The Retro Web B51-80 Laptop Motherboard User Manual
- October 30, 2023
- The Retro Web
Table of Contents
The Retro Web B51-80 Laptop Motherboard
Product Information
B51 Main Board
The B51 Main Board is a type of motherboard used in Net PC Series. It comes with a user manual that describes the jumper settings for the board. The board supports 32MB SDRAM as the basic system memory configuration, and it can be expanded up to 144-pin S.O. DIMM socket (CN18). Additionally, it supports 4MB VGA share memory (UMA).
Jumpers Location Diagram for B51 V1.X Main Board
The jumpers location diagram for the B51 V1.X main board is as follows:
Memory Configuration for B51 V1.X Main Board
The basic system memory configuration for the B51 V1.X main
board is 32MB SDRAM at jumper location U31, U32, U33, and U34. To
expand the memory, a 144-pin S.O. DIMM socket (CN18) is provided.
It is important to use the same type of SDRAM for expansion.
Jumper Setting
The following jumper settings are available:
-
* CPU Type Selection: JP1
| CPU | 200MHz | 233MHz | 266MHz | 300MHz |
|---|---|---|---|---|
| 1-2 | Open | Close | Open | Close |
| 3-4 | Close | Open | Open | Open |
| 5-6 | Open | Open | Open | Close |
-
* CMOS Data Clean: J1
| CMOS data | J1 |
|---|---|
| Clean | 2-3 |
| Normal (default) | 1-2 |
-
* Reset Switch: JP21
| Mode | Reset | Normal mode (default) |
|---|---|---|
| JP21 | Close | Open |
Product Usage Instructions
B51 Main Board
To use the B51 Main Board, follow these steps:
- Refer to the user manual for detailed technical information.
- Set the jumper settings according to your requirements. Refer to the “Jumper Setting” section for details.
- Install the board in your PC system unit.
- For memory expansion, use the 144-pin S.O. DIMM socket (CN18) and make sure to use the same type of SDRAM.
- To reset CMOS data, move the power connector away from the PC system after power off if ATX type power supply is used. Otherwise, the 5VSB (standby voltage) still exists, and RTC will not be cleaned without removing the power connector.
INDEX
This user’s manual describes the jumper setting of B51 Main Board. For
detailed technical information, please refer to CDs attached with PC system
unit.
All other registered and unregistered trademarks are trademarks of their
respective holders
Jumpers Location Diagram for “B51 V1.X ” main board
Memory configuration for “B51 V1.X” main board
- The basic system memory configuration of this Net PC Series is 32MB SDRAM at jumper location U31, U32, U33 and U34.
- It supports 4MB VGA share memory (UMA). It is optional for memory expansion by a 144-pin S.O. DIMM socket (CN18).
- To use same type of SDRAM for expansion is important.
Jumper Setting
CPU type selection : JP1
| CPU | 1-2 | 3-4 | 5-6 |
|---|---|---|---|
| Gxm 200MHz | Open | Close | Open |
| Gxm 233MHz | Close | Open | Open |
| Gxm 266MHz | Open | Open | Open |
| Gxm 300MHz | Close | Open | Close |
CMOS Data Clean: J1
| CMOS data | J1 |
|---|---|
| Clean | 2-3 |
| Normal (default) | 1-2 |
IMPORTANT!
- To reset CMOS data, please move the power connector away from the PC system after powering off if an ATX-type power supply is used. Otherwise, the 5VSB (stand-by voltage ) still exists and RTC will not be cleaned without removing the power connector.
Reset Switch: JP21
| Mode | JP21 |
|---|---|
| Reset | Close |
| Normal mode (default) | Open |
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