
COMPAQ COMPUTER CORPORATION

PRESARIO 800

Processor   80486SX/80486SX2/80487SX/80486DX/ODP486SX/80486DX2/Pentium
            Overdrive
Processor   25/33/50(internal)/66(internal)MHz
Speed
Chip Set    Compaq
Max.        64MB
Onboard
DRAM
Cache       128KB (on external cache card)
BIOS        AMI
Dimensions  330mm x 218mm
I/O Options External cache card slot, floppy drive interface, IDE
            interface, parallel port, PS/2 mouse port, serial port, VGA
            feature connector, VGA port
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port                 CN1      IDE interface               CN6

  PS/2 mouse port             CN2      VGA feature connector       CN7

  Parallel port               CN3      External battery            J17

  VGA port                    CN4      Speaker                     P11

  Floppy drive interface      CN5      External cache card         SL1
                                       slot

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     Pentium Overdrive mode select           P1            Pins 2 & 3
      write back                                              closed

      Pentium Overdrive mode select           P1            Pins 1 & 2
      write through                                           closed

     On board video enabled                  P5            Pins 2 & 3
                                                              closed

      On board video disabled                 P5            Pins 1 & 2
                                                              closed

     Parallel port IRQ select IRQ7           P8            Pins 1 & 2
                                                              closed

      Parallel port IRQ select IRQ5           P8            Pins 2 & 3
                                                              closed

     CMOS memory normal operation            P9              Closed

      CMOS memory clear                       P9               Open

                            DRAM CONFIGURATION

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     4MB        (1) 1M x 36      NONE           NONE            NONE

     5MB        (1) 1M x 36    (1) 256K x       NONE            NONE
                                  36

     6MB        (1) 1M x 36    (1) 256K x     (1) 256K x        NONE
                                  36             36

     7MB        (1) 1M x 36    (1) 256K x     (1) 256K x    (1) 256K x 36
                                  36             36

     8MB        (1) 1M x 36   (1) 1M x 36       NONE            NONE

     9MB        (1) 1M x 36   (1) 1M x 36     (1) 256K x        NONE
                                                 36

     10MB       (1) 1M x 36   (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                 36

     12MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36        NONE

     13MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

     16MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     20MB       (1) 1M x 36   (1) 4M x 36       NONE            NONE

     21MB       (1) 1M x 36   (1) 4M x 36     (1) 256K x        NONE
                                                 36

     22MB       (1) 1M x 36   (1) 4M x 36     (1) 256K x    (1) 256K x 36
                                                 36

     24MB       (1) 1M x 36   (1) 4M x 36    (1) 1M x 36        NONE

     25MB       (1) 1M x 36   (1) 4M x 36    (1) 1M x 36    (1) 256K x 36

     28MB       (1) 1M x 36   (1) 4M x 36    (1) 1M x 36     (1) 1M x 36

     36MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36        NONE

     36MB       (1) 1M x 36   (1) 8M x 36       NONE            NONE

     37MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36    (1) 256K x 36

     37MB       (1) 1M x 36   (1) 8M x 36     (1) 256K x        NONE
                                                 36

     38MB       (1) 1M x 36   (1) 8M x 36     (1) 256K x    (1) 256K x 36
                                                 36

     40MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36     (1) 1M x 36

     40MB       (1) 1M x 36   (1) 8M x 36    (1) 1M x 36        NONE

     41MB       (1) 1M x 36   (1) 8M x 36    (1) 1M x 36    (1) 256K x 36

     44MB       (1) 1M x 36   (1) 8M x 36    (1) 1M x 36     (1) 1M x 36

     52MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

     52MB       (1) 1M x 36   (1) 8M x 36    (1) 4M x 36        NONE

     53MB       (1) 1M x 36   (1) 8M x 36    (1) 4M x 36    (1) 256K x 36

     56MB       (1) 1M x 36   (1) 8M x 36    (1) 4M x 36     (1) 1M x 36

     64MB       (1) 1M x 36   (1) 8M x 36    (1) 4M x 36     (1) 4M x 36

  Note: When 64MB of memory is installed, Bank 0 is ignored. Do not
  remove the 1M x 36 from Bank 0.

                          CPU TYPE CONFIGURATION

        Type            P2         P3        P4         P6         P7

     80486SX-25       1 & 2      1 & 2      3 & 4      1 & 2      1 & 2

     80486SX-33       1 & 2      1 & 2      3 & 4      1 & 2      2 & 3

     80487SX-25       1 & 2      1 & 2      3 & 4      1 & 2      1 & 2

     80486DX-25       2 & 3      2 & 3      1 & 2      1 & 2      1 & 2

     80486DX-33       2 & 3      2 & 3      1 & 2      1 & 2      2 & 3

    80486SX2-66       2 & 3      2 & 3      1 & 2      1 & 2      2 & 3

    80486DX2-50       2 & 3      2 & 3      1 & 2      1 & 2      1 & 2

    80486DX2-66       2 & 3      2 & 3      1 & 2      1 & 2      2 & 3

        ODP           2 & 3      2 & 3      2 & 3      1 & 2       N/A

        ODPR          2 & 3      2 & 3      1 & 2      1 & 2       N/A

    Pentium ODP       2 & 3      2 & 3      2 & 3      2 & 3       N/A

            Note: N/A - jumper setting depends on processor speed. Pins
            designated should be in the closed position.

         CPU SPEED CONFIGURATION

        Speed                 P7

        25MHz         Pins 1 & 2 closed

        33MHz         Pins 2 & 3 closed

       50iMHz         Pins 1 & 2 closed

       66iMHz         Pins 2 & 3 closed

