I-BUS
=====

   LB486SLC

   Processor    CX486SLC                                          
   Processor    33MHz                                             
   Speed        
   Chip Set     OPTI                                              
   Max. Onboard 16MB                                              
   DRAM         
   Cache        128KB                                             
   BIOS         Unidentified                                      
   Dimensions   300mm x 89mm                                      
   I/O Options  Floppy drive interface, IDE interface, parallel   
                port, PS/2 mouse port, serial ports (2), VGA port 
   NPU Options  80387SX                                           

<gopher://bitreich.org/I/th99/m/I-L/33065-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | Speaker             |    J3    | Parallel port  |   J15    |
   |---------------------+----------+----------------+----------|
   | Reset switch        |    J4    | Serial port 1  |   J16    |
   |---------------------+----------+----------------+----------|
   | PS/2 mouse port     |    J6    | Serial port 2  |   J17    |
   |---------------------+----------+----------------+----------|
   | Auxiliary keyboard  |    J7    | IDE interface  |   J18    |
   | connector           |          | LED            |          |
   |---------------------+----------+----------------+----------|
   | Floppy drive        |   J13    | VGA port       |   J22    |
   | interface           |          |                |          |
   |---------------------+----------+----------------+----------|
   | IDE interface       |   J14    |                |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Factory configured - do not      |   J1   |   Closed   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |   J2   |   Closed   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Battery type select internal     |   J8   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |   J8   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | IDE IRQ14 enabled                |  J12   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | IDE IRQ14 disabled               |  J12   |    Open    |
   |---+----------------------------------+--------+------------|
   |   | VGA IRQ9 enabled                 |  J23   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | VGA IRQ9 disabled                |  J23   |    Open    |
   |---+----------------------------------+--------+------------|
   |   | On board video disabled          |  J24   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | On board video enabled           |  J24   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Password enabled                 |  J25   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Password disabled                |  J25   |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |      512KB       |    (2) 256K x 9    |        NONE        |
   |------------------+--------------------+--------------------|
   |       1MB        |    (2) 256K x 9    |    (2) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       2MB        |     (2) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       4MB        |     (2) 1M x 9     |     (2) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (2) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       16MB       |     (2) 4M x 9     |     (2) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Note: 128KB cache is factory installed and is not          |
   | configurable.                                              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              PARALLEL PORT IRQ CONFIGURATION               |
   |------------------------------------------------------------|
   |            IRQ             |              J21              |
   |----------------------------+-------------------------------|
   |            IRQ3            |       pins 3 & 4 closed       |
   |----------------------------+-------------------------------|
   |            IRQ4            |       pins 5 & 6 closed       |
   |----------------------------+-------------------------------|
   |            IRQ5            |       pins 7 & 8 closed       |
   |----------------------------+-------------------------------|
   |            IRQ7            |      pins 9 & 10 closed       |
   |----------------------------+-------------------------------|
   |           IRQ12            |       pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 1 IRQ CONFIGURATION               |
   |------------------------------------------------------------|
   |            IRQ             |              J20              |
   |----------------------------+-------------------------------|
   |            IRQ3            |       pins 3 & 4 closed       |
   |----------------------------+-------------------------------|
   |            IRQ4            |       pins 5 & 6 closed       |
   |----------------------------+-------------------------------|
   |            IRQ5            |       pins 7 & 8 closed       |
   |----------------------------+-------------------------------|
   |            IRQ7            |      pins 9 & 10 closed       |
   |----------------------------+-------------------------------|
   |           IRQ12            |       pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 2 IRQ CONFIGURATION               |
   |------------------------------------------------------------|
   |            IRQ             |              J19              |
   |----------------------------+-------------------------------|
   |            IRQ3            |       pins 3 & 4 closed       |
   |----------------------------+-------------------------------|
   |            IRQ4            |       pins 5 & 6 closed       |
   |----------------------------+-------------------------------|
   |            IRQ5            |       pins 7 & 8 closed       |
   |----------------------------+-------------------------------|
   |            IRQ7            |      pins 9 & 10 closed       |
   |----------------------------+-------------------------------|
   |           IRQ12            |       pins 1 & 2 closed       |
   +------------------------------------------------------------+