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

   G486PE

   Processor          80486SX/80486DX/80486DX2                    
   Processor Speed    20/25/33/40/50(internal)/50/66(internal)MHz 
   Chip Set           OPTI                                        
   Max. Onboard DRAM  32MB                                        
   Cache              64/128/256/512KB                            
   BIOS               AMI                                         
   Dimensions         330mm x 218mm                               
   I/O Options        None                                        
   NPU Options        4167                                        

<gopher://bitreich.org/I/th99/m/I-L/31127-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | Speaker             |    J4    | Reset switch   |    J9    |
   |---------------------+----------+----------------+----------|
   | Power LED & keylock |    J5    |                |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper  | Position  |
   |--------------------------------------+---------+-----------|
   |>> | I/O bus speed select normal      |   JP1   |   Open    |
   |---+----------------------------------+---------+-----------|
   |   | I/O bus speed select slow        |   JP1   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |>> | Monitor type select monochrome   |   JP5   |   Open    |
   |---+----------------------------------+---------+-----------|
   |   | Monitor type select color        |   JP5   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |>> | Burst mode enabled               |   JP7   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Burst mode disabled              |   JP7   |   Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  | Bank 0  | Bank 1  |   TAG    |   TAG    |  Dirty   |
   |       |         |         |  (U52)   |  (U52)   | Bit(U66) |
   |-------+---------+---------+----------+----------+----------|
   | 64KB  | 4) 8K x | 4) 8K x | (1) 8K x |   N/A    | (1) 16K  |
   |       |    8    |    8    |    8     |          |   x 1    |
   |-------+---------+---------+----------+----------+----------|
   | 128KB | (4) 32K |  NONE   | (1) 8K x |   N/A    | (1) 16K  |
   |       |   x 8   |         |    8     |          |   x 1    |
   |-------+---------+---------+----------+----------+----------|
   | 256KB | (4) 32K | (4) 32K | (1) 8K x | (1) 8K x | (1) 16K  |
   |       |   x 8   |   x 8   |    8     |    8     |   x 1    |
   |-------+---------+---------+----------+----------+----------|
   | 512KB |   (4)   |  NONE   | (1) 32K  |   N/A    | (1) 64K  |
   |       | 128K x  |         |   x 8    |          |   x 1    |
   |       |    8    |         |          |          |          |
   |------------------------------------------------------------|
   | Note:You may use a (1) 64K x 1 at U66 for all Cache SRAM   |
   | sizes .                                                    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  | JP6  | JP11  | JP12  | JP13  | JP14  | JP15 | JP16 |
   |-------+------+-------+-------+-------+-------+------+------|
   | 64KB  |2 & 3 | Open  | Open  | Open  | Open  | Open | Open |
   |-------+------+-------+-------+-------+-------+------+------|
   | 128KB |1 & 2 | Open  | Open  |Closed | Open  |Closed| Open |
   |-------+------+-------+-------+-------+-------+------+------|
   | 256KB |2 & 3 | Open  |Closed |Closed |Closed |Closed| Open |
   |-------+------+-------+-------+-------+-------+------+------|
   | 512KB |1 & 2 |Closed |Closed |Closed |Closed |Closed|Closed|
   |------------------------------------------------------------|
   |Note:Pins designated should be in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |    Type    | OSC1  |  JP2   |  JP3   | JP8  | JP9  | JP10  |
   |------------+-------+--------+--------+------+------+-------|
   | 80486DX2-  | 50MHz | Closed | Closed | 1 &  | 2 &  | 1 & 2 |
   |   50 MHz   |       |        |        | 2, 3 |  3   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   | 80486DX2-  | 25MHz | Closed | Closed | 1 &  | 1 &  | 1 & 2 |
   |   50 MHz   |       |        |        | 2, 3 |  2   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486DX-  | 50MHz | Closed | Closed | 1 &  | 1 &  | 1 & 2 |
   |   50 MHz   |       |        |        | 2, 3 |  2   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486DX-  | 66MHz | Closed |  Open  | 1 &  | 2 &  | 1 & 2 |
   |   33 MHz   |       |        |        | 2, 3 |  3   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486DX-  | 33MHz | Closed |  Open  | 1 &  | 1 &  | 1 & 2 |
   |   33 MHz   |       |        |        | 2, 3 |  2   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486DX-  | 50MHz |  Open  |  Open  | 1 &  | 2 &  | 1 & 2 |
   |   25 MHz   |       |        |        | 2, 3 |  3   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486DX-  | 25MHz |  Open  |  Open  | 1 &  | 1 &  | 1 & 2 |
   |   25 MHz   |       |        |        | 2, 3 |  2   |       |
   |            |       |        |        | & 4  |      |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486SX-  | 50MHz |  Open  |  Open  | 2 &  | 2 &  | Open  |
   |   25 MHz   |       |        |        |  3   |  3   |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486SX-  | 25MHz |  Open  |  Open  | 2 &  | 1 &  | Open  |
   |   25 MHz   |       |        |        |  3   |  2   |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486SX-  | 40MHz |  Open  |  Open  | 2 &  | 2 &  | Open  |
   |   20 MHz   |       |        |        |  3   |  3   |       |
   |------------+-------+--------+--------+------+------+-------|
   |  80486SX-  | 20MHz |  Open  |  Open  | 2 &  | 1 &  | Open  |
   |   20 MHz   |       |        |        |  3   |  2   |       |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position.     |
   +------------------------------------------------------------+