(TXT) View Source
       
       # COMPAQ COMPUTER CORPORATION
       
          PRESARIO 400 SERIES
       
          Processor    80486SX/80487SX/80486DX/ODP486SX/80486DX2         
          Processor    25/33/50(internal)/66(internal)MHz                
          Speed        
          Chip Set     Compaq                                            
          Max. Onboard 16MB                                              
          DRAM         
          Cache        None                                              
          BIOS         AMI                                               
          Dimensions   330mm x 218mm                                     
          I/O Options  Riser card, floppy drive interface, game port,    
                       IDE interface, parallel port, PS/2 mouse port,    
                       serial port                                       
          NPU Options  None                                              
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose         | Location | Purpose            | Location |
          |-----------------+----------+--------------------+----------|
          | PS/2 mouse port |   CN1    | Power LED &        |    J2    |
          |                 |          | keylock            |          |
          |-----------------+----------+--------------------+----------|
          | Serial port     |   CN2    | Floppy drive       |    J3    |
          |                 |          | interface          |          |
          |-----------------+----------+--------------------+----------|
          | Parallel port   |   CN3    | Speaker            |   J13    |
          |-----------------+----------+--------------------+----------|
          | Game port       |   CN4    | External battery   |   J16    |
          |-----------------+----------+--------------------+----------|
          | Modem ports     |   CN5    | Riser Card         |   SL1    |
          |-----------------+----------+--------------------+----------|
          | IDE interface   |    J1    |                    |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |             Function             | Jumper |    Position    |
          |----------------------------------+--------+----------------|
          | » | CPU type select PGA          |   P2   |   pins 2 & 3   |
          |   |                              |        |     closed     |
          |---+------------------------------+--------+----------------|
          |   | CPU type select PQFP         |   P2   |   pins 1 & 2   |
          |   |                              |        |     closed     |
          |---+------------------------------+--------+----------------|
          | » | CMOS memory normal operation |   P6   |      Open      |
          |---+------------------------------+--------+----------------|
          |   | CMOS memory clear            |   P6   |     Closed     |
          |---+------------------------------+--------+----------------|
          | » | Modem ROM select internal    |   P7   |   pins 1 & 2   |
          |   |                              |        |     closed     |
          |---+------------------------------+--------+----------------|
          |   | Modem ROM select external    |   P7   |   pins 2 & 3   |
          |   |                              |        |     closed     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          |       Size       |       Bank 0       |       Bank 1       |
          |------------------+--------------------+--------------------|
          |       1MB        |   (1) 256K x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |       2MB        |   (1) 256K x 36    |   (1) 256K x 36    |
          |------------------+--------------------+--------------------|
          |       2MB        |   (1) 512K x 36    |        NONE        |
          |------------------+--------------------+--------------------|
          |       3MB        |   (1) 256K x 36    |   (1) 512K x 36    |
          |------------------+--------------------+--------------------|
          |       4MB        |   (1) 512K x 36    |   (1) 512K x 36    |
          |------------------+--------------------+--------------------|
          |       4MB        |    (1) 1M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       5MB        |   (1) 256K x 36    |    (1) 1M x 36     |
          |------------------+--------------------+--------------------|
          |       6MB        |   (1) 512K x 36    |    (1) 1M x 36     |
          |------------------+--------------------+--------------------|
          |       8MB        |    (1) 1M x 36     |    (1) 1M x 36     |
          |------------------+--------------------+--------------------|
          |       8MB        |    (1) 2M x 36     |        NONE        |
          |------------------+--------------------+--------------------|
          |       9MB        |   (1) 256K x 36    |    (1) 2M x 36     |
          |------------------+--------------------+--------------------|
          |       10MB       |   (1) 512K x 36    |    (1) 2M x 36     |
          |------------------+--------------------+--------------------|
          |       12MB       |    (1) 1M x 36     |    (1) 2M x 36     |
          |------------------+--------------------+--------------------|
          |       16MB       |    (1) 2M x 36     |    (1) 2M x 36     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |     Type      |        P3        |     P4     |     P5     |
          |---------------+------------------+------------+------------|
          |    80486SX    |    pins 1 & 2    | pins 1 & 2 | pins 1 & 2 |
          |    (PQFP)     |      closed      |   closed   |   closed   |
          |---------------+------------------+------------+------------|
          | 80486SX (PGA) |    pins 2 & 3    | pins 2 & 3 | pins 3 & 4 |
          |               |      closed      |   closed   |   closed   |
          |---------------+------------------+------------+------------|
          |    80487SX    |    pins 1 & 2    | pins 1 & 2 | pins 2 & 3 |
          |               |      closed      |   closed   |   closed   |
          |---------------+------------------+------------+------------|
          |   ODP486SX    |    pins 1 & 2    | pins 1 & 2 | pins 2 & 3 |
          |               |      closed      |   closed   |   closed   |
          |---------------+------------------+------------+------------|
          |    80486DX    |    pins 1 & 2    | pins 1 & 2 | pins 1 & 2 |
          |               |      closed      |   closed   |   closed   |
          |---------------+------------------+------------+------------|
          |   80486DX2    |    pins 1 & 2    | pins 1 & 2 | pins 1 & 2 |
          |               |      closed      |   closed   |   closed   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |           Speed            |              P1               |
          |----------------------------+-------------------------------|
          |           25MHz            |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |           33MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           50iMHz           |       pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |           66iMHz           |       pins 2 & 3 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                MISCELLANEOUS TECHNICAL NOTE                |
          |------------------------------------------------------------|
          |               The purpose of CN6 is unknown.               |
          +------------------------------------------------------------+