PB430.003 /03-01-94 |0| Copyright 1991-1994 Packard Bell Electronics

PB430/440/440T UPGRADE INFORMATION

NOTE: Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.

1. MEMORY

NOTES:

• 1. SIMM speed must be 80ns or faster.
• 2. This system has two SIMM sockets which are banks 1&2 and 3&4.
• 3. The SIMM's are 72-pin and can be x32 or x36. The motherboard design does not require parity checking, hence x32 SIMMs can be purchased (they are cheaper).
• (references to vendors like Reveal edited)

*NOTE: When two 32 MB SIMMS are installed, the SMT memory needs to be disabled.

2. MATH CO-PROCESSOR-CPU UPGRADE

2.  MATH CO-PROCESSOR

NOTE:
1.  Intel has changed the designations of the 80486 OverDrive processors.  In the table below, the original designations are in parenthesis.

2.  To open the upgrade processor socket, pull the tab/lever straight up from the side of the socket (closest to the back of the motherboard) and pull towards the front.

3.  This motherboard will accommodate the P24T processor when it becomes available.

The following jumpers are used:

• J23 (Jsel2) Frequency Select Jumper
• J25 (Jsel1) Frequency Select Jumper
• J26 (Jsel0) Frequency Select Jumper
• J34 (Jcpus) CPU Type Jumper
• J40 (Jcpu2) CPU Type Upgrade 2

3. CACHE

JUMPER SETTINGS  

SURFACE MOUNT CONFIGURATIONS

NOTE:

• 1. Tag and DB are the same chip at location (U35)
• 2. Cache chips may be marked with a "256." These chips will still work as ordered, that is, 32kx8 or 8kx8; the marking does not necessarily determine the cache amount.
• 3. Cache chips may be 25ns, 20ns, or 15ns while the tag SRAM can be either 20ns or 15ns.

BLOW-UP OF CACHE SOCKETS

NOTES:

• 1. The gap between the U17 and U24 is exaggerated to show that the sockets are separate.
• 2. There are five banks total but just two are shown here. U15 shows a socket with a chip installed, and U19 shows a socket without a chip installed.

4. VIDEO MEMORY NOTES:
1.  Check with customer service for the availability of the video upgrade memory
2.  The DRAM ZIP used in this motherboard is NOT the same chip used for the PB410/420/420T systems.
3.  A VESA driver is not needed for Cirrus video.  VESA software compatibility is built into the PB430/440/440T  BIOS.

There are two versions of the PB430 motherboard.  The main difference between the two motherboards is in the Video Chip set.  One has the Cirrus Logic 5424 Video Chip Set, and the other has the Cirrus Logic 5428 Video Chip Set.

Video memory on the PB430 with a CL 5424 chip is upgradeable to 1 MB by installing a 256k x 16 Fast Page Mode DRAM ZIP (Symmetrical, CAS Line) at location U26.  The PB430 with a CL 5428 chip is upgradeable to 2 MB of video memory by adding two such DRAM ZIPs.

The part number for one such ZIP is:  MT4C16257Z

Pin 1 on the DRAM ZIP is on the "slanted" side of the chip, as shown  below:

A.  PB430 WITH CIRRUS LOGIC 5424 VIDEO CHIP SET
Pin 1 on the ZIP socket on the PB430 motherboard, is located towards the back left side of the motherboard, close to the JVESA connector:

B.  PB430 WITH CIRRUS LOGIC 5428 VIDEO CHIP SET
Pin 1 on the ZIP socket on the PB430 motherboard, is located towards the back left side of the motherboard, close to the JVESA connector:

5.  SPEAKER Use a standard 8 ohm, 1/2 watt computer speaker.  Move the cap on jumper J39 to pins 2 and 3, and attach the speaker to connector J39,  pins 1 and 4.

6.  BATTERY Use a 3.6 Volt lithium battery.  Remove the shorting cap on jumper J24.  Then attach the battery to connector J28, positive to pin 1, negative to pin 4.

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