VESA 80486VESA Bedienungsanleitung
Part No. 03-0023X-00
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m
Table Of Contents
Chapter
1
Introduction
What is
VESA
VL-Bus?
Advantages
of
VESA
VL.-Bus
80486VESA Motherboard Overview
80486VESA Features
Performance Report
Chapter
2
Configuration
and
Layout
Connector and Jumper Settings
CPU Selection
Cache
Memory
Configuration
VESA
VL-Bus Identifier
Motherboard
Diagram
Chapter
3
Installation and Operation
Before
You
begin
Installing
The
SIMM Modules
Memory Configuration
System Speed Change
Memory Caching
5
5
9
IO
10
11
12
12
13
14
15
15
16
16
16
20
24
25
1 Introduction
What is VESA VL-Bus?
The
VESA
VL-Bus is
a
proposal from
the
Video
Electronics
Standard Association committee. The
architecture
of the
VL-Bus
generally follows the 486 CPU local bus. Additional hardware
functions
are added to accommodate VL-Bus master devices
and
intrractinn
with
the system I/O bus. The
VL-bus
extends
the
capabilities of the
16-bit
ISA bus to
32-bus
architecture and
up
to
100Mb/sec
(at
50
MH
z
data transfer rate, while maintaining
compatibility
with
ISA
add-on
boards.
Advantage of VESA VL-Bus
Chapter 1: Introduction
80486VESA Motherboard Overview
The 80486VESA system board is a high performance, function
enchanced computer system board that combines the power of
Intel’s new 80486 CPU and the VESA VL-bus. The
board
design
includes a variety of high-powered features. Its high performance
capability can provide an ideal system board solution for a wide
range of demanding applications like CAD/CAM/CAE, database
management, image processing, artificial intelligence, desktop
publishing, and the environments of network and multiuser
systems. The 80486VESA system board fully utilizes the 32-bit
CPU power.
The 80486VESA system board also incorporates an Intel 80486
microprocessor which has an 8 KByte static RAM cache.
Included
is a four-way set associative cache controller implemented on the
80486 chip
and
an internal enhanced numeric coprocessor unit.
The system also has an option to accommodate
64KB,
128KB,
and
256KB of external cache.
Because of its unique memory subsystem design, the 80486VESA
allows for 1 Megabyte to 32 Megabytes of 32-bit high speed
memory by using
256KB,
1MB,
and/or 4MB SIMM
modules.
80486VESA
User’s Manual
3
Chapter
1:
Introduction
80486VESA Features
l Intel 80486 microprocessor
-
8
KBytes static
RAM with four-way set associative internal cache
-
Internal enhanced numeric coprocessor unit (486DX, 486DX2,
487SX,
486SX2)
l Optional 64/128/256KBytes external cache
l SIMM module memory on system board expandable from 1
Megabyte to 32 Megabytes
l Dual system speed via hardware or software selection
l System and video BIOS relocateable to RAM area for enhanced
performance
l Two 32-bit VL-Bus, two
8-bit
ISA bus and four 16-bit ISA
bus
slots
l Fast A20 implementation to speed-up multitasking operating
system
l Hidden DRAM refresh to boost system performance
l SiS-460 Single Chip
Performance Report
80486VESA-20 MHz:
l Landmark Speed Rating
l Power Meter MIPS
80486VESA-25 MHz:
l Landmark Speed Rating
l Power Meter MIPS
80486VESA-33 MI-Iz:
l Landmark Speed Rating
l Power Meter MIPS
80486VESA-50 MHz:
l Landmark Speed Rating
l Power Meter MIPS
: 91.2 MHz (Ver. 1.14)
: 8.898 MIPS (Ver. 1.3)
: 114.1
MHz
(Ver. 1.14)
:
11.136 MIPS (Ver. 1.3)
: 151.9
MHz
(Ver. 1.14)
:
14.819 MIPS (Ver. 1.3)
: 200 +
MHz
(Ver. 1.14)
: 22.271 MIPS (Ver. 1.3)
4
80486VESA User’s Manual
Chapter 2: Configuration a Layout
2
Configuration and layout
Connector and Jumper Settings
Before installing the 80486VESA system board, make sure the
connectors and jumper settings are set for your configuration.
The 80486VESA system board has two jumpers (JP9,
JP1O)
for the
CPU Type selection, and two jumpers (JP12, JP13) for the Cache
Size selection. Connectors are also provided for the front panel
interface between the system board and the computer chassis.
The functions and settings of each connector and jumper setting
are explained as follows (see Figure 1, page 11 for locations).
Front Panel Reset Connector
(JP14)
The reset button connector is a 2-pin single in-line BERG strip. It
is used to reboot the system and will allow safe re-initialization of
the system at any time. The connector should always be set in the
OFF position, otherwise the system will continually reset itself.
The pin assignments are:
JP14 Pin#
Assignment
1
Ground
2
Reset Strobe
Front Panel Turbo Connector
(JP15)
Connector
JP15
is a 2-pin single in-line BERG strip. It is the
connector for the “Turbo” processor speed which can allow you to
switch between system speeds. (Please refer to Chapter 3
“Installation
&
Operation” for a detailed description on speed
switching procedures). The pin assignments are:
80486VESA
User’s
Manual
5
JPl5
Pin#
Assignment
1
Ground
2
Turbo Control
Front Panel Turbo LED Connector
(JP16)
Connector JP16 is a
2-pin
single in-line
BERG
strip. It
can
be
connected to an LED display indicating the CPU speed.
The
display lights up when the CPU is running at full speed (Please
refer to Chapter 3 “Installation
&
Operation”for more information
about speed change). The pin assignments arc:
JP16
Pin#
Assignment
1
2
Front Panel Keylock and Power LED Connector
(JP18)
Connector
JP18
is a 5-pin single in-line
BERG
strip which
provides
for the front panel keylock and power LED connection
When
it
is
connected to a lock on your system
case
you
can
enable or
disable
the keyboard by switching
the
key.
The pin
assignments
are:
Chapter 2: Configuration and Layout
Front Panel Speaker Connector (JP17)
Connector
JP17
is a 4-pin single in-line BERG strip which provides
for the front panel speaker connection. The pin assignments are:
JP17
Pin#
Assignment
1
speaker data
2
N. C.
3
ground
4
+5
v
Power Supply Connector
(PW1)
There is a power supply connectors on-board. The pin assign-
ments are:
PWl
Pin#
Assienment
1
power good
2
+5
VDC
3
+12
VDC
4
-12 VDC
5
ground
6
ground
7
ground
8
ground
9
-5VDC
10
+5VDC
11
+5VDC
12
+5VDC
Chapter 2: Configuration and
Layout
External Battery
(JPl)
The 80486VESA motherboard provides one
external
battery
supply connector. The pin assignments are:
JP1
Pin#
Assignment
1
Battery Positive
2
No Connection
3
Ground
4
Ground
Monitor Type
(JP2)
Jumper JP2 is used to set the display type. The motherboard is
designed to work with both monochrome and color display
monitors. The pin assignments are:
JP2
Pin#
Function
1&2
(Closed)
l&2
(Open) Monochrome Monitor
Color Monitor
Keyboard Connector
(KBl)
The keyboard connector is a 5-pin DIN connector. This connector
consist of a 90-degree printed circuit board PCB mounting. The
pin assignments are:
KBl
Pin#
Assignment
8
keyboardclock
keyboarddata
spare
ground
+5
v
80486VESA User’s Manual
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