MNC INTERNATIONAL, INC.
=======================

   MNC 1144 COMPLETE 486SBC (Rev. 2.10)

   Processor         80486SX/80487SX/80486DX/8486DX2              
   Processor Speed   25/33/50(internal)/50/66(internal)           
   Chip Set          VSLI                                         
   Max. Onboard DRAM 32MB                                         
   Cache             None                                         
   BIOS              Phoenix                                      
   Dimensions        333mm x 107mm                                
   I/O Options       Floppy drive interface, IDE interface,       
                     parallel port, serial port (2), VGA port     
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/31356-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | IDE interface LED   |    J1    | Serial port 2  |    P4    |
   |---------------------+----------+----------------+----------|
   | Turbo LED           |    J5    | Front panel    |    P5    |
   |                     |          | switches       |          |
   |---------------------+----------+----------------+----------|
   | IDE interface       |    P1    | LCD screen     |    P6    |
   |---------------------+----------+----------------+----------|
   | Floppy drive        |    P2    | VGA port       |    P7    |
   | interface           |          |                |          |
   |---------------------+----------+----------------+----------|
   | Serial port 1       |    P3    | Parallel port  |    P8    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       5MB        |    (4) 256K x 9    |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Jumper  |  Position  |
   |-------------------------------------+---------+------------|
   |>> | IDE interface enabled           |   J2    | pins 2 & 3 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | IDE interface disabled          |   J2    | pins 1 & 2 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |>> | Floppy drive interface select   |   J3A   | pins 2 & 3 |
   |   | normal operation                |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Floppy drive interface select   |   J3A   | pins 1 & 2 |
   |   | encoded                         |         |   closed   |
   |---+---------------------------------+---------+------------|
   |>> | Floppy drive interface enabled  |   J3B   | pins 2 & 3 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Floppy drive interface disabled |   J3B   | pins 1 & 2 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |>> | J3 Jumper settings enabled      |   J3H   | pins 2 & 3 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | J3 Jumper settings disabled     |   J3H   | pins 1 & 2 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Watchdog Timer interval select  |   J4    | pins 1 & 2 |
   |   | 1.2 second                      |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Watchdog Timer interval select  |   J4    | pins 2 & 3 |
   |   | 150ms                           |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Watchdog Timer interval select  |   J4    |    open    |
   |   | 600ms                           |         |            |
   |---+---------------------------------+---------+------------|
   |>> | Watchdog Timer enabled          |   J4A   | pins 1 & 2 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Watchdog Timer disabled         |   J4A   | pins 2 & 3 |
   |   |                                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |>> | Monitor type select color       |   J7    |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Monitor type select monochrome  |   J7    |    open    |
   |---+---------------------------------+---------+------------|
   |   | Paralell port select            |   J9    | pins 2 & 3 |
   |   | Uni-directional                 |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Paralell port select            |   J9    | pins 1 & 2 |
   |   | Bi-directional                  |         |   closed   |
   |---+---------------------------------+---------+------------|
   |>> | Bus cycle lock enabled          |   J14   |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Bus cycle lock disabled         |   J14   |    open    |
   |---+---------------------------------+---------+------------|
   |>> | Burst mode enabled              |   J17   |   closed   |
   |---+---------------------------------+---------+------------|
   |   | Burst mode disabled             |   J17   |    open    |
   |---+---------------------------------+---------+------------|
   |>> | Secondary cache disabled        |   J18   |    open    |
   |---+---------------------------------+---------+------------|
   |   | Secondary cache enabled         |   J18   |   closed   |
   |---+---------------------------------+---------+------------|
   |>> | VGA port interrupt request      |   J20   | pins 1 & 2 |
   |   | select none                     |         |   closed   |
   |---+---------------------------------+---------+------------|
   |   | VGA port interrupt request      |   J20   | pins 2 & 3 |
   |   | select IR/FONT>                 |         |   closed   |
   |------------------------------------------------------------|
   | Note:To disable Watchdog Timer (J4A) you must cut the      |
   | trace between pins 1 & 2 on back of board.                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SERIAL PORT CONFIGURATION                  |
   |------------------------------------------------------------|
   | Serial port 1 |  Serial   |   J3C    |   J3D    |   J3E    |
   |               |  port 2   |          |          |          |
   |---------------+-----------+----------+----------+----------|
   |     COM1      |   COM2    | pins 2 & | pins 2 & | pins 2 & |
   |               |           |    3     |    3     |    3     |
   |---------------+-----------+----------+----------+----------|
   |     COM1      | Disabled  | pins 2 & | pins 1 & | pins 2 & |
   |               |           |    3     |    2     |    3     |
   |---------------+-----------+----------+----------+----------|
   |     COM2      | Disabled  | pins 1 & | pins 1 & | pins 2 & |
   |               |           |    2     |    2     |    3     |
   |---------------+-----------+----------+----------+----------|
   |     COM2      |   COM1    | pins 1 & | pins 2 & | pins 2 & |
   |               |           |    2     |    3     |    3     |
   |---------------+-----------+----------+----------+----------|
   |   Disabled    |   COM1    | pins 1 & | pins 2 & | pins 1 & |
   |               |           |    2     |    3     |    2     |
   |---------------+-----------+----------+----------+----------|
   |   Disabled    |   COM2    | pins 2 & | pins 2 & | pins 1 & |
   |               |           |    3     |    3     |    2     |
   |---------------+-----------+----------+----------+----------|
   |   Disabled    | Disabled  | pins 1 & | pins 1 & | pins 1 & |
   |               |           |    2     |    2     |    2     |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                PARALLEL PORT CONFIGURATION                 |
   |------------------------------------------------------------|
   |             Function             |    J3F     |    J3G     |
   |----------------------------------+------------+------------|
   |>> | Parallel port (P8) select    | pins 2 & 3 | pins 2 & 3 |
   |   | LPT1 at 378h                 |   closed   |   closed   |
   |---+------------------------------+------------+------------|
   |   | Parallel port (P8) select    | pins 1 & 2 | pins 2 & 3 |
   |   | LPT2 at 278h                 |   closed   |   closed   |
   |---+------------------------------+------------+------------|
   |   | Parallel port (P8) select    | pins 2 & 3 | pins 1 & 2 |
   |   | LPT3 at 3BCh                 |   closed   |   closed   |
   |---+------------------------------+------------+------------|
   |   | Parallel port (P8) disabled  | pins 1 & 2 | pins 1 & 2 |
   |   |                              |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               LCD DISPLAY TYPE CONFIGURATION               |
   |------------------------------------------------------------|
   |            Type            |              J8               |
   |----------------------------+-------------------------------|
   |             0              |             open              |
   |----------------------------+-------------------------------|
   |             1              |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |             2              |       pins 3 & 4 closed       |
   |----------------------------+-------------------------------|
   |             3              |  pins 1 & 2 and 3 & 4 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             FLASH MEMORY ADDRESS CONFIGURATION             |
   |------------------------------------------------------------|
   |          Address           |              J19              |
   |----------------------------+-------------------------------|
   |       C0000 - C7FFF        |             open              |
   |----------------------------+-------------------------------|
   |       C8000 - CFFFF        |       pins 3 & 4 closed       |
   |----------------------------+-------------------------------|
   |       D0000 - D7FFF        |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |       D8000 - DFFFF        |  pins 1 & 2 and 3 & 4 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type   |             J12             |        J13        |
   |----------+-----------------------------+-------------------|
   | 80486DX2 | pins 1 & 2 and 3 & 4 closed | pins 3 & 4 closed |
   |----------+-----------------------------+-------------------|
   | 80846DX  | pins 1 & 2 and 3 & 4 closed | pins 3 & 4 closed |
   |----------+-----------------------------+-------------------|
   | 80487SX  | pins 1 & 2 and 3 & 4 closed | pins 1 & 2 closed |
   |----------+-----------------------------+-------------------|
   | 80486SX  |      pins 2 & 3 closed      | pins 2 & 3 closed |
   +------------------------------------------------------------+