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

Tape Drives

Floppy Drives

CD-ROM

Ethernet Options

Jumper Settings

Processor clock multiplier, J1 to 4

Bus speed select, J32

Flash BIOS, J30 & J31

Battery backup, J72

Audio disable, J80

On-board SCSI Interface, J90 & J91

Hard drive LED, J40

Floppy Disk mode, J60

Speakers, PL86 (if fitted)

Fan Connectors, PL73 & PL74

Front and panel connectors, PL70 & PL71

Front panel connector, PL20

  * - Default

Additional Options

Server Products

Desktop Products

Rear Panel

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.

Warning

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)

Direct memory access (DMA) channel

I/O Ports

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.

Error Messages

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

PSU Wiring

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

Regulation

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