AST RESEARCH, INC.

ADVANTAGE! 4000 SERIES 486 (234068-001)

Processor    80486SX/SL80486SX/ODP486/80486DX/SL80486DX/CX486DX2SL/
             AM486DX2SL/80486DX2
Processor    25/33/50(internal)/66(internal)MHz
Speed
Chip Set     Unidentified
Max. Onboard 36MB
DRAM
Cache        None
BIOS         AST
Dimensions   330mm x 218mm
I/O Options  Floppy drive interface, IDE interface, parallel port, serial
             port, riser slot, power to hard drive, power to floppy drive,
             power to CD-ROM, data/fax modem cabled
NPU Options  None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Speaker               C20 (2-pin)    Power to hard drive       1245
                                       connector

  Front panel LED’s     C20 (4-pin)    Floppy drive              1250
                                       interface

  Power to CD-ROM        CD-ROM PWR    IDE interface             1251
  power connector

  Serial port               CN1        Alternate power           1252
                                       connector

  Parallel port             CN2        Front panel LED           1351
                                       connector

  Power to floppy         FDD PWR      Cable to data/fax         1604
  drive connector                      modem

  Chassis fan power         J28        Riser slot                SL1

  Note: The locations of 1245, 1604, J28, FDD PWR & CD-ROM power are
  unidentified.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not             1101             N/A
      alter

  »   Factory configured - do not             1254             N/A
      alter

  »   Factory configured - do not             1604             N/A
      alter

                            DRAM CONFIGURATION

       Size             Bank 0             Bank 1             Bank 2

       4MB                4MB               None               None

       8MB                4MB           (1) 1M x 32            None

       12MB               4MB           (1) 1M x 32        (1) 1M x 32

       20MB               4MB           (1) 4M x 32        (1) 4M x 32

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

  Note: Bank 0 is factory installed and is not configurable. The location
  is unidentified.

                          CPU TYPE CONFIGURATION

     Type         1201        1202        1203         1204        1205

   80486SX        Open       2 & 3        Open         Open        Open

  SL80486SX       Open       2 & 3       Closed       Closed       Open

    ODP486        Open       1 & 2        Open         Open        Open

   80486DX       Closed      1 & 2        Open         Open        Open

  SL80486DX      Closed      1 & 2       Closed       Closed       Open

  CX486DX2SL     Closed      1 & 2        Open         Open        Open

  AM486DX2SL     Closed      1 & 2        Open         Open        Open

   80486DX2      Closed      1 & 2        Open         Open        Open

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CON’T)

     Type        1206        1207        1208         1209        1210

   80486SX       Open        Open        Open         Open        Open

  SL80486SX      Open       Closed       2 & 3        Open        Open

    ODP486       1 & 2       Open        Open         Open        Open

   80486DX       2 & 3       Open        Open         Open        Open

  SL80486DX      2 & 3      Closed       2 & 3        Open        Open

  CX486DX2SL     2 & 3       Open        2 & 3        Open        Open

  AM486DX2SL     2 & 3       Open        1 & 2       Closed      Closed

   80486DX2      2 & 3       Open        Open         Open        Open

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CON’T)

     Type         1211         1212         1213        1301       1302

   80486SX        Open         Open         Open       1 & 2      1 & 2

  SL80486SX       Open         Open         Open       1 & 2      1 & 2

    ODP486        Open         Open         Open       1 & 2      1 & 2

   80486DX        Open         Open         Open       1 & 2      1 & 2

  SL80486DX       Open         Open         Open       1 & 2      1 & 2

  CX486DX2SL      Open        Closed       Closed      2 & 3      2 & 3

  AM486DX2SL     Closed        Open         Open       2 & 3      2 & 3

   80486DX2       Open         Open         Open       1 & 2      1 & 2

  Note: Pins designated should be in the closed position.

         CPU SPEED CONFIGURATION

  Speed      1171      1172      1173

  25MHz      Open      Open     Closed

  33MHz     Closed    Closed    Closed

  50iMHz     Open      Open     Closed

  66iMHz    Closed    Closed    Closed

                         CPU VOLTAGE CONFIGURATION

     Voltage         1214          1215           1216           1217

        3.3v         Open         Closed       Pins 2 & 3       Closed
                                                 closed

  »      5v         Closed         Open        Pins 2 & 3        Open
                                                 closed