WESTERN DIGITAL CORPORATION
===========================

   WD286-WDM2

   Processor        80286                                         
   Processor Speed  12.5MHz                                       
   Chip Set         Faraday                                       
   Max. Onboard     16MB                                          
   DRAM             
   Cache            None                                          
   BIOS             AMI                                           
   Dimensions       330mm x 218mm                                 
   I/O Options      Parallel port, serial porst (2), PS/2 mouse   
                    port, floppy drive interface, ST506/412       
                    interface, video interface, IDE interface     
   NPU Options      80287                                         

<gopher://bitreich.org/I/th99/m/U-Z/30152-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | IDE interface     |    J5    | Floppy drive     |   J16    |
   | (optional)        |          | interface        |          |
   |-------------------+----------+------------------+----------|
   | Hard drive access |   J10    | ST506/412 drive  |   J17    |
   | LED               |          | control          |          |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   J11    | Serial port 1    |   J19    |
   |-------------------+----------+------------------+----------|
   | ST506/412 data    |   J12    | Serial port 2    |   J20    |
   | (Drive 0)         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | ST506/412 data    |   J13    | Video interface  |   J21    |
   | (Drive 1)         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J14    | PS/2 mouse port  |   J22    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   J15    | Speaker          |   J24    |
   | (LPT1)            |          |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Factory configured - do not      |   W2   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |   W4   |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |   W6   |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |   W7   | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Floppy drive IRQ6 enabled        |   W8   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Floppy drive IRQ6 disabled       |   W8   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |   W9   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Keyboard configuration XT        |  W12   |   Closed   |
   |   | compatible                       |        |            |
   |---+----------------------------------+--------+------------|
   |   | Keyboard configuration AT        |  W12   |    Open    |
   |   | compatible                       |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Video IRQ9 enabled               |  W13   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Video IRQ9 disabled              |  W13   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  W14   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  W15   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  W16   |    N/A     |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Mouse IRQ12 enabled              |  W17   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Mouse IRQ12 disabled             |  W17   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | LPT1 (J15) IRQ7 enabled          |  W19   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | LPT1 (J15) IRQ7 disabled         |  W19   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | COM2 (J20) IRQ3 enabled          |  W20   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | COM2 (J20) IRQ3 disabled         |  W20   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | COM1 (J19) IRQ4 enabled          |  W21   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | COM1 (J19) IRQ4 disabled         |  W21   |    Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       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        |
   |------------------+--------------------+--------------------|
   |       10MB       |     (2) 1M x 9     |     (2) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (2) 4M x 9     |     (2) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 VIDEO JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |                    Internal video only                     |
   |------------------------------------------------------------|
   |Monitor type     |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |  W18  |
   |-----------------+------+------+------+------+------+-------|
   |Monochrome       | Off  | Off  |  On  | Off  | Off  |Closed |
   |-----------------+------+------+------+------+------+-------|
   |CGA-40 columns   |  On  | Off  | Off  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |CGA-80 columns   | Off  | Off  | Off  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |EGA-200 lines    |  On  |  On  |  On  | Off  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |EGA-350/480 lines| Off  |  On  |  On  | Off  | Off  | Open  |
   |------------------------------------------------------------|
   |     Internal video as primary-color/External video as      |
   |                    secondary-monochrome                    |
   |------------------------------------------------------------|
   |Color monitor    |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |  W18  |
   |type             |      |      |      |      |      |       |
   |-----------------+------+------+------+------+------+-------|
   |CGA-40 columns   |  On  | Off  | Off  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |CGA-80 columns   | Off  | Off  | Off  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |EGA-200 lines    |  On  |  On  |  On  | Off  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |EGA-350/480 lines| Off  |  On  |  On  | Off  | Off  | Open  |
   |------------------------------------------------------------|
   |    Internal video as secondary-color/External video as     |
   |                     primary-monochrome                     |
   |------------------------------------------------------------|
   |Color monitor    |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |  W18  |
   |type             |      |      |      |      |      |       |
   |-----------------+------+------+------+------+------+-------|
   |CGA-40 columns   |  On  |  On  |  On  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |CGA-80 columns   | Off  |  On  |  On  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |EGA-200 lines    |  On  | Off  |  On  |  On  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |EGA-350/480 lines| Off  | Off  |  On  |  On  | Off  | Open  |
   |------------------------------------------------------------|
   |   Internal video as primary-monochrome/External video as   |
   |                      secondary-color                       |
   |------------------------------------------------------------|
   |Color monitor    |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |  W18  |
   |type             |      |      |      |      |      |       |
   |-----------------+------+------+------+------+------+-------|
   |CGA-40 columns   |  On  | Off  |  On  | Off  | Off  | Open  |
   |-----------------+------+------+------+------+------+-------|
   |CGA-80 columns   | Off  | Off  |  On  | Off  | Off  | Open  |
   |------------------------------------------------------------|
   |  Internal video as secondary-monochrome/External video as  |
   |                       primary-color                        |
   |------------------------------------------------------------|
   |Color monitor    |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |  W18  |
   |type             |      |      |      |      |      |       |
   |-----------------+------+------+------+------+------+-------|
   |CGA-40 columns   |  On  |  On  | Off  |  On  | Off  | open  |
   |-----------------+------+------+------+------+------+-------|
   |CGA-80 columns   | Off  |  On  | Off  |  On  | Off  | open  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  HARD DRIVE CONFIGURATION                  |
   |------------------------------------------------------------|
   | Drive type |  W1   |  W3   |  W5   |  W10  |  W11  |  W22  |
   |------------+-------+-------+-------+-------+-------+-------|
   | ST506/412  |Closed |Closed |Closed | Open  | Open  | Open  |
   |------------+-------+-------+-------+-------+-------+-------|
   |    IDE     | Open  | Open  | Open  |Closed |Closed |Closed |
   |------------+-------+-------+-------+-------+-------+-------|
   |  External  | Open  | Open  | Open  | Open  | Open  | Open  |
   |------------------------------------------------------------|
   |Note:An external hard drive may be used secondary to the    |
   |ST506/412 with the ST506/412 jumper                         |
   |                                                            |
   |settings.                                                   |
   +------------------------------------------------------------+