AST RESEARCH, INC.

ADVANTAGE! PLUS SYSTEM BOARD

(202529-001,2,3,4)

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   25/33/50(internal)/66(internal)MHz
Chip Set          VLSI
Max. Onboard DRAM 32MB
Cache             64/256KB
BIOS              AST
Dimensions        330mm x 218mm
I/O Options       Floppy drive interface, IDE interface, parallel port,
                  serial ports (2)
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  Parallel port                J1       Turbo LED                  JP3

  Serial port 2                J2       Reset switch               JP4

  Serial port 1                J3       Speaker                    JP5

  Floppy drive interface       J4       Hard drive LED             JP6

  IDE interface                J5       External battery          JP22

  Power LED & keylock          JP2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color               JP1             Closed

      Monitor type select monochrome          JP1              Open

  »   I/O bus speed select ATCLK              JP18             Open
      disabled

      I/O bus speed select ATCLK              JP18            Closed
      enabled

  »   IRQ7 select enabled                     JP19          pins 2 & 3
                                                              closed

      IRQ5 select enabled                     JP19          pins 1 & 2
                                                              closed

  »   I/O port enabled                        JP20          pins 1 & 2
                                                              closed

      I/O port disabled                       JP20          pins 2 & 3
                                                              closed

  »   CMOS memory normal operation            JP21          pins 2 & 3
      (Internal Battery)                                      closed

      CMOS memory normal operation            JP21             Open
      (External Battery)

      CMOS memory clear                       JP21          pins 1 & 2
                                                              closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB        (4) 256K x 9        NONE

      2MB        (4) 256K x 9     (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 1M x 9      (4) 256K x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 4M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                         CACHE CONFIGURATION

     Size        Bank 0        Bank 1       TAG/U19       TAG/U20

     64KB      (4) 8K x 8    (4) 8K x 8    (1) 8K x 8       NONE

    256KB      (4) 32 x 8    (4) 32 x 8    (1) 32 x 8    (1) 64 x 1

               CACHE CONFIGURATION

   Size      JP7      JP11      JP12      JP13

   64KB     Open      Open      Open      Open

  256KB    Closed    Closed     Open     Closed

                          CPU TYPE CONFIGURATION

       Type               JP8                JP9               JP10

     80486SX              Open            pins 2 & 3           Open
                                            closed

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

     80486DX           pins 1 & 2         pins 1 & 2          Closed
                         closed             closed

     80486DX2          pins 1 & 2         pins 1 & 2          Closed
                         closed             closed

                          CPU SPEED CONFIGURATION

   Speed         JP14            JP15           JP16            JP17

   25MHz       pins 2 & 3     pins 2 & 3      pins 1 & 2      pins 2 & 3
                closed          closed         closed          closed

   33MHz       pins 2 & 3     pins 1 & 2      pins 1 & 2      pins 2 & 3
                closed          closed         closed          closed

  50I MHz      pins 2 & 3     pins 2 & 3      pins 1 & 2      pins 2 & 3
                closed          closed         closed          closed

  66I MHz      pins 2 & 3     pins 1 & 2      pins 1 & 2      pins 2 & 3
                closed          closed         closed          closed