
CSS LABORATORIES, INC.

PREFERRED 486 GA/VL ESP

Processor        80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  25/33/50(internal)50/66(internal)/66MHz
Chip Set         OPTI
Max. Onboard DRAM32/64MB
Cache            64/256/512KB
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

  Front panel connector      J39       Power LED & keylock        JP55

  IDE interface LED          J40       Turbo switch              JP101

  Turbo LED/reset            J41       Video to green              P1
  switch                               connector

  Speaker                    JP1       32-bit VESA Local bus   SL1 & SL2
                                       slots

                        USER CONFIGURABLE SETTINGS

               Function                  Jumper/Switch        Position

     Green PC password enabled               J57               Open

      Green PC password disabled              J57              Closed

     VESA bus clock select CPU               JP7              Closed
      speed & 1 clock

      VESA bus clock select CPU               JP7               Open
      speed

     Cache burst mode select                 JP9               Open
      2-1-1-1

      Cache burst mode select                 JP9              Closed
      3-2-2-2

     CPU type select                         JP11            Pins 2 & 3
      DX/DX2/Overdrive                                         closed

      CPU type select Overdrive               JP11            Pins 1 & 2
                                                               closed

     CPU type select non SX CPU              JP14              Open

      CPU type select SX CPU                  JP14            Pins 2 & 3
                                                               closed

     Video card address select               JP47              Open
      C000h-C7FFh disabled

      Video card address select               JP47             Closed
      C000h-C7FFh enabled

     Flash BIOS enabled                      JP52            Pins 1 & 2
                                                               closed

      Flash BIOS disabled                     JP52            Pins 2 & 3
                                                               closed

     Monitor type select color               JP56             Closed

      Monitor type select monochrome          JP56              Open

     Keyboard synchronous with CPU           JP70            Pins 2 & 3
                                                               closed

      Engineer test setting                   JP70            Pins 1 & 2
                                                               closed

     Factory configured - do not            SW1/7               Off
      alter.

     Factory configured - do not            SW1/8               Off
      alter

                        DRAM CONFIGURATION (30PIN)

          Size                    Bank 0                   Bank 1

           4MB                  (4) 1M x 9                  NONE

           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

  Note: This board was manufactured with either 8 banks of 30 pin SIMM
  sockets or 4 banks of 72 pin SIMM sockets. Mainboard drawing depicts 72
  pin SIMM sockets. If mainboard has 30 pin SIMM sockets, use the above
  table.

                        DRAM CONFIGURATION (72 PIN)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     2MB         (1) 512K x        NONE           NONE           NONE
                     36

     4MB         (1) 512K x      (1) 512K x       NONE           NONE
                     36             36

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

     6MB         (1) 512K x     (1) 1M x 36       NONE           NONE
                     36

     8MB        (1) 1M x 36     (1) 1M x 36       NONE           NONE

     8MB        (1) 2M x 36        NONE           NONE           NONE

     10MB        (1) 512K x     (1) 2M x 36       NONE           NONE
                     36

     12MB       (1) 1M x 36     (1) 2M x 36       NONE           NONE

     12MB        (1) 512K x      (1) 512K x    (1) 2M x 36       NONE
                     36             36

     14MB        (1) 512K x     (1) 1M x 36    (1) 2M x 36       NONE
                     36

     16MB       (1) 2M x 36     (1) 2M x 36       NONE           NONE

     16MB       (1) 4M x 36        NONE           NONE           NONE

     16MB       (1) 1M x 36     (1) 1M x 36    (1) 2M x 36       NONE

     18MB        (1) 512K x     (1) 2M x 36    (1) 2M x 36       NONE
                     36

     20MB        (1) 512K x      (1) 512K x    (1) 2M x 36   (1) 2M x 36
                     36             36

     20MB       (1) 1M x 36     (1) 2M x 36    (1) 2M x 36       NONE

     22MB        (1) 512K x     (1) 1M x 36    (1) 2M x 36   (1) 2M x 36
                     36

     24MB       (1) 1M x 36     (1) 1M x 36    (1) 2M x 36   (1) 2M x 36

     24MB       (1) 2M x 36     (1) 2M x 36    (1) 2M x 36       NONE

     24MB       (1) 1M x 36     (1) 1M x 36    (1) 4M x 36       NONE

     26MB        (1) 512K x     (1) 2M x 36    (1) 2M x 36   (1) 2M x 36
                     36

     28MB       (1) 1M x 36     (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

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

     32MB       (1) 8M x 36        NONE           NONE           NONE

     32MB       (1) 2M x 36     (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

     32MB       (1) 2M x 36     (1) 2M x 36    (1) 4M x 36       NONE

     40MB       (1) 1M x 36     (1) 1M x 36    (1) 4M x 36   (1) 4M x 36

     48MB       (1) 2M x 36     (1) 2M x 36    (1) 4M x 36   (1) 4M x 36

     48MB       (1) 4M x 36     (1) 4M x 36    (1) 4M x 36       NONE

     64MB       (1) 4M x 36     (1) 4M x 36    (1) 4M x 36   (1) 4M x 36

     64MB       (1) 4M x 36     (1) 4M x 36    (1) 8M x 36       NONE

  Note: This board was manufactured with either 8 banks of 30 pin SIMM
  sockets or 4 banks of 72 pin SIMM sockets. Mainboard drawing depicts 72
  pin SIMM sockets. If mainboard has 72 pin SIMM sockets, use the above
  table.

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

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

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

  Size    JP20    JP21   JP27   JP28   JP29    JP35   JP36   JP38   JP40

  64KB     1 &    1 &    1 &     1 &    2 &    2 &    2 &     1 &   2 & 3
           2       2      2      2      3       3      3      2

  256KB    1 &    2 &    2 &     2 &    2 &    2 &    2 &     1 &   2 & 3
           2       3      3      3      3       3      3      2

  512KB    2 &    2 &    2 &     2 &    1 &    1 &    1 &     2 &   1 & 2
           3       3      3      3      2       2      2      3

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP15              JP16               JP17

      80486SX             Open           Pins 2 & 3            Open
                                           closed

      80486DX            Closed          Pins 1 & 2           Closed
                                           closed

                      OVERDRIVE/80486SX CONFIGURATION

                  Type                                 JP12

           Both sockets enabled                       Open

              80486SX disabled                   Pins 1 & 2 closed

             Overdrive disabled                  Pins 2 & 3 closed

                          CPU SPEED CONFIGURATION

      Speed              JP8                JP19               JP50

      25MHz             Closed           Pins 1 & 2            N/A
                                           closed

      33MHz             Closed           Pins 1 & 2            N/A
                                           closed

      50iMHz             Open            Pins 2 & 3            N/A
                                           closed

      50MHz              N/A                N/A               Closed

      66iMHz             Open            Pins 2 & 3            N/A
                                           closed

      66MHz              N/A                N/A                Open

  VESA SYSTEM SPEED CONFIGURATION

    CPU speed            JP4

     < 33MHz             Open

     >= 33MHz           Closed

                          VESA WAIT STATE

     Setting           JP5              JP6             JP10

  0 wait states        Open             Open            Open

  1 wait state        Closed           Closed          Closed

                    GREEN PC IRQ DETECTION

   IRQ     SW1/1   SW1/2    SW1/3    SW1/4    SW1/5    SW1/6

  IRQ3      Off     Off       On      Off      Off      Off

  IRQ4      Off     Off      Off      Off       On      Off

  IRQ6      Off     Off      Off      Off      Off      On

  IRQ10     On      Off      Off      Off      Off      Off

  IRQ11     Off      On      Off      Off      Off      Off

  IRQ14     Off     Off      Off       On      Off      Off

                             IRQ CONFIGURATION

            IRQ                      SJ1                     SJ2

         IRQ5 & IRQ7         Pins 1 & 2 closed       Pins 1 & 2 closed

         IRQ12 & IRQ15        Pins 2 & 3 closed       Pins 2 & 3 closed

             EXTENDED READY SIGNAL CONFIGURATION

      CPU Speed              JP3                  JP45

   > 33mhz (RDY1)      Pins 2 & 3 closed         Closed

   < 25mhz (RDY2)      Pins 1 & 2 closed          Open

   FRONT PANEL PIN OUT CONFIGURATION

        Pin             Assignment

         1                Ground

         2               Power LED

         3            Hard drive LED

         4               Not used

         5                 Power

         6                Ground

         7               Turbo LED

         8           Keyboard inhibit

         9                 Power

         10            Reset switch

