
AST RESEARCH, INC.

PREMMIA MX 4/66D, PREMMIA MX 4/100T

Processor      80486SX/486 Overdrive/80486DX/80486DX2/80486DX4/P24T
Processor      25/33/50(internal)/66(internal)/100(internal)MHz
Speed
Chip Set       Unidentified
Video Chip Set ATI
Maximum        128MB
Onboard Memory
Maximum Video  4MB
Memory
Cache          64/256KB
BIOS           Unidentified
Dimensions     330mm x 218mm
I/O Options    Floppy drive interface, IDE interfaces (2), parallel port,
               PS/2 mouse port, serial ports (2), riser slot
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                Location

  PS/2 mouse port           CN2        External battery          J26

  Serial port               CN3        Speaker                   J27

  Serial port               CN4        Chassis fan power         J28

  Parallel port             CN5        Front console LED     J29 pins 1 -
                                                                  4

  IDE interface 1           J22        Chassis fan power         J32

  IDE interface 2           J23        IDE interface LED         J40

  Floppy drive              J24        Riser slot                SL1
  interface

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Factory configured - do not alter        E6           Pins 1 & 2
                                                              closed

     CMOS memory normal operation             E8              Open

      CMOS memory clear                        E8             Closed

     Flash BIOS normal operation            SW1/1             Off

      Flash BIOS force update at boot        SW1/1              On

     Password normal operation              SW1/2              On

      Password clear                         SW1/2             Off

     Monitor type select color              SW1/3              On

      Monitor type select monochrome         SW1/3             Off

     Setup access enabled                   SW1/4             Off

      Setup access disabled                  SW1/4              On

     Factory configured - do not alter      SW1/5             Off

     Factory configured - do not alter      SW1/6              On

     Factory configured - do not alter      SW1/7              On

     Factory configured - do not alter      SW1/8              On

                            DRAM CONFIGURATION

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     4MB        (1) 1M x 32      None           None            None

     8MB        (1) 2M x 32      None           None            None

     8MB        (1) 1M x 32   (1) 1M x 32       None            None

     9MB        (1) 1M x 32   (1) 1M x 32     (1) 256K x        None
                                                 32

     10MB       (1) 1M x 32   (1) 1M x 32     (1) 256K x    (1) 256K x 32
                                                 32

     12MB       (1) 1M x 32   (1) 1M x 32    (1) 1M x 32        None

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

     16MB       (1) 4M x 32      None           None            None

     17MB       (1) 2M x 32   (1) 2M x 32     (1) 256K x        None
                                                 32

     18MB       (1) 2M x 32   (1) 2M x 32     (1) 256K x    (1) 256K x 32
                                                 32

     20MB       (1) 2M x 32   (1) 2M x 32    (1) 1M x 32        None

     24MB       (1) 2M x 32   (1) 2M x 32    (1) 1M x 32     (1) 1M x 32

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1        Bank 2          Bank 3

     24MB        (1) 2M x 32   (1) 2M x 32   (1) 2M x 32        None

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

     32MB        (1) 8M x 32      None          None            None

     32MB        (1) 4M x 32   (1) 4M x 32      None            None

     33MB        (1) 4M x 32   (1) 4M x 32    (1) 256K x        NONE
                                                 32

     34MB        (1) 4M x 32   (1) 4M x 32    (1) 256K x    (1) 256K x 32
                                                 32

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

     40MB        (1) 4M x 32   (1) 4M x 32   (1) 1M x 32     (1) 1M x 32

     40MB        (1) 4M x 32   (1) 4M x 32   (1) 2M x 32        NONE

     48MB        (1) 4M x 32   (1) 4M x 32   (1) 2M x 32     (1) 2M x 32

     48MB        (1) 4M x 32   (1) 4M x 32   (1) 4M x 32        NONE

     64MB        (1) 4M x 32   (1) 4M x 32   (1) 4M x 32     (1) 4M x 32

     64MB        (1) 8M x 32   (1) 8M x 32      NONE            NONE

     66MB        (1) 8M x 32   (1) 8M x 32    (1) 256K x    (1) 256K x 32
                                                 32

     68MB        (1) 8M x 32   (1) 8M x 32   (1) 1M x 32        NONE

     72MB        (1) 8M x 32   (1) 8M x 32   (1) 1M x 32     (1) 1M x 32

     72MB        (1) 8M x 32   (1) 8M x 32   (1) 2M x 32        NONE

     80MB        (1) 8M x 32   (1) 8M x 32   (1) 2M x 32     (1) 2M x 32

     80MB        (1) 8M x 32   (1) 8M x 32   (1) 4M x 32        NONE

     96MB        (1) 8M x 32   (1) 8M x 32   (1) 4M x 32     (1) 4M x 32

     96MB        (1) 8M x 32   (1) 8M x 32   (1) 8M x 32        NONE

     128MB       (1) 8M x 32   (1) 8M x 32   (1) 8M x 32     (1) 8M x 32

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 9

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 9

  CACHE JUMPER CONFIGURATION

     Size             E5

     64KB            Open

     256KB          Closed

                     CPU SPEED SELECTION

        Speed                 E7                   E9

        25MHz          Pins 1 & 2 closed         Closed

        33MHz          Pins 2 & 3 closed          Open

       50iMHz          Pins 1 & 2 closed         Closed

       66iMHz          Pins 2 & 3 closed          Open

       100iMHz         Pins 1 & 2 closed         Closed

  Note: If 100iMHz is used, jumper E4 must be open.

   CPU SPEED SELECTION (80486DX4 ONLY)

       Voltage                E4

         2x           Pins 2 & 3 closed

        2.5x          Pins 1 & 2 closed

         3x                  Open

                            CPU TYPE SELECTION

       Type            E1           E2             E3             E10

  80486SX (PQFP)      Open       Pins 2 & 3     Pins 1 & 2      Closed
                                  closed         closed

  486 Overdrive       Open       Pins 2 & 3     Pins 1 & 2      Closed
                                  closed         closed

     80486DX          Open       Pins 1 & 2     Pins 1 & 2      Closed
                                  closed         closed

     80486DX2         Open       Pins 1 & 2     Pins 1 & 2      Closed
                                  closed         closed

  80486DX2 (WB)       Open       Pins 1 & 2     Pins 2 & 3       Open
                                  closed         closed

     80486DX4         Open       Pins 1 & 2     Pins 1 & 2      Closed
                                  closed         closed

       P24T           Open       Pins 2 & 3     Pins 2 & 3       Open
                                  closed         closed

            Note: E10 may not be present not on all boards. To use write
            through cache on P24T, set E1 to the closed position.

                         CPU VOLTAGE CONFIGURATION

   Voltage      E11       E12      E13      E14        E15         E16

  3v Cyrix     2 & 3     2 & 3    2 & 3    2 & 3       Open       1 & 2

  3v Intel     1 & 2     1 & 2    1 & 2    1 & 2      Closed      2 & 3

  5v Cyrix     2 & 3     2 & 3    2 & 3    2 & 3       Open        Open

  5v Intel     1 & 2     1 & 2    1 & 2    1 & 2      Closed       Open

            Note: Pins designated should be in the closed position. The
            location of E12 is unidentified. The above jumpers may not be
            present on all boards. If these jumpers are not present, only
            Intel CPUs may be used.

