JOINDATA SYSTEMS, INC.
======================

   G486PEL

   Processor             80486SX/80487SX/80486DX/80486DX2         
   Processor Speed       20/25/33/50(internal)/50/66(internal)MHz 
   Chip Set              OPTI                                     
   Max. Onboard DRAM     128MB                                    
   Cache                 64/128/256KB                             
   BIOS                  AMI                                      
   Dimensions            330mm x 218mm                            
   I/O Options           32-bit local bus card slots (2)          
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/I-L/31126-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose               | Location | Purpose      | Location |
   |-----------------------+----------+--------------+----------|
   | 32-bit local bus card |   COM1   | Turbo switch |   J11    |
   |-----------------------+----------+--------------+----------|
   | 32-bit local bus card |   COM2   | Speaker      |   J12    |
   |-----------------------+----------+--------------+----------|
   | Reset switch          |    J9    | Power LED &  |   J13    |
   |                       |          | keylock      |          |
   |-----------------------+----------+--------------+----------|
   | Turbo LED             |   J10    |              |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select monochrome   |  JP1   |    Open    |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select color        |  JP1   |   Closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP2   | pins 2 & 3 |
   |   | alter                            |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       64MB       |    (4) 16M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |      128MB       |    (4) 16M x 9     |    (4) 16M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size  |  Bank 0  | Bank 1  |  TAG   | TAG(U42) |  Dirty   |
   |        |          |         | (U39)  |          | Bit(U43) |
   |--------+----------+---------+--------+----------+----------|
   |  64KB  | (4) 8K x | (4) 8K  | (1) 8K | (1) 16K  | (1) 16K  |
   |        |    8     |   x 8   |  x 8   |   x 4    |   x 4    |
   |--------+----------+---------+--------+----------+----------|
   | 128KB  | (4) 32K  |  NONE   | (1) 8K | (1) 16K  | (1) 16K  |
   |        |   x 8    |         |  x 8   |   x 4    |   x 4    |
   |--------+----------+---------+--------+----------+----------|
   | 256KB  | (4) 32K  | (4) 32K | (1) 8K | (1) 16K  | (1) 16K  |
   |        |   x 8    |   x 8   |  x 8   |   x 4    |   x 4    |
   |------------------------------------------------------------|
   | Note:256KB configuration requires the addition of (1) 8K x |
   | 8 tag chip at (U38).                                       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |  JP4   |  JP5   |  JP6   |  JP7   |      JP8       |
   |-------+--------+--------+--------+--------+----------------|
   | 64KB  |  Open  |  Open  |  Open  |  Open  |   pins 2 & 3   |
   |       |        |        |        |        |     closed     |
   |-------+--------+--------+--------+--------+----------------|
   | 128KB |  Open  | Closed |  Open  | Closed |   pins 1 & 2   |
   |       |        |        |        |        |     closed     |
   |-------+--------+--------+--------+--------+----------------|
   | 256KB | Closed | Closed | Closed | Closed |   pins 2 & 3   |
   |       |        |        |        |        |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |    Type    |        JP15        |           JP17           |
   |------------+--------------------+--------------------------|
   |  80486SX   | pins 1 & 2 closed  | pins 1 & 2, 3 & 4 closed |
   |------------+--------------------+--------------------------|
   |  80487SX   | pins 2 & 3 closed  | pins 1 & 2, 3 & 4 closed |
   |------------+--------------------+--------------------------|
   |  80486DX   |        Open        |    pins 2 & 3 closed     |
   |------------+--------------------+--------------------------|
   |  80486DX2  |        Open        |    pins 2 & 3 closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |    Speed     | JP9 | JP12  | JP11 | JP13 |  JP14  |  JP16  |
   |--------------+-----+-------+------+------+--------+--------|
   |  80486SX-20  | 2 & | 2 & 3 | 1 &  | 2 &  |  Open  |  Open  |
   |              |  3  |       |  2   |  3   |        |        |
   |--------------+-----+-------+------+------+--------+--------|
   |  80486SX-25  | 1 & | 1 & 2 | 1 &  | 2 &  |  Open  |  Open  |
   |              |  2  |       |  2   |  3   |        |        |
   |--------------+-----+-------+------+------+--------+--------|
   |  80486DX-25  | 1 & | 1 & 2 | 1 &  | 2 &  |  Open  |  Open  |
   |              |  2  |       |  2   |  3   |        |        |
   |--------------+-----+-------+------+------+--------+--------|
   |  80486DX-33  | 1 & | 1 & 2 | 2 &  | 2 &  |  Open  | Closed |
   |              |  2  |       |  3   |  3   |        |        |
   |--------------+-----+-------+------+------+--------+--------|
   |  80486DX-50  | 1 & | 1 & 2 | 1 &  | 1 &  | Closed | Closed |
   |              |  2  |       |  2   |  2   |        |        |
   |--------------+-----+-------+------+------+--------+--------|
   | 80486DX2-50  | 1 & | 1 & 2 | 1 &  | 2 &  |  Open  |  Open  |
   |              |  2  |       |  2   |  3   |        |        |
   |------------------------------------------------------------|
   | Note: Oscillator speed remains synchronous with the CPU,   |
   | except when using an 80486DX2-50, the oscillator should be |
   | 25MHz. Pins designated should be in the closed position.   |
   +------------------------------------------------------------+