Jetway
J-403TG Green VLB
Version 2.0
User’s Guide
by computerguy08
Contents
Chapter 1: Overview and specs
1.1: Specifications
1.2: Mainboard overview
Chapter 2: Hardware installation
2.1: CPU configuration
2.2: Cache configuration
2.3: VL BUS configuration
2.4: Memory configuration
2.5: Other features
Chapter 1: Overview and specs
Chapter 1.1: Specifications
The J-403TG has the following features:
Platform: Baby AT form factor (254mm x 218mm)
CPU type: Socket 3 for Intel or AMD 486SX/DX/DX2/DX4, as well as AMD 5x86 and Cyrix M7
CPU speeds: 25/33/40/50(internal)/66(internal)/100(internal)MHz
Chipset: OPTi 82C895
Memory: Four 30-pin SIMM and three 72-pin SIMM sockets, with support for up to 128MB
Cache: 8 DIP sockets, with support for 64/128/256KB configurations
BIOS: AMI BIOS, Award BIOS
Slots: six (6) 16-bit ISA slots, two (2) 8-bit ISA slots, three (3) VESA local bus slots
Chapter 1.2: Mainboard Overview
Function
Jumper
TURBO
switch
J1
SPEAKER connector
J3
KEYLOCK
/
POWE
R LED
conn
ector
J4
External battery
connector
J6
Memory Jumpers
JP18
CMOS clear jumper
JP15
GREEN PC hotkey
JP16
GREEN PC LED connector
JP20
RESET switch J2
TURBO LED connector J5
CPU jumpers JP1, JP9->JP13, JP21->JP33
Cache jumpers JP34, JP35, JP36, JP38
VL BUS jumpers JP7, JP8
GREEN Monitor power control JP19
Other jumper locations are unknown and/or should not be tampered with.
Chapter 2: Hardware configuration
486SX
OP OP OP OP OP 2-3 1-2 OP OP OP
486SX
(SL) CL OP OP OP OP 2-3 1-2 1-2 CL CL
486DX/
DX2 (SL) CL OP OP OP 1-2 1-2, 3-4 1-2 1-2 CL CL
CPU v
oltage
JP25
Chapter 2.1: CPU configuration
CPU
name
486DX/DX2 OP OP OP OP 1-2 1-2, 3-4 1-2 OP OP OP
486DX4 CL OP OP 1-2 1-2 1-2, 3-4 1-2 1-2 CL CL
CYRIX M7/M72 OP 1-2 OP 2-3 1-2 1-2, 3-4 2-3 2-3 OP OP
5 Volts 1-3,2-4
Adjustable*
*requires soldering an AMS1084 (or equivalent) voltage regulator and a 5kΩ potentiometer in
series with a 2.2kΩ resistor as shown in the figure below:
JP1 JP10 JP12 JP13 JP26 JP27 JP28 JP31 JP32 JP33
3-5,4-6
CPU type selector
There are 2 kinds of clock chips for this motherboard:
Cache
J
umper
settings
TAG RAM
BANK 0
BANK 1
64K 1-2 OP OP 2-3 8K x 8 8K x 8 8K x 8
256K(B)
2-3 CL CL 2-3 16K x 8
32K x 8
32K x 8
CPU clock
JP7
>
33 MHz
CL
CPU clock
JP9 JP21
JP22
JP23
JP24
33 MHz
1-2 OP CL CL OP
CPU clock
JP22
JP23
33 MHz
CL CL
50 MHz
CL OP
Wait
state
JP8
1 ws
CL
(AV-9107)
25 MHz 1-2 OP CL OP CL
40 MHz 1-2 OP OP OP CL
(SC468)
25 MHz OP OP
40 MHz OP CL
Chapter 2.2: Cache configuration
This motherboard can be equipped with up to 256KB of cache memory using the following
settings:
size
128K 1-2 CL OP 1-2 8K x 8 32K x 8 x
256K(A) 1-2 CL CL 2-3 32K x 8 32K x 8 32K x 8
JP34 JP35 JP36 JP38
(U20)
Chapter 2.3: VL BUS configuration
<=33 MHz OP
0 ws OP
Chapter 2.4: Memory configuration
This motherboard can be equipped with both 30-pin SIMM memory modules, as well as Fast
Page 72-pin SIMM memory modules. It has a total of four memory banks (the four 30-pin SIMM
slots are considered as a bank).
RAM size
SIM 1->4 (30p)
SIM 5 (72p)
SIM
6 (72p)
SIM
7 (72p)
JP18
2MB 256
K x 4
pcs 1M x 1pcs
x x 1-2
2MB x 2M x 1pcs x x 2-3
4MB
1M
x 4
pcs X x x 1-2
4MB x 2M x 1pcs
2M x 1pcs
x 2-3
6MB
256
K x 4pcs
1M x 1pcs
4M x 1pcs
x 1-2
6MB x 2M x 1pcs
4M x 1pcs
x 2-3
8MB x 8M x 1pcs
x x 2-3
8MB x 4M x 1pcs
4M x 1pcs
x 2-3
10MB
256
K x 4pcs
1M x 1pcs
4M x 1pcs
4M x 1pcs
1-2
12MB
1M
x 4pcs
x 8M x 1pcs
x 1-2
12MB
1M
x 4pcs
x 4M x 1pcs
4M x 1pcs
1-2 16MB 4M x 4pcs
x x x 1-2
16MB
1M
x 4pcs
4M x 1pcs
4M x 1pcs
4M x 1pcs
1-2
20MB
1M
x 4pcs
16MB x 1pcs
x x 1-2
20MB x 4MB x 1pcs
16MB x 1pcs
x 2-3
32MB 4M
x 4pcs
16MB x 1pcs
x x 1-2
32MB 4M
x 4pcs
x
16MB x 1pcs
x 1-2
32MB x
16MB x 1pcs
16MB x 1pcs
x 2-3
64MB x 64
MB x 1pcs
x x 2-3
128MB 16M x 4pcs
64
MB x 1pcs
x x 1-2
128MB 16M x 4pcs
x 64
MB x 1pcs
x 1-2
128MB x 64
MB x 1pcs
64
MB x 1pcs
x 2-3
4MB x 4M x 1pcs x x 2-3
4MB 256K x 4pcs 1M x 1pcs 1M x 1pcs 1M x 1pcs 1-2
5MB 256K x 4pcs 4M x 1pcs x x 1-2
8MB 1M x 4pcs 4M x 1pcs x x 1-2
10MB 256K x 4pcs 1M x 1pcs 8M x 1pcs x 1-2
10MB x 2M x 1pcs 8M x 1pcs x 2-3
10MB x 2M x 1pcs 4M x 1pcs 4M x 1pcs 2-3
12MB x 4M x 1pcs 4M x 1pcs 4M x 1pcs 2-3
16MB x 16MB x 1pcs x x 2-3
16MB x 8MB x 1pcs 8MB x 1pcs x 2-3
17MB 256K x 4pcs 16MB x 1pcs x x 1-2
20MB 1M x 4pcs x 16MB x 1pcs x 1-2
32MB x 32MB x 1pcs x x 2-3
64MB 16M x 4pcs x x x 1-2
64MB 4M x 4pcs 16MB x 1pcs 16MB x 1pcs 16MB x 1pcs 1-2
64MB x 32MB x 1pcs 32MB x 1pcs x 2-3
128MB x 128MB x 1pcs x x 2-3
Chapter 2.5: Other features
Normal opera
tion 2-3
CMOS clear jumper:
CMOS state JP15
Clear 1-2
GREEN PC hotkey connector: JP16
Attach a power saving switch (hotkey) to this connector. When the hotkey is pressed, the
system goes immediately into power saving mode. Press the hotkey again and the system
wakes up, returning to normal.
Note: if the system’s Power Saving Mode is set to Disabled, the hotkey button will not work.
GREEN monitor power control connector: JP19
The J-403TG motherboard provides Green Monitor Power ON/OFF control functions. Shutting
the monitor power off as the system goes into power saving mode greatly reduces the amount
of power consumed.
To use the Green monitor power functions:
1. Your system’s PSU must support the Active Low signal, during which the PSU shuts off
the monitor power.
2. Your monitor’s power cord must be plugged into the PSU.
GREEN PC LED connector: JP20
You can attach an LED to this connector, to let you know when the system is in power saving
mode.
When the system’s power saving mode is set to Enabled, the LED connected to JP20 flashes
when the system enters power saving mode, and it shuts off when the system leaves the power
saving mode.
If power saving mode is Disabled, the LED is always OFF when running in Turbo mode and it’s
always ON when in normal mode.
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