GIGA-BYTE TECHNOLOGY CO., LTD
=============================

   GA-386UM 33/40 MAIN BOARD

   Processor             80386DX                                  
   Processor Speed       33/40MHz                                 
   Chip Set              OPTI                                     
   Max. Onboard DRAM     32MB                                     
   SRAM Cache            64/128/256KB                             
   BIOS                  AMI                                      
   Dimensions            220mm x 260mm                            
   I/O Options           None                                     
   NPU Options           80387/3167                               

<gopher://bitreich.org/I/th99/m/E-H/31078-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location  | Purpose            | Location |
   |----------------+-----------+--------------------+----------|
   | Power LED &    |    J1     | Turbo switch       |    J4    |
   | keylock        |           |                    |          |
   |----------------+-----------+--------------------+----------|
   | Speaker        |    J2     | Turbo LED          |    J5    |
   |----------------+-----------+--------------------+----------|
   | Reset switch   |    J3     | External battery   |   J11    |
   |------------------------------------------------------------|
   | Note:Board may be supplied with either a PGA (socketed) or |
   | PQFP (surface mounted) CPU.                                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | NPU absent                     |   J7   |     open     |
   |---+--------------------------------+--------+--------------|
   |   | NPU present                    |   J7   |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Monitor type select color      |   J8   |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |   J8   |     open     |
   |---+--------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |   J9   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |   J9   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (4) 256K x 9    |        NONE        |
   |------------------+--------------------+--------------------|
   |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |  Cache SRAM   |   Location    |      TAG      |
   |------------+---------------+---------------+---------------|
   |    64KB    |  (8) 8K x 8   |  Banks 0 & 1  |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |    Bank 0     |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (8) 32K x 8  |  Banks 0 & 1  |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   | Size  |    WC1    |  WC2   |  WC3   |    WC4    |   WC5    |
   |-------+-----------+--------+--------+-----------+----------|
   | 64KB  | pins 2 &  |  open  |  open  | pins 1 &  | pins 1 & |
   |       | 3 closed  |        |        | 2 closed  | 2 closed |
   |-------+-----------+--------+--------+-----------+----------|
   | 128KB | pins 1 &  |  open  | closed | pins 2 &  | pins 1 & |
   |       | 2 closed  |        |        | 3 closed  | 2 closed |
   |-------+-----------+--------+--------+-----------+----------|
   | 256KB | pins 2 &  | closed | closed | pins 2 &  | pins 2 & |
   |       | 3 closed  |        |        | 3 closed  | 3 closed |
   +------------------------------------------------------------+