(TXT) View Source
       
       # JC INFORMATION SYSTEMS CORPORATION
       
          HIGH PERFORMANCE 486 SX/DX (MODEL 2270)
       
          Processor             80486SX/80486DX/80486DX2                 
          Processor Speed       25/33/40/50/50(internal)/66(internal)MHz 
          Chip Set              Unidentified                             
          Video Chip Set        None                                     
          Maximum Onboard       64MB                                     
          Memory                
          Maximum Video Memory  None                                     
          Cache                 64/256KB                                 
          BIOS                  AMI                                      
          Dimensions            254mm x 218mm                            
          I/O Options           32-bit VESA local bus slots (2)          
          NPU Options           None                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose           | Location | Purpose          | Location |
          |-------------------+----------+------------------+----------|
          | External battery  |    J1    | Turbo LED        |   JP20   |
          |-------------------+----------+------------------+----------|
          | Power LED &       |   J20    | Reset switch     |    S1    |
          | keylock           |          |                  |          |
          |-------------------+----------+------------------+----------|
          | Speaker           |   JP9    | 32-bit VESA      |  SL1 &   |
          |                   |          | local bus slots  |   SL2    |
          |-------------------+----------+------------------+----------|
          | Turbo switch      |   JP19   |                  |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | CMOS memory normal operation    |  JP1  |  Pins 2 & 3  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | CMOS memory clear               |  JP1  |  Pins 1 & 2  |
          |   |                                 |       |    closed    |
          |---+---------------------------------+-------+--------------|
          |   | External battery installed at   |  JP1  |     Open     |
          |   | J1                              |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Monitor type select             |  JP2  |     Open     |
          |   | monochrome/EGA                  |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Monitor type select CGA         |  JP2  |    Closed    |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP10  |    Closed    |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Jumper information unavailable  | JP11  | Unidentified |
          |---+---------------------------------+-------+--------------|
          |   | Jumper information unavailable  | JP12  | Unidentified |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP21  |     Open     |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | JP22  |     Open     |
          |   | alter                           |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       1MB        |    (4) 256K x 9    |        None        |
          |------------------+--------------------+--------------------|
          |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
          |------------------+--------------------+--------------------|
          |       4MB        |     (4) 1M x 9     |        None        |
          |------------------+--------------------+--------------------|
          |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
          |------------------+--------------------+--------------------|
          |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       16MB       |     (4) 4M x 9     |        None        |
          |------------------+--------------------+--------------------|
          |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       64MB       |    (4) 16M x 9     |        None        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       64KB       |     (4) 8K x 8     |     (4) 8K x 8     |
          |------------------+--------------------+--------------------|
          |      256KB       |    (4) 32K x 8     |    (4) 32K x 8     |
          |------------------------------------------------------------|
          | Note: The location of banks 0 & 1 are unidentified.        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  |       JP3       |      JP4       |  JP17  |  JP18  |
          |-------+-----------------+----------------+--------+--------|
          | 64KB  |   Pins 2 & 3    |   Pins 2 & 3   |  Open  |  Open  |
          |       |     closed      |     closed     |        |        |
          |-------+-----------------+----------------+--------+--------|
          | 128KB |   Pins 1 & 2    |   Pins 1 & 2   | Closed |  Open  |
          |       |     closed      |     closed     |        |        |
          |-------+-----------------+----------------+--------+--------|
          | 256KB |   Pins 2 & 3    |   Pins 2 & 3   | Closed | Closed |
          |       |     closed      |     closed     |        |        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CPU SPEED SELECTION                     |
          |------------------------------------------------------------|
          |     Speed     |     JP5      |     JP6      |     JP7      |
          |---------------+--------------+--------------+--------------|
          |     25MHz     |     Open     |     Open     |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     33MHz     |    Closed    |     Open     |     Open     |
          |---------------+--------------+--------------+--------------|
          |     40MHz     |    Closed    |    Closed    |     Open     |
          |---------------+--------------+--------------+--------------|
          |    50iMHz     |     Open     |     Open     |    Closed    |
          |---------------+--------------+--------------+--------------|
          |     50MHz     |     Open     |    Closed    |     Open     |
          |---------------+--------------+--------------+--------------|
          |    66iMHz     |    Closed    |     Open     |     Open     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     CPU TYPE SELECTION                     |
          |------------------------------------------------------------|
          |   Type    |   JP8   |  JP13   |  JP14   |   JP15   | JP16  |
          |-----------+---------+---------+---------+----------+-------|
          |  80486SX  |  2 & 3  |  Open   |  2 & 3  |   Open   | Open  |
          |-----------+---------+---------+---------+----------+-------|
          |  80486DX  |  2 & 3  |  1 & 2  |  1 & 2  |  Closed  | Open  |
          |------------------------------------------------------------|
          |      Note: Pins designated should be in the closed         |
          |      position. If PQFP is installed, JP8 must be set to 1  |
          |      & 2 and JP16 must be closed if an 80486DX or 80486DX2 |
          |      is installed                                          |
          +------------------------------------------------------------+