
I-BUS

BARRACUDA

Processor  CX486SX/80486SX/80486SX2/CX486DX/AM486DX/SL80486DX/80486DX/
           CX486DX2/AM486DX2/SL80486DX2/80486DX2/80486DX4/P24D/Pentium
           Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   OPTI
Max.       128MB
Onboard
DRAM
Cache      64/128/256/512KB
BIOS       Unidentified
Dimensions 300mm x 89mm
I/O        Floppy drive interface, IDE interface, parallel port, PS/2 mouse
Options    port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  IDE interface              J3        Serial port 1              J30

  Parallel port              J4        Serial port 2              J31

  Speaker                    J6        Auxiliary keyboard         J32
                                       connector

  Chassis fan power          J8        Floppy drive               J33
                                       interface

  IDE interface LED          J25       PS/2 mouse interface       J35

  Reset switch               J26

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

      PCI type select synchronous              J9         pins 2 & 4, 3 &
                                                             5 closed

      PCI type select asynchronous             J9         pins 1 & 3, 4 &
                                                             6 closed

     Primary IDE enabled                     J14           pins 1 & 3
                                                              closed

      Primary IDE disabled                    J14        pins 1 & 3 open

      Secondary IDE enabled                   J14           pins 3 & 5
                                                              closed

      Secondary IDE disabled                  J14        pins 3 & 5 open

     IDE interface enabled                   J14           pins 2 & 4
                                                              closed

      IDE interface disabled                  J14           pins 4 & 6
                                                              closed

     Floppy drive type select 1.44MB         J17           pins 1 & 2
                                                              closed

      Floppy drive type select 2.88MB         J17         pins 3 & 4, 5 &
                                                             6 closed

     CPU clock frequency select 8MHz         J19           pins 1 & 2
                                                              closed

      CPU clock frequency select 16MHz        J19           pins 2 & 3
      (DX4 only)                                              closed

      PCI adapters not installed              J20           pins 1 & 2
                                                              closed

      PCI adapters installed                  J20           pins 2 & 3
                                                              closed

      IDE read prefetch enabled               J22           pins 1 & 2
                                                              closed

      IDE read prefetch disabled              J22           pins 2 & 3
                                                              closed

     Battery type select internal            J24           pins 2 & 3
                                                              closed

      CMOS memory clear                       J24           pins 1 & 2
                                                              closed

     Mouse IRQ12 enabled                     J27             Closed

      Mouse IRQ12 disabled                    J27              Open

     IDE IRQ14 enabled                       J28             Closed

      IDE IRQ14 disabled                      J28              Open

     Factory configured - do not alter       J29              N/A

      Password enabled                        J36             Closed

      Password disabled                       J36              Open

                            DRAM CONFIGURATION

     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

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

     8MB         (1) 512K x    (1) 512K x     (1) 512K x    (1) 512K x 36
                    36             36             36

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

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

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

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

     14MB       (1) 2M x 36    (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

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

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

     16MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     18MB       (1) 4M x 36    (1) 512K x        NONE           NONE
                                   36

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

     20MB       (1) 4M x 36   (1) 1M x 36        NONE           NONE

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1        Bank 2          Bank 3

     20MB       (1) 1M x 36    (1) 4M x 36       NONE            NONE

     22MB       (1) 4M x 36     (1) 512K x     (1) 512K x     (1) 512K x
                                    36            36              36

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

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

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

     28MB       (1) 4M x 36    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

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

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

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

     34MB       (1) 8M x 36     (1) 512K x       NONE            NONE
                                    36

     34MB        (1) 512K x    (1) 8M x 36       NONE            NONE
                     36

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

     38MB       (1) 8M x 36     (1) 512K x     (1) 512K x     (1) 512K x
                                    36            36              36

     40MB       (1) 8M x 36    (1) 2M x 36       NONE            NONE

     40MB       (1) 2M x 36    (1) 8M x 36       NONE            NONE

     48MB       (1) 8M x 36    (1) 2M x 36    (1) 2M x 36        NONE

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

     52MB       (1) 1M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

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

     66MB        (1) 512K x    (1) 8M x 36    (1) 8M x 36        NONE
                     36

     72MB       (1) 2M x 36    (1) 8M x 36    (1) 8M x 36        NONE

     96MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36        NONE

     98MB        (1) 512K x    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36
                     36

     104MB      (1) 2M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

     128MB      (1) 8M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

                            CACHE CONFIGURATION

          Size                    Bank 0                   Bank 1

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

          128KB                (4) 32K x 8                  NONE

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

          512KB                (4) 64K x 8              (4) 64K x 8

  Note: Cache is factory installed by the manufacturer and is not
  configurable.

                      CACHE JUMPER CONFIGURATION

               Size                               J15

               64KB                               Open

               128KB                       pins 5 & 6 closed

               256KB                    pins 3 & 4, 5 & 6 closed

               512KB                pins 1 & 2, 3 & 4, 5 & 6 closed

            CACHE JUMPER CONFIGURATION

         Setting                   J21

    Bank 0 installed        pins 1 & 2 closed

  Banks 0 & 1 installed     pins 2 & 3 closed

                 CPU TYPE CONFIGURATION

            Type                        J5

          80486SX                pins 2 & 3 closed

          80486DX            pins 1 & 2, 3 & 4 closed

                          CPU TYPE CONFIGURATION

         Type                     J7                        J23

          AMD                    Open                pins 1 & 2 closed

         Cyrix             pins 1 & 2, 3 & 4         pins 2 & 3 closed
                                closed

         Intel                   Open                pins 1 & 2 closed

                 CPU TYPE CONFIGURATION

            Type                        J1

       80486SL-series        pins 1 & 2, 3 & 4 closed

      P24T burst write           pins 5 & 6 closed

      P24T write back            pins 7 & 8 closed

     P24T write through                Open

           CPU TYPE CONFIGURATION

         Type                  J18

    80486SL-series      pins 2 & 4 closed

        Cyrix           pins 4 & 6 closed

   P24D write back      pins 3 & 5 closed

  P24D write through    pins 1 & 3 closed

                          CPU TYPE CONFIGURATION

                 Type                                  J11

   Any CPU type installed except for            pins 1 & 3 closed
                 P24T

          Pentium Overdrive                     pins 3 & 5 closed

         Bit 0 to stop clock                    pins 2 & 4 closed

         Bit 0 to stop clock                    pins 4 & 6 closed

                          CPU SPEED CONFIGURATION

          Speed                    J12                      J16

          25MHz              pins 1 & 3, 2 & 4       pins 5 & 6 closed
                                  closed

          33MHz              pins 1 & 3, 4 & 6        pins 1 & 2, 5 & 6
                                  closed                   closed

          40MHz              pins 2 & 4, 3 & 5        pins 3 & 4, 5 & 6
                                  closed                   closed

         50iMHz              pins 1 & 3, 2 & 4       pins 5 & 6 closed
                                  closed

          50MHz              pins 4 & 6, 3 & 5     pins 1 & 2, 3 & 4, 5 &
                                  closed                  6 closed

         66iMHz              pins 1 & 3, 4 & 6        pins 1 & 2, 5 & 6
                                  closed                   closed

         75iMHz              pins 1 & 3, 2 & 4       pins 5 & 6 closed
                                  closed

         100iMHz             pins 1 & 3, 4 & 6        pins 1 & 2, 5 & 6
                                  closed                   closed

      CPU SPEED CONFIGURATION (80486DX4)

         Speed                  J10

          2x             pins 3 & 5 closed

         2.5x            pins 1 & 3 closed

          3x                    Open

  Cyrix CPU installed    pins 3 & 4 closed

                 IDE MODE CONFIGURATION

           Speed                        J13

           >180ns            pins 1 & 3, 2 & 4 closed

           >240ns            pins 2 & 4, 3 & 5 closed

           >383ns            pins 1 & 3, 4 & 6 closed

           >480ns            pins 3 & 5, 4 & 6 closed

                   DMA CONFIGURATION

            DMA                         J2

           DMA 1             pins 3 & 4, 5 & 6 closed

           DMA 3             pins 1 & 2, 7 & 8 closed

