'Diamond' Motherboard (Rev 1.9.1)

Cache SIMM Socket

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

The part numbers for the Cache SIMMs available are as follows:

PT12356130 IC - SIMM 256KB ASYNC CACHE MODULE

PT12361431 CACHE - 256KB 55MHz PIPELINED SYNC

See also - Spares News / Product Update - NL0032

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

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.

Possible SIMM Memory Combinations

Ethernet Options

Disk Drives

Hard Disks

Tape Drives

Floppy Drives

CD-ROM Drives

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.

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.

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.

Floppy disk control mode

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

PL13	2 mode =
	3 mode =

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.

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.

Processor and BUS clock

These settings MUST NOT be changed except in the event of a processor upgrade. Full details of the processors required settings should accompany the new processor and the apropriate board links should then be identified from the table below.

Warning

DO NOT alter these links under normal circumstances as it could lead to the destruction of the processor and/or other vital components on the board

Soundblaster Address

PL24, PL28

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

PL24, PL28 Pinouts

Additional Options

Rear Panel

Expansion Slots

CMOS Discharge

To discharge CMOS refer to jumper Clear BIOS settings PL21 (see below)

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.

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)

Configuration / Setup Utility

Interrupts, Memory & I/O Ports

Interrupts (IRQ)

I/O Ports

 Direct memory access (DMA) channel

LED Cable Connections

Other Motherboard Connections