DFI EB3486-TN User Manual
EB3486-TN
Station Board
User's Manual
- D19431126 -
v Copyright 1993, by DFI Inc.
All rights reserved.
No part of this document may be copied or reproduced
in any form or by any means without the prior written
consent of DFI, Inc.
DFI, Inc. makes no warranties with respect to this
documentation and disclaims any implied warranties of
merchantability, quality, or fitness for any particular
purpose. The information in this document is subject to
change without notice. DFI, Inc. reserves the right to
make revisions to this publication and to make changes
to any and/or all parts of its content, at any time,
without obligation to notify any person or entity of such
changes. Further, DFI, Inc. assumes no responsibility
for any errors that may appear in this document.
DFI is a registered trademark and EB3486-TN is a
trademark of Diamond Flower Inc. All other product
names mentioned are trademarks or registered trademarks of their respective companies.
v FCC Statement on Class B
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is operated in a residential
installation. This equipment generates, uses, and can
radiate radio frequency energy and if not installed and
used in accordance with the instruction manual may
cause harmful interference to radio communications.
However, there is no guarantee that interference will
not occur in a particular installation. If this equipment
does cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
receiver.
• Connect the equipment into an outlet on a circuit
different from that to which the receiver is con-
nected.
• Consult the dealer or an experienced radio TV
techni-
cian for help.
Notice:
(1) The changes or modifications not expressly ap-
proved
by the party responsible could void the user’s au-
thor-
ity to operate the equipment.
(2) Shielded interface cables must be used in order to
comply with the emission limits.
v Table of Contents v
Introduction.......................................................................................
Features and Specifications .......................................................
Installation Overview ......................................................................
Preparing the Area .....................................................................
Handling the System Board .......................................................
Tips in Handling the System Board ....................................
Installing the System Board .......................................................
Hardware Installation ......................................................................
Memory Installation ....................................................................
Installing the Modules ..........................................................
Board Configuration ...................................................................
Jumper Settings ...................................................................
CPU Modules ....................................................................................
DBII-486SX/DX/DX2 CPU Modules ...........................................
DBII-486C Rev. 0 CPU Modules ...............................................
DBII-486C Rev. B CPU Modules ...............................................
Initial Setup Program ......................................................................
AMI BIOS Setup Utilities ............................................................
Standard CMOS Setup ...................................................
Advanced CMOS Setup ......................................................
Auto Configuration with BIOS Defaults ..............................
Auto Configuration with Power-on Defaults .......................
Change Password ...............................................................
Auto Detect Hard Disk ........................................................
Hard Disk Utility ...................................................................
Write to CMOS and Exit ......................................................
Do not write to CMOS and Exit ..........................................
1-1
1-2
2-1
2-1
2-2
2-2
2-3
3-1
3-1
3-5
3-6
3-7
4-1
4-2
4-4
4-8
5-1
5-2
5-3
5-5
5-8
5-9
5-9
5-11
5-11
5-12
5-13
EISA Configuration Utility ............................................................
Overview ...................................................................................
File Structure .............................................................................
Initial Configuration ...................................................................
Main Menu .................................................................................
Step 1: About EISA Configuration......................................
Step 2: Add and Remove Boards......................................
Step 3: Change Configuration Settings.............................
Step 4: Save Configuration................................................
Step 5: View Switch/Jumper Settings................................
Step 6: Exit .........................................................................
Utilities Configuration..........................................................
Define ISA Board.................................................................
6-1
6-1
6-1
6-2
6-3
6-4
6-4
6-9
6-15
6-16
6-17
6-18
6-21
DEMM 386 Software Driver ...........................................................
Troubleshooting Checklist ...........................................................
Appendix A: Types of Modules .................................................
Appendix B: System Error Report ............................................
Appendix C: Memory & I/O Maps ..............................................
Appendix D: EISA I/O PIin Assignments...................................
Appenidx E: System Overview...................................................
Appendix F: Connector Pin Assignments ...............................
Appenidx G: AMI BIOS Hard Disk Table....................................
Appendix H: VESA VL-Bus Slot Pin Assignments..................
7-1
8-1
A-1
B-1
C-1
D-1
E-1
F-1
G-1
H-1
Read Me First
The EB3486-TN system board requires the installation of the
ECU (EISA Configuration Utility), found on the provided EISA
Configuration Utility diskette, for proper operation of this
system board.
The ECU configures the EISA devices and maintains system
parameters by storing them in the Extended CMOS Memory, so
the BIOS can initialize the system and expansion boards
inserted in the EISA slots once you power up your system.
The Extended CMOS Memory is equipped with an internal
battery that needs to be constantly charged. In a small number
of cases, the internal battery may have drained and the
information stored in the Extended CMOS Memory lost during
shipment. If this happens, you will get the message "EISA
CMOS Inoperational" when you power up your system. Simply
run the ECU software, bundled with the system board, to
reconfigure the system. Save the configuration and reboot your
system. Refer to the EISA Configuration Utility section on
page 6-1 for more detailed information.
v Introduction
The EB3486-TN is a revolutionary station board based
on our own Processor Upgradeable Microcomputer
Architecture (PUMA) platform. It's unique design
allows you to use either a 486SX, 486DX or 486DX2
CPU at any speed on the station board. This is accomplished by installing the CPU on a CPU module that
plugs directly into the station board, thus making it easy
and affordable to upgrade.
The EB3486-TN station board is equipped with one
VESA compliant local bus slot for use with local bus
video or network cards. Any future VESA local-bus
products will also work. In addition to the VESA local
bus slot, the station board also has eight 32-bit EISA
(Extended Industry Standard Architecture) expansion
slots and one CPU module slot.
EISA extends the operational capabilities of the ISA
(Industry Standard Architecture) standard while maintaining compatibility with ISA expansion boards. The
EISA Configuration Utility (ECU) must be installed and
run to configure the board and the EISA expansion
boards that will be inserted in the EISA expansion slots.
EB3486-TN
If you have a DBII-486CSX or DBII-486CDX/DX2
CPU module, the system will consist of two levels of
cache memory for fast local access of frequently accessed code and data. The first level, or internal cache,
is built-in to the CPU with 8KB of cache memory. The
second level, or external cache, can support 32KB/64KB
of cache memory using 8Kx8 (25ns) SRAMs or 128KB/
256KB of
cache memory using 32Kx8 (25ns) SRAMs. The
DBII-486SX or DBII-486DX/DX2 CPU modules only
Introduction u 1-1
PUMA Station Board
support internal cache.
The EB3486-TN station board uses 256Kx36, 512Kx36,
1Mx36, 2Mx36, 4Mx36, 8Mx36, 16Mx36 and 32Mx36
SIM modules with speeds of 70ns or 80ns. It can hold
128MB of memory onboard configurable in 30 different
sizes.
System support functions include system BIOS and
VGA BIOS Shadow RAM support, memory remapping,
seven channels of Direct Memory Access, 14 levels of
interrupts and five programmable timers.
Features and Specifications
• CPU Modules : DBII and DBVII Series
DBII Series (without external cache)
DBII-486:
25/33MHz - 486SX (PGA, PQFP)
25/33MHz - 486DX (PGA)
50/66MHz - 486DX2 (PGA)
DBII Series (with external cache)
DBII-486C: (Rev. 0/Rev. B)
DBVII Series (with Local bus VGA)
DBVII-486:
1-2 u Introduction
25/33MHz - 486SX (PGA)
25/33MHz - 486DX (PGA)
50/66MHz - 486DX2 (PGA)
20/25/33MHz - 486SX (PGA, PQFP)
25/33MHz - 486DX (PGA)
EB3486-TN
50/66MHz - 486DX2 (PGA)
Note:
Each type of 486 CPU Module, DBII-486SX/DX/DX2,
DBII-486CSX/DX/DX2 and DBVII-486SX/DX/DX2,
support all speeds of 486 CPU's. Jumpers on the CPU
module select between SX, DX, or DX2 CPU's.
PGA stands for Pin Grid Array.
PQFP stands for Plastic Quad Flatpack Package.
• Uses AMI BIOS: 27512-20 (1)
• Uses TI TACT84500 EISA chipset
• 8.25 MHz bus speed for 33/66MHz
8.33 MHz bus speed for 25/50MHz
• Uses 256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36,
8Mx36, 16Mx36 and 32Mx36 SIM modules
(70/80ns)
• Memory configurable up to 128MB
Memory configurable as 1MB, 2MB, 3MB, 4MB,
6MB, 8MB, 9MB, 10MB, 11MB, 12MB, 14MB,
16MB, 20MB, 24MB, 28MB, 32MB, 36MB, 40MB,
44MB, 48MB 56MB, 64MB, 68MB, 72MB, 80MB,
96MB, 100MB, 104MB, 112MB or 128MB.
• External cache organization: direct map, write
through (DBII-486CSX/DX/DX2 CPU modules
only)
• Supports Page mode and write buffer
• Supports system BIOS and VGA BIOS Shadow
RAM function
• Memory remapping supported
• Supports hidden refresh mode
• Supports 14 edge-triggered or level triggered
interrupts
• Eight 32-bit EISA slots, one CPU module slot and
one VESA VL-bus slot (slave mode)
• Six layer PCB for the station board
• Baby AT size (station board)
• One year limited warranty
Introduction u 1-3
PUMA Station Board
v Installation Overview
This chapter summarizes the steps in installing your
EB3486-TN system board into your system unit. It also
includes a description of the area in which you must
work. Before installing the system board, determine the
size of memory you need onboard. Please refer to the
memory chart on page 3-3 and 3-4 for the memory size,
type and quantity of SIM modules needed.
Preparing the Area
Before unpacking the system board, make sure the
location you have selected provides a relatively dust- and
static-free environment. Excessive exposure to dust,
static electricity, direct sunlight, excessive humidity,
extreme cold or water can damage your system board or
greatly reduce its operational abilities.
Be sure that the power source has a properly grounded,
three-pronged socket. It is essential that the power
connection be properly grounded for correct functioning
of your system board. Use a surge protector to shield
the system from damage that may result from a power
surge on the line.
Air circulating around the system unit cools your system.
Please ensure adequate air circulation around the entire
unit and do not block the fan vent on the back of the
unit.
Once you have selected the ideal location, unpack the
EB3486-TN system board carefully.
2-1 u Installation Overview
Handling the System Board
It is quite easy to inadvertently damage your system
board even before installing it to your system unit.
Static electrical discharge can damage your system board
even though there are no signs of physical damage. The
damage may show up as a malfunction when you try to
operate the machine, or it may result in premature
failure. Take due care in handling the system board to
make sure that no static build-up is present.
Tips in Handling the System Board
1) To prevent electrostatic build-up, leave the board in
its anti-static bag until you are ready to install it.
2) To ground yourself, place your hand on any bare
metal part of the system chassis.
3) Hold the system board by its edges only. Be careful
not to touch any of the components, contacts or
connections on the station board.
EB3486-TN
4) Avoid touching the metal pins on modules and
connectors. Hold modules and connectors by their
edges.
Installation Overview u 2-2
PUMA Station Board
Installing the System Board
Follow the instructions below to install the system
board.
You will need:
• one medium size, flat-bladed screwdriver
• one medium Philips screwdriver
Step 1: Unlock your system unit. Turn off the power
and disconnect all power cords and cables.
Step 2: Remove the system mounting screws from
the rear and/or sides of the system
unit.
Step 3: Remove the system unit cover by sliding the
top of the case forward and then lifting it up.
If you are replacing your current motherboard
with the EB3486-TN station board, perform
steps 4 and 5. If this is a new system, skip to
step 6.
Step 4: Remove expansion cards seated in any of the
expansion slots and detach all connectors
from the old system board.
Step 5: Loosen the screws holding the original
system board and remove the board from
the system. Save the screws.
Step 6: Insert the SIM modules into SIMM banks on
the EB3486-TN. The quantity and location
of the SIM modules is dependent upon the
2-3 u Installation Overview
EB3486-TN
memory configuration and the type of
modules you intend to use.
Step 7: Set the corresponding jumpers.
Step 8: Fasten the screw into the CPU Module and
the L-shape bracket. Insert the CPU module
into the slot, and then, under the system
board, fasten the screw into the system
board and the L-shape bracket which is
attached to the CPU Module. Please refer to
the picture below:
Step 9: Install the prepared EB3486-TN system
board into the case and replace the screws.
Step 10: Reattach all cards and connectors and replace
the system unit cover. Reconnect all power
Installation Overview u 2-4
PUMA Station Board
cords and cables.
v Hardware Installation
Computer components are easily damaged by static
electricity. Static electrical discharge can damage your
system board, even though there are no signs of physical
damage. Be careful to handle the system board by its
edges. Do not touch any part of the circuitry, especially
the gold contacts, with your hands. Do all the preparation work on a static-free surface. Place the system
board on a static-free table with the components facing
up.
Memory Installation
The EB3486-TN system board can support 1MB to
128MB of memory using HSIMMs. HSIMM is an
acronym for High Density Single In-line Memory Module. A HSIMM consists of several RAM chips soldered
onto a small circuit board. A HSIMM connects with the
system board via a 72-pin card-edge connector.
The HSIMM sockets are divided into four banks which
are located on the main board. The SIM modules are
plug into the banks at the upper-left side of the station
board.
You will need 1 to 4 pieces of HSIM modules, depending on the amount of memory you intend to install.
Your system board can be configured to 1MB, 2MB,
3MB, 4MB, 6MB, 8MB, 9MB, 10MB, 11MB, 12MB,
14MB, 16MB, 20MB, 24MB, 28MB, 32MB, 36MB,
40MB, 44MB, 48MB, 56MB, 64MB, 68MB, 72MB,
80MB, 96MB, 100MB, 104MB, 112MB or 128MB of
onboard memory.
3-1 u Hardware Installation
EB3486-TN
To install the HSIM modules, first populate Bank 1,
then Bank 2 and so on. Failure to do so will cause the
system board to work improperly.
VESA Slot
CPU MODULE
l
BANK 0
l
BANK 1
l
BANK 2
l
BANK 3
Location of the SIMM Sockets on the Station Board
The following table summarizes the bank locations and
modules needed for corresponding memory sizes. Each
bank consists of 1 HSIMM socket.
Memory Bank 0 Bank 1 Bank 2 Bank 3
Size
1M 256K x 36 - - 2M 256K x 36 256K x 36 - 2M 512K x 36 - - 3M 256K x 36 256K x 36 256K x 36 4M 256K x 36 256K x 36 256K x 36 256K x 36
4M 512K x 36 512K x 36 - 4M 1M x 36 - - 6M 512K x 36 512K x 36 512K x 36 8M 512K x 36 512K x 36 512K x 36 512K x 36
Hardware Installation u 3-2
PUMA Station Board
8M 1M x 36 1M x 36 - 8M 2M x 36 - - -
9M
2M x 36
256K x 36 - -
Memory Bank 0 Bank1 Bank 2 Bank 3
Size
10M 2M x 36 256K x 36 256K x 36 10M 2M x 36 512K x 36 - 11M 2M x 36 256K x 36 256K x 36 256K x 36
12M 2M x 36 512K x 36 512K x 36 12M 2M x 36 1M x 36 - 12M 1M x 36 1M x 36 1M x 36 14M 2M x 36 512K x 36 512K x 36 512K x 36
16M 2M x 36 1M x 36 1M x 36 16M 2M x 36 2M x 36 - 16M 1M x 36 1M x 36 1M x 36 1M x 36
16M 4M x 36 - - 20M 2M x 36 2M x 36 1M x 36 20M 4M x 36 1M x 36 - 24M 2M x 36 2M x 36 1M x 36 1M x 36
24M 4M x 36 1M x 36 1M x 36 24M 4M x 36 2M x 36 - 24M 2M x 36 2M x 36 2M x 36 28M 4M x 36 1M x 36 1M x 36 1M x 36
32M 2M x 36 2M x 36 2M x 36 2M x 36
32M 4M x 36 4M x 36 - 32M 8M x 36 - - 32M 4M x 36 2M x 36 2M x 36 36M 4M x 36 4M x 36 1M x 36 36M 8M x 36 1M x 36 - 40M 4M x 36 2M x 36 2M x 36 2M x 36
40M 4M x 36 4M x 36 1M x 36 1M x 36
40M 4M x 36 4M x 36 2M x 36 -
40M
3-3 u Hardware Installation
EB3486-TN
64M 8M x 36 8M x 36 - -
64M 8M x 36 4M x 36 4M x 36 68M 8M x 36 8M x 36 1M x 36 -
Memory Bank 0 Bank1 Bank 2 Bank 3
Size
64M 16M x36 - - 72M 8M x 36 8M x 36 1M x 36 1M x 36
72M 8M x 36 8M x 36 2M x 36 80M 8M x 36 4M x 36 4M x 36 4M x 36
80M 8M x 36 8M x 36 2M x 36 2M x 36
80M 16M x 36 4M x 36 - 96M 8M x 36 8M x 36 8M x 36 96M 16M x 36 4M x 36 4M x 36 100M 8M x 36 8M x 36 8M x 36 1M x 36
104M 8M x 36 8M x 36 8M x 36 2M x 36
112M 8M x 36 8M x 36 8M x 36 4M x 36
112M 16M x 36 4M x 36 4M x 36 4M x 36
128M 8M x 36 8M x 36 8M x 36 8M x 36
128M 16M x 36 8M x 36 8M x 36 128M 16M x 36 16M x 36 - 128M 32M x 36 - - -
Bank Locations and Modules Needed
Hardware Installation u 3-4
PUMA Station Board
Installing the Modules
HSIMMs simply snap into a socket on the system board.
Pin 1 of the HSIMM must correspond with Pin 1 of the
socket.
1. Position the HSIM modules above the HSIMM
socket with the chips of the module facing the
center of the system board.
2. Seat the module into the bank. Make sure it is
completely seated in its socket before pressing the
module securely into the bank as shown above.
3-5 u Hardware Installation
Board Configuration
The EB3486-TN is designed with jumpers and connectors onboard. Make sure that the jumpers are set correctly before installing the system board into your
system unit.
EB3486-TN
J18
J4
J1
J6
J2
J3
J14
J7
J15
CPU Module
J19
J16
J17
J20
VESA Slot
J13
J8
l
l
l
l
Location of Jumpers and Connector Pins
on the EB3486-TN
PL1
J11
PL2
J12
J10
Hardware Installation u 3-6
PUMA Station Board
Jumper Settings
Jumper J8
Primary Display Selector
This jumper must match the type of display adapter
installed. If you change your video adapter, change this
jumper accordingly.
1 2 3
1-2 On: Color Display 2-3 On: Mono Display
(Default)
Jumper J7, J14 to J17, J19
CPU Module Select
Set the following jumpers according to the type of CPU
module installed on the station board. 486 refers to
486SX/DX/DX2 CPUs.
1 2 3
J7 J14 J15 J16 J17 J19
486 1-2 On 1-2 On 1-2 On 1-2 On 1-2 On 1-2 On
3-7 u Hardware Installation
EB3486-TN
1
2
3
1-2: On
1
2
3
2-3: On
The jumpers below are for factory testing only and
should always be set to their default configuration.
Recon-figuring these jumpers will cause problems with
your EB3486-TN system board.
Jumper J3: 2-3 On
Jumper J13: Off
Jumper J20: On
Jumper J18: 1-2 On
Note:
There are no jumpers on this board to select between
internal and external batteries. The Dallas Real-time
clock we use has an battery built into the chip,
precluding the use of a battery on the system board.
Hardware Installation u 3-8
PUMA Station Board
v CPU Modules
The EB3486-TN station board comes with a CPU
module that is inserted in the CPU Module local-bus slot
on the station board. The types of CPU modules available are DBII-486SX/DX/DX2 and DBII-486C (SX/
DX/DX2). These modules support many of the CPU
speeds available in each CPU class. The CPU modules
are also equipped with sockets for coprocessors and are
easy to install, thus making upgradability easy and
affordable.
CPU MODULE local-bus slot
l
l
l
l
Location of the CPU Module Local-Bus Slot on the EB3486-TN
4-1 u CPU Modules
DBII-486SX/DX/DX2 CPU Modules
The following CPU's are supported by this module: 25/
33MHz 486SX, 25/33MHz 486DX and 50/66MHz
486DX2. An 80487SX and Weitek 4167 are also supported. If you have a 486SX CPU installed, an overdrive
processor could also be installed at a later date.
EB3486-TN
U1
U5
U6
J3
J5
J2
J4
J1
J6
J7
J8
DBII-486SX/DX/DX2 CPU Module
The DBII-486SX/DX/DX2 CPU Module has three
sockets: U1 (socket for 487SX/OverDrive Processor),
U5 (socket for 486SX/DX/DX2), U6 (socket for
WTL4167).
CPU Modules u 4-2
PUMA Station Board
Jumper Settings
Jumpers JP2/JP3/JP4
CPU Select
Jumpers JP2/JP3/JP4 set the CPU modules to 486SX,
486DX or 486DX2, depending on which type of CPU is
installed. The default setting is 486DX.
486SX 486DX* 486DX2
JP2 2-3: On 1-2: On 1-2: On
JP3 2-3: On 1-2: On 1-2: On
JP4 2-3: On 1-2: On 1-2: On
1
2
3
1
2
3
1-2: On
Jumpers JP7/JP8
CPU Clock Select
4-3 u CPU Modules
2-3: On
EB3486-TN
Set these jumpers according to the speed of CPU installed
on the CPU module. The default setting is 33MHz.
25MHz 33MHz*
JP7 2-3: On 1-2: On
JP8 1-2: On 1-2: On
1
2
3
1
2
3
1-2: On
The jumpers below are for factory testing only and
should always be set to their default configuration.
Jumpers JP1/JP5/JP6: 2-3 On
* Default setting
DBII-486C Rev. 0 CPU Modules
The DBII-486C Rev. 0 CPU Module supports the same
CPU speeds as the DBII-486SX/DX/DX2 CPU
modules. This CPU Module also supports up to 256K
of external cache.
2-3: On
CPU Modules u 4-4
PUMA Station Board
U1
The DBII-486C Rev. 0 CPU Module has two sockets:
U1 (socket for 486DX, 486DX2, 486SX and 487SX/
OverDrive Processor), U9 (socket for Weitek
Coprocessor).
Jumper Settings
U9
J2
J1 J3
J9
DBII - 486C Rev. 0 CPU Module
J10
J5
J4 J6
J7
J8
Jumpers JP1 to JP3
CPU Select
Jumpers JP1/JP2/JP3 set the CPU module to 486SX,
487SX, or 486DX/DX2, depending on which type of
CPU is installed. The default setting is 486DX.
486DX/DX2* 1-2: On 1-2: On 2-3: On
486SX Off Off 1-2: On
OverDrive 1-2: On 2-3: On 2-3: On
Processor
4-5 u CPU Modules
JP1 JP2 JP3
JP1 JP2 JP3 JP2 JP3JP1
On
* Default setting
Cache Configuration
You can configure DBII-486C Rev. 0 to three different
cache sizes: 64K, 128K, and 256K. 256K is the default
size. Use either 8K x 8 (25ns) or 32K x 8 (25ns)
SRAMs to upgrade your cache size. The figure below
shows the location of the SRAM sockets.
U1
EB3486-TN
1
2
3
Off
1
2
3
2-3: On1-2: On
U13
U14
U9
U15
U16
U17
U18
U19
U20
CPU Modules u 4-6
PUMA Station Board
Cache Size U13 - U16 U17 - U20
64K 8K x 8 (25ns) 8K x 8 (25ns)
128K 32K x 8 (25ns) none
256K* 32K x 8 (25ns) 32K x 8 (25ns)
Jumper Settings for Cache Memory
Jumpers JP4 to JP8
Cache Size Setting
JP4 JP5 JP6 JP7 JP8
64K 2-3: On 2-3: On 2-3: On 1-2: On 1-2: On
128K 1-2: On 1-2: On 2-3: On 2-3: On N/A
256K* 1-2: On 1-2: On 1-2: On 2-3: On 2-3: On
The jumpers below are for factory testing only and should
always be set to their default configuration.
Reconfiguring these jumpers will cause problems with
your EB3486-TN system board.
Jumpers JP9 and JP10: 1-2 On
* Default setting
4-7 u CPU Modules
DBII-486C Rev. B CPU Modules
The DBII-486C Rev. B CPU Module supports the same
CPU speeds as the DBII-486C Rev. 0 CPU modules.
ZIF
Socket
U1
EB3486-TN
J2
J3J1
J9 J10
J4
J5 J7
J8
J6
DBII - 486C Rev. B CPU Module
The DBII-486C Rev. B CPU Module has a 237 pin ZIF
socket: U1 (socket for 486SX, 486DX, 486DX2 and
487SX/Intel 486
TM
OverDrive Processor/Pentium
TM
OverDrive Processor).
Note:
DBII-486C Rev. B CPU Module does not support
Weitek coprocessor (4167).
CPU Modules u 4-8
PUMA Station Board
Jumper Settings
Jumpers JP1 to JP3
CPU Select
(Refer to DBII-486C Rev. 0 CPU module jumper settings on
page 4-5).
Jumper Block JP9 and JP10
CPU Voltage
The DBII-486C Rev. B supports 5 Volt CPUs. Optional
3.3 Volt CPUs are supported only if a regulator chip is
soldered on location U22. Set Jumper block JP9 and
JP10 according to the voltage of the CPU installed.
Warning:
If you are using a 3.3 Volt CPU, this jumper block must
be set to 3.3 Volt. Otherwise, the CPU will be
permanently damaged.
CPU Voltage JP9/JP10
* Default setting
4-9 u CPU Modules
5V CPU* 1-2: On
3.3V CPU 2-3: On
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