ACHME COMPUTER, INC.

VLB 486CT1

Processor      80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor      20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set       OPTI
Max. Onboard   32MB
DRAM
Cache          64/128/256KB
BIOS           AMI
Dimensions     330mm x 218mm
I/O Options    32-bit VESA local bus slots (2)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  External keyboard            J2       Green PC                  JP38

  External battery             J4       32 Bit VESA slots        S1 & S2

                        USER CONFIGURABLE SETTINGS

                Function
                                             Jumper
                                                             Position

  »
      Monitor type select monochrome
                                              JP17
                                                               Open


      Monitor type select color
                                              JP17
                                                              Closed

  »
      Factory configured - do not
      alter
                                              JP18
                                                              Closed

  »
      Factory configured - do not
      alter
                                              JP22
                                                            pins 1 & 2
                                                              closed

  »
      Factory configured - do not
      alter
                                              JP23
                                                            pins 1 & 2
                                                              closed

  »
      Factory configured - do not
      alter
                                              JP26
                                                            pins 1 & 2
                                                              closed

  »
      Factory configured - do not
      alter
                                              JP37
                                                            pins 1 & 2
                                                              closed

                   PIN OUT CONFIGURATION

           Function                        J5

           Keylock                  pins 3 & 5 closed

          Power LED                 pins 1 & 2 closed

           Speaker             pins 7 , 8 , 9 & 10 closed

          Turbo LED                pins 12 & 13 closed

         Turbo switch            pins 15, 16 & 17 closed

         Reset switch              pins 19 & 20 closed

              DRAM CONFIGURATION

      Size
                    Bank 0
                                    Bank 3

      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

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

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

      16MB
                  (4) 4M x 9
                                     NONE

      17MB
                  (4) 256K x 9
                                  (4) 4M x 9

      17MB
                  (4) 4M x 9
                                 (4) 256K x 9

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

      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

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

    128KB      (4) 32K x 8      NONE           NONE

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

                        CACHE JUMPER CONFIGURATION

      Size
                        JP1
                                           JP6
                                                               JP7

      64KB
                     pins 1 & 2
                       closed
                                        pins 2 & 3
                                          closed
                                                        pins 2 & 3 closed

     128KB
                     pins 2 & 3
                       closed
                                        pins 1 & 2
                                          closed
                                                        pins 2 & 3 closed

     256KB
                     pins 4 & 5
                       closed
                                        pins 1 & 2
                                          closed
                                                        pins 1 & 2 closed

                          CPU TYPE CONFIGURATION

        Type               JP31              JP32              JP33

      80486SX           pins 3 & 4           Open        pins 2 & 3 , 4 &
                          closed                             5 closed

   80486SX (PQFP)          Open              Open           pins 1 & 2
                                                              closed

      80487SX         pins 2 & 3 , 4      pins 1 & 2     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

      80486DX         pins 2 & 3 , 4      pins 2 & 3     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

   80486DX (PQFP)       pins 1 & 2        pins 4 & 5        pins 1 & 2
                          closed            closed            closed

      ODP486SX        pins 2 & 3 , 4      pins 1 & 2     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

      80486DX2        pins 2 & 3 , 4      pins 2 & 3     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

  Pentium Overdrive   pins 2 & 3 , 4      pins 1 & 2     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

                          CPU SPEED CONFIGURATION

  Speed
             OSC.
                          JP8
                                        JP12
                                                     JP13
                                                                  JP14

  20MHz
             40MHz
                       pins 2 & 3
                         closed
                                       Closed
                                                    Closed
                                                                  Open

  25MHz
             25MHz
                       pins 2 & 3
                         closed
                                        Open
                                                     Open
                                                                 Closed

  33MHz
             33MHz
                       pins 1 & 2
                         closed
                                       Closed
                                                     Open
                                                                  Open

  50i MHz
             25MHz
                       pins 2 & 3
                         closed
                                        Open
                                                     Open
                                                                 Closed

  50MHz
             50MHz
                       pins 1 & 2
                         closed
                                        Open
                                                    Closed
                                                                  Open

  66i MHz
             33MHz
                       pins 1 & 2
                         closed
                                       Closed
                                                     Open
                                                                  Open

              VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed      Wait states          JP19            JP20

     <=33MHz      0 wait states         Open            Open

      >33MHz       1 wait state        Closed          Closed