
FIRST INTERNATIONAL COMPUTER, INC.

LEO 486-PSD-10

Processor     80486SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor     25/33/40/50(internal)/66(internal)/100(internal)MHz
Speed
Chip Set      INTEL
Max. Onboard  128MB
DRAM
Cache         64/256KB
BIOS          AMI
Dimensions    330mm x 218mm
I/O Options   Floppy drive interface, IDE interface,mouse connector,
              parallel port,

              P/S2 mouse connector, serial ports (2), VGA connector
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                  Location

  Bus mouse connector      CN1        IDE LED                    J11

  P/S2 mouse               CN4        Green power supply         J16
  connector                           connector

  Floppy drive             CN6        Turbo switch               J29
  interface

  IDE connector            CN7        Turbo LED                  J30

  Serial port 1            CN8        Reset switch               J31

  Serial port 2            CN9        Speaker                    J32

  Parallel port            CN10       Power LED & keylock        J33

  SCSI connector           CN11       PCI slots               PCI 1, 2, &
                                                                  3

  SCSI busy LED             J7        3.3V daughter board        PS3V
                                      (80486DX4)

                        USER CONFIGURABLE SETTINGS

                  Function                      Jumper        Position

     CPU generate parity                         J4         pins 1 & 2
                                                               closed

      DPU generate parity                         J4         pins 2 & 3
                                                               closed

     Do not force parity error                   J5         pins 1 & 2
                                                               closed

      Force parity error                          J5         pins 2 & 3
                                                               closed

     SCSI enable                                 J6           closed

      SCSI disable                                J6            open

     SCSI power source from peripheral           J8            open
      device

      SCSI power source from system               J8           closed

      IDE connector pin 27 linked to              J9           closed
      IOCHRDY signal

      IDE connector pin 27 open                   J9            open

      IDE connector pin 28 linked to BALE        J10           closed
      signal

      IDE connector pin 28 open                  J10            open

     Normal operation                           J17            Open

      Clear password                             J17           closed

     Saturn B-step chip                         J23         pins 1 & 2
                                                               closed

      Saturn II/II-50                            J23         pins 2 & 3
                                                               closed

     Cache set at 256K                          J24         pins 2 & 3
                                                               closed

      Cache set at 64K                           J24         pins 1 & 2
                                                               closed

      Level 2 write-back cache                   J25         pins 1 & 2
                                                               closed

      Level 2 write-through cache                J25         pins 2 & 3
                                                               closed

     80486DX4 2.5X mode                         J26         pins 2 & 3
                                                               closed

      80486DX4 2X mode                           J26         pins 1 & 2
                                                               closed

      80486DX4 3X mode                           J26            open

     Pentium Overdrive internal                 J27         pins 1 & 2
      write-back cache                                         closed

      Pentium Overdrive internal                 J27         pins 2 & 3
      write-through cache                                      closed

     No cache wait state                        JF3         pins 2 & 3
                                                               closed

      One cache wait state                       JF3         pins 1 & 2
                                                               closed

      Saturn II/II-50 chipset with               JF9         pins 2 & 3
      SL-enhan/DX4/Pentium overdrive                           closed

      Saturn II/II-50 chipset with other         JF9         pins 1 & 2
      CPUs                                                     closed

      Saturn II/II-50 chipset for Saturn         JF9            open
      B-step chipset use

     PCI SCSI IRQ at IRQ9                       JN1         pins 1 & 2
                                                               closed

      PCI SCSI IRQ at IRQ11                      JN1         pins 2 & 3
                                                               closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     2MB        (1) 256K x     (1) 256K x        NONE           NONE
                    36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

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

     10MB      (1) 1M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

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

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

     34MB      (1) 4M x 36    (1) 4M x 36    (1) 1M x 36    (1) 256K x 36

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

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

     64MB      (1) 16M x 36   (1) 16M x 36       NONE           NONE

                      DRAM CONFIGURATION (CONTINUED)

     Size          Bank 0        Bank 1        Bank 2          Bank 3

     66MB         (1) 16M x     (1) 16M x     (1) 256K x    (1) 256K x 36
                     36            36            36

     72MB         (1) 16M x     (1) 16M x    (1) 1M x 36     (1) 1M x 36
                     36            36

     96MB         (1) 16M x     (1) 16M x    (1) 16M x 36   (1) 16M x 36
                     36            36

     128MB        (1) 16M x     (1) 16M x    (1) 16M x 36   (1) 16M x 36
                     36            36

  Note:A {(1) 32M x 36} is a double RAS SIMM.

                            CACHE CONFIGURATION

       Size             Data RAM           TAG RAM       U32 (dirty bit)

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

       256KB          (8) 32K x 8        (1) 32K x 8         64K x 1

               CACHE JUMPER CONFIGURATION

  Size       J14         J15         J18         J19

  64KB      Open         Open        Open        Open

  256KB    Closed       Closed      Closed      Closed

                      CACHE INTERLEAVE CONFIGURATION

        Type                J20              J21               J22

     Interleave          pins 2 & 3       pins 1 & 2        pins 1 & 2
                          closed            closed            closed

      Standard           pins 1 & 2       pins 2 & 3        pins 2 & 3
                          closed            closed            closed

  Note:Interleave setting is for the Saturn II-50 chipset only.

                    CPU TYPE CONFIGURATION

        Type                 JC1                JC2, JC3

       80486SX               Open              pins 2 & 3

       80486DX               Open              pins 1 & 2

      80486DX2               Open              pins 1 & 2

      80486DX4               Open              pins 1 & 2

  Pentium Overdrive         Closed             pins 1 & 2

          CPU TYPE CONFIGURATION (CONTINUED)

     Type       JC4, J12         JC5          JC6

  80486SX 1      Closed         Open       pins 1 & 2

  80486SX 2      Closed         Open       pins 1 & 2

  80486DX 1      Closed         Open       pins 1 & 2

  80486DX 2      Closed         Open       pins 1 & 2

  80486DX2 1     Closed         Open       pins 1 & 2

  80486DX2 2     Closed         Open       pins 1 & 2

  80486DX4 1     Closed         Open       pins 1 & 2

  80486DX4 2     Closed        Closed      pins 2 & 3

                    CPU TYPE CONFIGURATION (CONTINUED)

         Type              JC4, J12            JC5              JC6

    SL enhanced 1           Closed            open           pins 1 & 2

    SL enhanced 2           Closed           closed          pins 2 & 3

  Pentium Overdrive 1        Open             open           pins 1 & 2

  Pentium Overdrive 2        Open            closed          pins 2 & 3

  Note: 1 denotes Saturn B-step chipset used with CPU.

  2 denotes Saturn II/II-50 chipset used with CPU.

              CPU CLOCK (VT8225N) CONFIGURATION

        Speed                JK1                  JK2

     CLK2 50 Mhz       pins 1 & 2 closed   pins 2 & 3 closed

    CLK2 66.6 Mhz      pins 2 & 3 closed    pins 1 & 2 open

            CPU SPEED CONFIGURATION

     Speed            JF6            JF7

    Reserved      pins 2 & 3      pins 1 & 2

     25MHz        pins 1 & 2      pins 1 & 2

     33Mhz        pins 1 & 2      pins 2 & 3

     50iMHz       pins 1 & 2      pins 1 & 2

    50iMHz 1      pins 2 & 3      pins 2 & 3

     66iMHz       pins 1 & 2      pins 2 & 3

  Note: 1 denotes Saturn II-50 chipset only.

                      PCI1 IRQ SELECTION

       Jumper                IRQ                Setting

         JI1                 IRQ5          pins 1 & 2 closed

         JI2                 IRQ9          pins 1 & 2 closed

         JI3                IRQ10          pins 1 & 2 closed

         JI4                IRQ11          pins 1 & 2 closed

         JI5                IRQ12          pins 1 & 2 closed

         JI6                IRQ14          pins 1 & 2 closed

         JI7                IRQ15          pins 1 & 2 closed

                  PCI2 & PCI3 IRQ SELECTION

       Jumper                IRQ                Setting

         JI1                 IRQ5          pins 2 & 3 closed

         JI2                 IRQ9          pins 2 & 3 closed

         JI3                IRQ10          pins 2 & 3 closed

         JI4                IRQ11          pins 2 & 3 closed

         JI5                IRQ12          pins 2 & 3 closed

         JI6                IRQ14          pins 2 & 3 closed

         JI7                IRQ15          pins 2 & 3 closed

                  TAG ADDRESS CONFIGURATION

       Address               JF1                  JF2

        8-bit          pins 1 & 2 closed   pins 1 & 2 closed

        7-bit          pins 1 & 2 closed   pins 2 & 3 closed

        9-bit          pins 2 & 3 closed   pins 1 & 2 closed

      Reserved         pins 2 & 3 closed   pins 2 & 3 closed

                       MISCELLANEOUS TECHNICAL NOTE

  Note:1. When using the PCI1 slot on the mainboard, jumper choice should
  only be limited to pins 1 & 2 of jumpers JI1 to JI7

  2. When using PCI2 or PCI3 slots on the mainboard, jumper choice should
  only be limited to pins

  2 & 3 of jumpers JI1 to JI7.

  3. When using the Saturn B-step chipset, PCI1 slot serves as the master
  slot while PCI2 and PCI

  3 slots serve as slave slots.

  4. When using the Saturn II/II-50 chipset, PCI1, PCI2, PCI3 slots can
  serve both as master or

  slave slot.

