COMMODORE BUSINESS MACHINES, INC.
=================================

   286 System (Part #368987-01 Rev B)

   Processor        80286                                         
   Processor Speed  8/10MHz                                       
   Chip Set         Unidentified                                  
   Max. Onboard     16MB                                          
   DRAM             
   Cache            None                                          
   BIOS             Commodore                                     
   Dimensions       254mm x 218mm                                 
   I/O Options      16-bit riser card slot, bus mouse port,       
                    floppy interface, game port, IDE interface,   
                    parallel port, serial ports (2)               
   NPU Options      80287                                         

<gopher://bitreich.org/I/th99/m/C-D/31070-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose         | Location | Purpose            | Location |
   |-----------------+----------+--------------------+----------|
   | 16-bit riser    |   CN1    | Drive power        |   DPWR   |
   | card            |          |                    |          |
   |-----------------+----------+--------------------+----------|
   | Serial port 1   |   CN2    | Floppy drive       |   FDD    |
   |                 |          | interface          |          |
   |-----------------+----------+--------------------+----------|
   | Serial port 2   |   CN3    | Game port          |   GAM    |
   |-----------------+----------+--------------------+----------|
   | Parallel port   |   CN4    | IDE drive          |   IDE    |
   |                 |          | interface          |          |
   |-----------------+----------+--------------------+----------|
   | Bus mouse port  |   CN5    |                    |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Jumper |  Position   |
   |-------------------------------------+--------+-------------|
   |>> | Battery type select internal    |  J10   | pins 2 & 3  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |   | Battery type select external    |  J10   | pins 1 & 2  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |>> | Monitor type select monochrome  |  J12   |   Closed    |
   |---+---------------------------------+--------+-------------|
   |   | Monitor type select color       |  J12   |    Open     |
   |---+---------------------------------+--------+-------------|
   |>> | IDE interface enabled           |  J14   | pins 1 & 2  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |   | IDE interface disabled          |  J14   | pins 2 & 3  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |>> | Floppy drive interface enabled  |  J15   | pins 1 & 2  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |   | Floppy drive interface disabled |  J15   | pins 2 & 3  |
   |   |                                 |        |   closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0   |   Bank 1   |   Bank 2    |   Bank 3   |
   |-------+------------+------------+-------------+------------|
   | 512KB | (4) 44256  |    NONE    |    NONE     |    NONE    |
   |-------+------------+------------+-------------+------------|
   |  1MB  | (4) 44256  | (4) 44256  |    NONE     |    NONE    |
   |-------+------------+------------+-------------+------------|
   | 1.5MB | (4) 44256  | (4) 44256  | (2) 256K x  |    NONE    |
   |       |            |            |      9      |            |
   |-------+------------+------------+-------------+------------|
   |  2MB  | (4) 44256  | (4) 44256  | (2) 256K x  | (2) 256K x |
   |       |            |            |      9      |     9      |
   |-------+------------+------------+-------------+------------|
   |  2MB  | (4) 441000 |    NONE    |    NONE     |    NONE    |
   |-------+------------+------------+-------------+------------|
   |  3MB  | (4) 44256  | (4) 44256  | (2) 1M x 9  |    NONE    |
   |-------+------------+------------+-------------+------------|
   |  4MB  |    NONE    |    NONE    | (2) 1M x 9  | (2) 1M x 9 |
   |-------+------------+------------+-------------+------------|
   |  4MB  | (4) 441000 | (4) 441000 |    NONE     |    NONE    |
   |-------+------------+------------+-------------+------------|
   |  5MB  | (4) 44256  | (4) 44256  | (2) 1M x 9  | (2) 1M x 9 |
   |-------+------------+------------+-------------+------------|
   |  8MB  | (4) 444000 |    NONE    |    NONE     |    NONE    |
   |-------+------------+------------+-------------+------------|
   | 16MB  | (4) 444000 | (4) 444000 |    NONE     |    NONE    |
   |-------+------------+------------+-------------+------------|
   | 16MB  |    NONE    |    NONE    | (2) 4M x 9  | (2) 4M x 9 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |       Size       |         J6         |         J7         |
   |------------------+--------------------+--------------------|
   |      512KB       | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       1MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |      1.5MB       | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       2MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       2MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       3MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       4MB        | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |       4MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       5MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       8MB        | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       16MB       | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       16MB       | pins 1 & 2 closed  | pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SERIAL PORT CONFIGURATION                  |
   |------------------------------------------------------------|
   |   CN1    |   CN2    |    J16     |    J17     |    J18     |
   |----------+----------+------------+------------+------------|
   |   COM1   |   COM2   | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
   |          |          |   closed   |   closed   |   closed   |
   |----------+----------+------------+------------+------------|
   |   COM1   | Disabled | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
   |          |          |   closed   |   closed   |   closed   |
   |----------+----------+------------+------------+------------|
   | Disabled |   COM1   | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
   |          |          |   closed   |   closed   |   closed   |
   |----------+----------+------------+------------+------------|
   |   COM2   |   COM1   | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
   |          |          |   closed   |   closed   |   closed   |
   |----------+----------+------------+------------+------------|
   |   COM2   | Disabled | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
   |          |          |   closed   |   closed   |   closed   |
   |----------+----------+------------+------------+------------|
   | Disabled |   COM2   | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
   |          |          |   closed   |   closed   |   closed   |
   |----------+----------+------------+------------+------------|
   | Disabled | Disabled |    N/A     | pins 2 & 3 | pins 2 & 3 |
   |          |          |            |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                PARALLEL PORT CONFIGURATION                 |
   |------------------------------------------------------------|
   |   LPT    |      J19       |      J20       |      J21      |
   |----------+----------------+----------------+---------------|
   |   LPT1   |   pins 1 & 2   |   pins 2 & 3   |  pins 1 & 2   |
   |          |     closed     |     closed     |    closed     |
   |----------+----------------+----------------+---------------|
   |   LPT2   |   pins 1 & 2   |   pins 1 & 2   |  pins 1 & 2   |
   |          |     closed     |     closed     |    closed     |
   |----------+----------------+----------------+---------------|
   |   LPT3   |   pins 2 & 3   |   pins 1 & 2   |  pins 1 & 2   |
   |          |     closed     |     closed     |    closed     |
   |----------+----------------+----------------+---------------|
   | Disabled |   pins 2 & 3   |   pins 2 & 3   |  pins 2 & 3   |
   |          |     closed     |     closed     |    closed     |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/C-D/31070-2.png>
   . 

   +------------------------------------------------------------+
   |                 VIDEO BOARD CONFIGURATION                  |
   |------------------------------------------------------------|
   |                Function                | Jumper | Position |
   |----------------------------------------+--------+----------|
   |>> | VGA board enabled                  |   J1   |  Closed  |
   |---+------------------------------------+--------+----------|
   |   | VGA board disabled (VESA enabled)  |   J1   |   Open   |
   |---+------------------------------------+--------+----------|
   |>> | VGA 1024 x 768 mode disabled       |   J2   |   Open   |
   |---+------------------------------------+--------+----------|
   |   | VGA 1024 x 768 mode enabled        |   J2   |  Closed  |
   |---+------------------------------------+--------+----------|
   |>> | Monitor type select color          |   J3   |   Open   |
   |---+------------------------------------+--------+----------|
   |   | Monitor type select monochrome     |   J3   |  Closed  |
   +------------------------------------------------------------+