UNIDENTIFIED

AC 486 MODEL PQFP

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      16/20/25/33/50(internal)/66(internal)MHz
Chip Set             ACC
Max. Onboard DRAM    32MB
Cache                None
BIOS                 AMI
Dimensions           254mm x 236mm
I/O Options          None
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J1       Reset switch                J4

  Turbo LED                   J2       Speaker                     J5

  Turbo switch                J3       Power LED & keylock         J6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select monochrome           JP2           pins 1 & 2
                                                              closed

  »   Monitor type select color                JP2           pins 2 & 3
                                                              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) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

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

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

                          CPU TYPE CONFIGURATION

        Type              JP3               JP4                JP5

      80486SX             Open           pins 2 & 3         pins 2 & 3
                                          closed              closed

      80487SX            Closed       pins 1 & 2, 3 &       pins 3 & 4
                                         4 closed             closed

      80486DX            Closed       pins 1 & 2, 3 &       pins 1 & 2
                                         4 closed             closed

      80486DX2           Closed       pins 1 & 2, 3 &       pins 1 & 2
                                         4 closed             closed

         CPU SPEED CONFIGURATION

  Speed      JP6        JP7       JP8

  16MHz     Closed    Closed    Closed

  20MHz      Open     Closed    Closed

  25MHz     Closed     Open     Closed

  33MHz     Closed    Closed     Open

  50iMHz    Closed     Open     Closed

  66iMHz    Closed    Closed     Open