( Data from M912 manual )
Mainboard Component Location
Mainboard Component Location
 |
CPU Type Jumpers
Set jumpers JP27 to JP30, JP32, and JP33 so that the
mainboard recognizes the type of CPU installed. Set
CPU type as below.
Note: A wrong setting may cause the system to hang up.
CPU Type Jumpers
 |
JP6 to JP8 CPU Clock Setting
CPU Clock Setting
| CPU Clock |
JP6 |
JP7 |
JP8 |
| 25 MHz |
OFF |
OFF |
ON |
| 33 MHz |
ON |
ON |
ON |
| 40 MHz |
OFF |
ON |
ON |
| 50 MHz |
ON |
OFF |
OFF |
JP31 - Intel 80486DX4 CPU Clock Multiplier Jumper
Clock Multiplier
| Clock Multiplier |
JP31 |
| 2 X |
OFF |
| 2.5 X |
1-2 |
| 2 X |
2-3 |
JP34 - AMD 80486DX4 CPU Clock Multiplier Jumper
Clock Multiplier
| Clock Multiplier |
JP34 |
| 3 X |
OFF |
| 2 X |
ON |
JP21 to JP24, JP35 - CPU Power Selectors
CPU Power Selectors
| CPU Power |
JP24 |
JP25 |
JP26 |
JP35 |
| 5 Volts |
2-3 |
2-3 |
2-3 |
OFF |
| 3.3 Volts |
1-2 |
1-2 |
1-2 |
ON |
| 4 Volts |
1-2 |
1-2 |
1-2 |
OFF |
JP16 - VESA Clock Selector
When the CPU clock is less than or equal to 33 MHz
take the jumper OFF of JP16. When the CPU clock is
greater than 33 MHz put a jumper ON JP16.
VESA Clock Selector
| Description |
JP16 |
| <= 33 MHz |
OFF |
| > 33MHz |
ON |
JP17 - VESA Wait State
JP17 sets the VESA wait state.
VESA wait state
| Description |
JP17 |
| 0 WS |
OFF |
| 1 WS |
ON |
J1 Keyboard Connector
A standard five-pin female DIN keyboard connector is located at the rear of the board J1.
Keyboard Connector
| Pin |
Description |
| 1 |
Keyboard Clock |
| 2 |
Keyboard Data |
| 3 |
N.C. |
| 4 |
Ground |
| 5 |
+ 5VDC |
J9 Power Supply Connector
The power supply connectors are two six-pin male header connectors. Plug the dual connectors from the power directly onto the board connectors.
Most of power supply have two leads. Each lead has six wires. Two of which are black, orient the connectors, so the black wires are in the middle.
Power Supply Connectors
| Pin |
Description |
Pin |
Description |
| 1 |
Power Good |
7 |
Ground |
| 2 |
+ 5V DC |
8 |
Ground |
| 3 |
+ 12V DC |
9 |
- 5V DC |
| 4 |
- 12V DC |
10 |
+ 5V DC |
| 5 |
Ground |
11 |
+ 5 V DC |
| 6 |
Ground |
12 |
+ 5V DC |
J18 Speaker Connector
Attach the system speaker to connector J18.
Speaker Connector
| Pin |
Description |
| 1 |
Data Out |
| 2 |
Not Used |
| 3 |
Ground |
| 4 |
+ 5V |
J1 Internal / External Battery Selectors
Battery Selectors
| Description |
J1 |
| External Battery |
Pin 1 and pin 4
to connect external battery |
| Internal Battery |
Pin 2-3 short |
| Clear CMOS |
Pin 3-4 short |
JP15 Keylock & Power LED Connector
JP15 is a keylock connector that enables and disables the keyboard and the Power-LED on the case.
Keylock & Power LED Connector
| Pin |
Description |
| 1 |
LED Output |
| 2 |
Not Used |
| 3 |
Ground |
| 4 |
Keyboard Inhibiter |
| 5 |
Ground |
J19 Turbo LED Connector
JP19 is usually connected to a Turbo LED on front of
the system case. If the system board select is in Turbo
mode, the indicator lights during high-speed operation.
Turbo LED Connector
| Pin |
Description |
| 1 |
Anode(+) |
| 2 |
Cathode(-), Ground |
JP20 Reset Switch Connector
Attach the Reset switch cable to this connector.
Reset Connector
| Setting |
Description |
| Open |
Normal Mode |
| Short |
Reset System |
JP22 Turbo Switch Connector
JP22 connects to the Turbo switch, which is used to
select the mainboard's clock speed.
Turbo Switch Connector
| Setting |
Description |
| Short |
Low speed Mode |
| Open |
Turbo Mode |
JP23 Suspend Switch Connector
A push button attached to this connector lets you force
the system to enter suspend mode.
Suspend Connector
| Setting |
Description |
| Default |
Normal Mode |
| Toggle |
Force system to enter Suspend mode |
