound blaster system
240h-24Fh, 250h-253Fh Alternate Sound blaster system
278h-27Fh Parallel port 2
2B0h-2DFh Alternate VGA
2F8h-2FFh Serial port 2
300h-301Fh Alternate MIDI (disable)
330h-331Fh MIDI
378h-37Fh Parallel port 1
388h-38Fh FM synthesiser
3B0h-3BFh Monochrome display and printer adapter
3B4h, 3B5h, 3BAh Video subsystem
3C0h-3C5h VGA
3C6h-3C9h Video DAC
3F0h-3F7h Diskette drive controller
3F8h-3FFh Serial port 1

Base memory address

Some expansion cards are fitted with memory of their own, usually read-only memory (ROM) containing functional extensions to the computer’s BIOS (basic input/output system) ROM. Some cards also have random-access memory (RAM).

In order that this memory can be recognised by the system processor, it must be mapped somewhere within the computer’s own address space. By setting the base memory address you specify where the card’s memory begins within the address space. Typically, an expansion card’s memory must be mapped onto the addresses between C8000h and DFFFF in upper memory. With most modern expansion cards this is fully automatic.

The card’s documentation should list its possible base memory addresses. You will also need to know how much memory the card has, so that you can leave the right gap between this card’s base address and the next.

Cards often come with pre-configured or default settings. It is best to rely on these settings as much as possible, and change them only if they conflict with other devices.

Beep codes

No beeps. If no beeps are heard at all the speaker may be disconnected or there may be a speaker circuitry fault.

One short beep. Marks the completion of POST and no functional errors found. You will also get a single beep if you press an invalid key for a power-on password.

Two short beeps. Indicates and draws your attention to an error during POST. This should be accompanied by an error message.

Three short beeps. System memory error, normally accompanied by code 201. Beeps are used when the video cannot display the code.

Continuous beep. Could indicate a serious failure of the system motherboard, or a failure of the speaker circuitry.

Repeating short beeps. Usually indicative of a keyboard key stuck down, but may be due to the keyboard interface failing.

One long and one short beep. POST has detected an error on the video adapter in the system. There may be no display on the screen.

One long and two short beeps. This means that either the video system is faulty, or that a video I/O adapter ROM is not readable.

Two long and two short beeps. The video subsystem cannot be supported by the main system POST. This can occur when the video subsystem is replaced or changed on site.

Many of these following codes indicate a serious fault and the system may halt. Switch off for 20 to 30 seconds and try again. If the fault persists, make a note of it and call your maintenance provider.

Number of beeps Meaning
1-1-3 CMOS write/read test failure
1-1-4 BIOS ROM checksum failure
1-2-1 Programmable Interval Timer test failure
1-2-2 DMA initialisation failure
1-2-3 DMA page register read/write test failure
1-2-4 RAM refresh verification failure
1-3-1 First 64K RAM test failure
1-3-2 First 64K RAM parity test failure
1-3-3 Slave DMA register test failure
1-3-4 Master DMA register test failure
1-4-1 Master interrupt mask register test failure
1-4-2 Slave interrupt mask register test failure
1-4-4 Keyboard controller test failure
2-2-2 Search for video ROM test failure
2-2-3 Screen believed inoperable
2-2-4 Timer tick interrupt test failure
2-3-1 Interval timer channel 2 test failure
2-3-3 Time-of -day clock test failure
2-4-3 CMOS memory size against actual compare failure
2-4-4 Memory size mismatch occurred

Error Messages

If you get an error which is not listed or the problem persists, call your maintenance provider.

Code Cause Code Cause
0 Keyboard locked 301 Keyboard clock line failure
062 Boot failure. Default values loaded 301 Keyboard data line failure
101 Timer tick interrupt failure 301 Keyboard stuck key failure
102 Timer 2 test failure 303 Keyboard controller failure
106 Diskette controller failure 604 Diskette drive 0 failure
110 System board memory parity interrupt 604 Diskette drive 1 failure
114 Option ROM checksum failure 605 Diskette unlocked problem
151 Real time clock failure 662 Diskette drive configuration
161 Real time clock battery failure 762 Coprocessor configuration
162 CMOS RAM checksum failure 962 Parallel configuration
162 Invalid configuration information 1162 Serial configuration
163 Time of day not set -preboot 1762 Hard disk configuration
164 Memory size does not match CMOS 1780 Fixed disk 0 failure
165 Add/remove MC card 1781 Fixed disk 1 failure
166 Memory configuration change 1782 Fixed disk 2 failure
175 Bad EEPROM CRC #1 1783 Fixed disk 3 failure
176 System tampered 1800 No more IRQ available
177 Bad PAP checksum 1801 No more room for option ROM
178 EEPROM is not functional 1802 No more I/O space available
183 PAP update required 1803 No more memory <1Mb available
184 Bad POP checksum 1804 No more memory >1MB available
185 Corrupted Boot sequence 1805 Checksum error or 0 size option ROM
186 Hardware problem 1806 PCI-PCI bridge error
187 VPD S/N not set 1962 No bootable device
188 Bad EEPROM CRC #2 2400 Display adapter failed ; using alternate
189 Excessive password attempts 2462 Video configuration
201 Base memory error 5962 IDE CD-ROM configuration
229 External cache failure 8601 Pointer device failure
301 Keyboard failure 8603 Pointer device has been removed

PSU Wiring


The psu should be tested to conform to the design specification parameters set out in the Design Specification :-


Parameter Current Range Range Minimum Nominal Maximum
+12v DC 0.0A to 10.0A +12v 5% +11.40v +12.00v +12.60v
+5v DC 1.5A to 22.0A +5v 5% +4.75v +5.00v +5.25v
+3v3 DC 0.3A to 14.0A +3v3 5% +3.15v +3.30v +3.45v
-5v DC 0.0A to 0.5A -5v 10% -4.50v -5.00v -5.50v
-12v DC 0.0A to 0.8A -12v 10% -10.80v -12.00v -13.20v

Power Good Signal

At Power Up:

Power good should go valid within 100mS and 500mS of the +5V signal reaching 4.75V

At Power Down:

Power good should go fails at least 1mS before the +5V signal goes below the regulation limits


Computing for a Connected World