
AST RESEARCH, INC.

PREMMIA SYSTEM BOARD (P/N202514-00X)

Processor     80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Processor     25/33/50(internal)/66(internal)MHz
Speed
Chip Set      ATI
Max. Onboard  128MB
DRAM
Cache         64/256KB (Located on the external cache module)
BIOS          AST
Dimensions    355mm x 304mm
I/O Options   Cache/Pentium upgrade module, floppy drive interface (2),
              IDE interface,

              parallel port, PS/2 mouse port, serial ports (2), VGA
              feature connector,

              video port
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Bus mouse port             J12       Manufacturers test        J23
                                       header

  Parallel port              J13       Floppy drive interface     J24
                                       1 & 2

  Serial port 1              J14       Floppy drive interface     J25
                                       3

  Personality/feature        J15       External battery           J26
  connector

  Personality/feature        J16       Speaker                    J27
  connector

  Pentium/Cache module       J17       Chassis fan power          J28
  upgrade

  SVGA monitor port          J18       Front console header       J29

  VGA port                   J19       Manufacturers test        J30
                                       header

  Serial port 2              J20       IDE interface LED          J35

  IDE interface              J22       Personality/feature        J46
                                       connector

  Note:The personality/feature connectors alow various network modules to
  be added to the system.

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

     Factory configured - do not            E2                Open
      alter

     Pariity checking enabled               E3               Closed

      Pariity checking disabled              E3                Open

     Flash BIOS voltage 12V                 E5              pins 2 & 3
                                                              closed

      Flash BIOS voltage 5V                  E5              pins 1 & 2
                                                               open

     VGA enabled                       SW1/switch 1            On

      VGA disabled                      SW1/switch 1            Off

     Factory configured - do not       SW1/switch 2            N/A
      alter

     CMOS memory normal operation      SW1/switch 3            Off

      CMOS memory clear                 SW1/switch 3            On

     BIOS normal operation             SW1/switch 4            Off

      BIOS forced update                SW1/switch 4            On

     Password override                 SW1/switch 5            Off

      Password inhibited                SW1/switch 5            On

     Factory configured - do not       SW1/switch 6            Off
      alter

     Factory configured - do not       SW1/switch 7            Off
      alter

     Factory configured - do not       SW1/switch 8            Off
      alter

     Factory configured - do not       SW1/switch 9            Off
      alter

     Monitor type select color         SW1/switch 10           On

      Monitor type select               SW1/switch 10           Off
      monochrome

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

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

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

      4MB        (1) 2M x 36   (1) 2M x 36        NONE           NONE

      6MB        (1) 1M x 36   (1) 1M x 36    (1) 2M x 36    (1) 2M x 36

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

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

     10MB        (1) 1M x 36   (1) 1M x 36    (1) 4M x 36    (1) 4M x 36

     12MB        (1) 2M x 36   (1) 2M x 36    (1) 4M x 36    (1) 4M x 36

     16MB        (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     16MB        (1) 8M x 36   (1) 8M x 36        NONE           NONE

     18MB        (1) 1M x 36   (1) 1M x 36    (1) 8M x 36    (1) 8M x 36

     20MB        (1) 2M x 36   (1) 2M x 36    (1) 8M x 36    (1) 8M x 36

     24MB        (1) 4M x 36   (1) 4M x 36    (1) 8M x 36    (1) 8M x 36

     32MB        (1) 8M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

     32MB        (1) 16M x 36  (1) 16M x 9        NONE           NONE

     34MB        (1) 1M x 36   (1) 1M x 36    (1) 16M x 36   (1) 16M x 36

     36MB        (1) 2M x 36   (1) 2M x 36    (1) 16M x 36   (1) 16M x 36

     40MB        (1) 4M x 36   (1) 4M x 36    (1) 16M x 36   (1) 16M x 36

     48MB        (1) 8M x 36   (1) 8M x 36    (1) 16M x 36   (1) 16M x 36

     64MB        (1) 16M x 36  (1) 16M x 36   (1) 16M x 36   (1) 16M x 36

     64MB        (1) 32M x 36  (1) 32M x 36       NONE           NONE

     66MB        (1) 1M x 36   (1) 1M x 36    (1) 32M x 36   (1) 32M x 36

     68MB        (1) 2M x 36   (1) 2M x 36    (1) 32M x 36   (1) 32M x 36

     72MB        (1) 4M x 36   (1) 4M x 36    (1) 32M x 36   (1) 32M x 36

     80MB        (1) 8M x 36   (1) 8M x 36    (1) 32M x 36   (1) 32M x 36

     96MB        (1) 16M x 36  (1) 16M x 36   (1) 32M x 36   (1) 32M x 36

     128MB       (1) 32M x 36  (1) 32M x 36   (1) 32M x 36   (1) 32M x 36

                          CPU TYPE CONFIGURATION

   PQFP             PGA          Pentium     E1      E4      E6      E7

  80486SX          None            None      pins    pins    pins    pins
                                            2 & 3   1 & 2   1 & 2   1 & 2

  80486SX         80487SX          None      pins    pins    pins    pins
                                            2 & 3   1 & 2   1 & 2   1 & 2

  80486SX        ODP486SX          None      pins    pins    pins    pins
                                            2 & 3   1 & 2   1 & 2   1 & 2

  80486SX    80486DX/80486DX2      None      pins    pins    pins    pins
                                            1 & 2   2 & 3   1 & 2   1 & 2

  80486DX          None            None      pins    pins    pins    pins
                                            2 & 3   1 & 2   1 & 2   1 & 2

  80486DX    80486DX/80486DX2      None      pins    pins    pins    pins
                                            1 & 2   2 & 3   1 & 2   1 & 2

  80486DX        ODP486SX          None      pins    pins    pins    pins
                                            2 & 3   1 & 2   1 & 2   1 & 2

   None           80486SX          None     Open    Open     pins    pins
                                                            2 & 3   2 & 3

   None      80486DX/80486DX2      None     Open     pins    pins    pins
                                                    2 & 3   1 & 2   1 & 2

   None          ODP486SX          None     Open     pins    pins    pins
                                                    1 & 2   1 & 2   1 & 2

    Any            None            Yes       pins    pins    pins    pins
                                            2 & 3   1 & 2   1 & 2   1 & 2

   None            None            Yes      Open     pins    pins    pins
                                                    1 & 2   1 & 2   1 & 2

  Note:Pins designated should be in the closed position.

  Before installing the Pentium upgrade board, remove the processor in
  the ZIF socket at U13.

      VIDEO MEMORY CONFIGURATION

    Size        Bank 0      Bank 1

     1MB       (2) 46256   (2) 46256

     2MB       (2) 46256   (2) 46256

