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       # AST RESEARCH, INC.
       
          PREMIUM SE 486/50 (MODEL 202377-002)
       
          Processor         80486DX (on external CPU/Memory module)      
          Processor Speed   50MHz                                        
          Chip Set          AST                                          
          Max. Onboard DRAM None (32MB on external CPU/Memory module)    
          Cache             None (256KB on external CPU/Memory module)   
          BIOS              AST                                          
          Dimensions        355mm x 266mm                                
          I/O Options       32-bit external CPU/Memory module slot       
                                                                         
                            32-bit external Memory module slot (2)       
                                                                         
                            bus mouse port, floppy drive interface       
                                                                         
                            IDE interface, parallel port, serial port    
                            (2)                                          
          NPU Options       None                                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose          | Location | Purpose           | Location |
          |------------------+----------+-------------------+----------|
          | Bus mouse port   |   CN1    | External battery  |   P14    |
          |------------------+----------+-------------------+----------|
          | Speaker          |   J12    | Serial port 1     |   P17    |
          |                  |          | (COM1)            |          |
          |------------------+----------+-------------------+----------|
          | Parallel port    |   J19    | Serial port 2     |   P18    |
          |                  |          | (COM2)            |          |
          |------------------+----------+-------------------+----------|
          | Floppy drive     |   J20    | 32-bit external   |    S1    |
          | interface (A:    |          | CPU/Memory module |          |
          | and B:)          |          |                   |          |
          |------------------+----------+-------------------+----------|
          | Third floppy     |   J21    | 32-bit external   | S2 & S3  |
          | drive interface  |          | Memory module     |          |
          |                  |          | slots             |          |
          |------------------+----------+-------------------+----------|
          | IDE interface    |   J22    | Optional ROM      |    U7    |
          |                  |          | (even)            |          |
          |------------------+----------+-------------------+----------|
          | IDE interface    |   J23    | Optional ROM      |    U8    |
          | LED              |          | (odd)             |          |
          |------------------+----------+-------------------+----------|
          | Front panel      |   P11    |                   |          |
          | switches & LEDs  |          |                   |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Factory configured - do not      |   E1   |    open    |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Password check enabled           |   E2   | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Password check disabled          |   E2   | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |   E3   |    open    |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |   E4   |   closed   |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |   E5   |   closed   |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |   E6   |    open    |
          |   | alter                            |        |            |
          +------------------------------------------------------------+
       
 (IMG) IMG 2
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose                               |      Location      |
          |---------------------------------------+--------------------|
          | Reserved for future use               |        EXP         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |             Function             |  Jumper   |  Position   |
          |----------------------------------+-----------+-------------|
          | »   | Parity check enabled       |    E1     |   closed    |
          |-----+----------------------------+-----------+-------------|
          |     | Parity check disabled      |    E1     |    open     |
          |-----+----------------------------+-----------+-------------|
          | »   | Cache enabled              |    E2     |   closed    |
          |-----+----------------------------+-----------+-------------|
          |     | Cache disabled             |    E2     |    open     |
          |------------------------------------------------------------|
          | Note:AST CPU/Memory module part number is 202465-005.      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |           Size           |             Bank 0              |
          |--------------------------+---------------------------------|
          |           16MB           |           (4) 4M x 9            |
          |--------------------------+---------------------------------|
          |           32MB           |           (4) 8M x 9            |
          |------------------------------------------------------------|
          | Notes:256KB of SRAM Cache is included as a module on the   |
          | CPU/Memory module.                                         |
          |                                                            |
          | 384KB of DRAM is reserved for System and VGA BIOS          |
          | shadowing and cannot be disabled.                          |
          |                                                            |
          | Up to two of the following memory boards may be installed  |
          | in addition to the CPU/Memory                              |
          |                                                            |
          | module: AST part numbers 202275-004, 202275-006,           |
          | 202387-001, 202387-004                                     |
          |                                                            |
          | or 202387-005.                                             |
          +------------------------------------------------------------+