
AST RESEARCH, INC.

PREMMIA 486

(202514-000,202557-000,101,202613-X0X)

Processor     80486SX/80487SX/ODP486SX/80486DX/80486DX2/Pentium
              Overdrive/Pentium
Processor     25/33/50(internal)/60/66(internal)MHz
Speed
Chip Set      Unidentified
Max. Onboard  128MB
DRAM
Cache         128/256/512KB
BIOS          Unidentified
Dimensions    355mm x 305mm
I/O Options   Floppy drive interface, IDE interfaces (2), parallel port,
              PS/2 mouse port, serial ports (2), VGA port, CPU/cache slot,
              LAN connectors (3)
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port                 CN1      Floppy drive interface      J25
                                       2

  Parallel port               CN2      External battery            J26

  PS/2 mouse port             CN3      Speaker                     J27

  Serial port                 CN4      Chassis fan power           J28

  VGA port                    CN5      Front panel connector       J29

  LAN module connector        J15      Test connector              J30

  LAN module connector        J16      IDE interface LED           J35

  IDE interface               J22      LAN module connector        J46

  Test connector              J23      CPU/cache slot              SL1

  Floppy drive interface      J24
  1

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

     Factory configured - do not            CN6                N/A
      alter

     Factory configured - do not            E2                Open
      alter

     Parity enabled                         E3               Closed

      Parity disabled                        E3                Open

     Factory configured - do not            E5              pins 2 & 3
      alter                                                   closed

     On board video enabled                SW1/1               On

      On board video disabled               SW1/1               Off

     Factory configured - do not           SW1/2               Off
      alter

     CMOS memory normal operation          SW1/3               Off

      CMOS memory clear                     SW1/3               On

     Flash BIOS normal operation           SW1/4               Off

      Flash BIOS force update at            SW1/4               On
      boot

     Password enabled                      SW1/5               Off

      Password disabled                     SW1/5               On

     Factory configured - do not           SW1/6               Off
      alter

     Factory configured - do not           SW1/7               Off
      alter

     Factory configured - do not           SW1/8               Off
      alter

     I/O address select 398h               SW1/9               On

      I/O address select 26Eh               SW1/9               Off

     Monitor type select color            SW1/10               On

      Monitor type select                  SW1/10               Off
      monochrome

  Note: E5 may not be present on all revisions.

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     2MB         (1) 256K x     (1) 256K x       NONE           NONE
                     36            36

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

     4MB         (1) 512K x     (1) 512K x       NONE           NONE
                     36            36

     6MB         (1) 256K x     (1) 256K x     (1) 512K x   (1) 512K x 36
                     36            36             36

     8MB         (1) 512K x     (1) 512K x     (1) 512K x   (1) 512K x 36
                     36            36             36

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

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

     12MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 1M x 36
                     36            36

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

     16MB       (1) 2M x 36    (1) 2M x 36       NONE           NONE

     18MB        (1) 256K x     (1) 256K x    (1) 2M x 36    (1) 2M x 36
                     36            36

     20MB        (1) 512K x     (1) 512K x    (1) 2M x 36    (1) 2M x 36
                     36            36

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 2M x 36    (1) 2M x 36

     32MB       (1) 2M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     32MB       (1) 4M x 36    (1) 4M x 36       NONE           NONE

     34MB        (1) 256K x     (1) 256K x    (1) 4M x 36    (1) 4M x 36
                     36            36

     36MB        (1) 512K x     (1) 512K x    (1) 4M x 36    (1) 4M x 36
                     36            36

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

     48MB       (1) 2M x 36    (1) 2M x 36    (1) 4M x 36    (1) 4M x 36

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

     64MB       (1) 8M x 36    (1) 8M x 36       NONE           NONE

     66MB        (1) 256K x     (1) 256K x    (1) 8M x 36    (1) 8M x 36
                     36            36

     68MB        (1) 512K x     (1) 512K x    (1) 8M x 36    (1) 8M x 36
                     36            36

     72MB       (1) 1M x 36    (1) 1M x 36    (1) 8M x 36    (1) 8M x 36

     80MB       (1) 2M x 36    (1) 2M x 36    (1) 8M x 36    (1) 8M x 36

     96MB       (1) 4M x 36    (1) 4M x 36    (1) 8M x 36    (1) 8M x 36

    128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

                            CACHE CONFIGURATION

               Size                                  SL1

               128KB                              Installed

               256KB                              Installed

               512KB                              Installed

  Note: Only one size can be installed at any one time. If CPU card is
  installed, cache cannot be installed.

                          CPU TYPE CONFIGURATION

      Type             E1            E4            E6             E7

  80486SX (PQFP)   pins 2 & 3     pins 1 & 2    pins 1 & 2    pins 1 & 2
                     closed        closed        closed         closed

  80486SX (PGA)    pins 1 & 2       Open        pins 2 & 3    pins 2 & 3
                     closed                      closed         closed

     80487SX       pins 2 & 3     pins 1 & 2    pins 1 & 2    pins 1 & 2
                     closed        closed        closed         closed

    odp486sx       pins 2 & 3     pins 1 & 2    pins 1 & 2    pins 1 & 2
                     closed        closed        closed         closed

     80486DX       pins 1 & 2     pins 2 & 3    pins 1 & 2    pins 1 & 2
                     closed        closed        closed         closed

    80486DX2       pins 1 & 2     pins 2 & 3    pins 1 & 2    pins 1 & 2
                     closed        closed        closed         closed

     Pentium       pins 1 & 2     pins 1 & 2    pins 1 & 2    pins 1 & 2
    Overdrive        closed        closed        closed         closed

     Pentium       pins 1 & 2     pins 1 & 2    pins 1 & 2    pins 1 & 2
                     closed        closed        closed         closed

  Note: If PQFP is used, E1 is open.

                  VIDEO MEMORY CONFIGURATION

        Size                Bank 0               Bank 1

         1MB                 1MB                  NONE

         2MB                 1MB             (2) 256K x 16

  Note: Bank 0 is factory installed and is not configurable.

          MISCELLANEOUS TECHNICAL NOTE

  Note: The location of pin 1 is unidentified.

