
SPRING CIRCLE COMPUTER, INC.

ST586 REV. P550 PCI MB

Processor             CX M1/Pentium
Processor Speed       75/90/100/120/133/150/166MHz
Chip Set              Intel
Video Chip Set        None
Maximum Onboard       128MB (EDO supported)
Memory
Maximum Video Memory  None
Cache                 256/512KB
BIOS                  AMI/Award
Dimensions            280mm x 220mm
I/O Options           32-bit PCI slots (4), floppy drive interface, green
                      PC connector, IDE interfaces (2), parallel port,
                      serial ports (2), cache slot, VRM connector
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  Serial port 2             J1         Turbo LED             J11 pins 2 &
                                                                  3

  Serial port 1             J2         Green PC connector    J11 pins 4 &
                                                                  5

  Floppy drive              J3         Turbo switch          J11 pins 6 &
  interface                                                       7

  Parallel port             J4         Reset switch          J11 pins 9 &
                                                                 10

  IDE interface 2           J5         Power LED &          J11 pins 11 -
                                       keylock                   15

  IDE interface 1           J6         Speaker              J11 pins 17 -
                                                                 20

  VRM connector             J8         32-bit PCI slots       PC1 - PC4

  External battery          J9         Cache slot                SL1

  IDE interface LED         J10

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

      Jumper information unavailable        J12          Unidentified

     Flash BIOS voltage select 5v          JP4        Pins 1 & 2 closed

      Flash BIOS voltage select 12v         JP4        Pins 2 & 3 closed

     CMOS memory normal operation          JP5              Open

      CMOS memory clear                     JP5             Closed

     Parallel port IRQ select IRQ7         JR1        Pins 1 & 2 closed

      Parallel port IRQ select IRQ5         JR1        Pins 2 & 3 closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      8MB         (2) 1M x 36        None

      16MB        (2) 2M x 36        None

      16MB        (2) 1M x 36    (2) 1M x 36

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

      32MB        (2) 4M x 36        None

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

      40MB        (2) 1M x 36    (2) 4M x 36

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

      64MB        (2) 8M x 36        None

      64MB        (2) 4M x 36    (2) 4M x 36

      72MB        (2) 1M x 36    (2) 8M x 36

      80MB        (2) 2M x 36    (2) 8M x 36

      96MB        (2) 4M x 36    (2) 8M x 36

     128MB        (2) 8M x 36    (2) 8M x 36

     128MB        (2) 16M x 36       None

                            CACHE CONFIGURATION

       Size            Bank 0            TAG                 SL1

    256KB (A)       (8) 32K x 8      (1) 8K x 8         Not installed

    256KB (B)           None         (1) 8K x 8          256KB module
                                                          installed

    512KB (A)       (8) 64K x 8      (1) 32K x 8        Not installed

    512KB (B)           None         (1) 32K x 8         512KB module
                                                          installed

                        CACHE JUMPER CONFIGURATION

         Size                     JP7                       JP9

         None              Pins 1 & 2 closed         Pins 1 & 2, 4 & 5
                                                          closed

       256KB (A)           Pins 2 & 3 closed         Pins 1 & 2, 5 & 6
                                                          closed

       256KB (B)                 Open                      Open

       512KB (A)           Pins 1 & 2 closed         Pins 2 & 3, 4 & 5
                                                          closed

       512KB (B)                 Open                      Open

                        CACHE VOLTAGE CONFIGURATION

                 Size                                  JP6

                    3.3v                        Pins 2 & 3 closed

                 5v mixed                      Pins 1 & 2 closed

                        CPU SPEED SELECTION (CYRIX)

    Speed         JP1            JP2            JP3             JP8

   120MHz      Pins 2 & 3     Pins 2 & 3     Pins 1 & 2     Pins 1 & 2, 5
                 closed         closed         closed        & 6 closed

   150MHz      Pins 2 & 3     Pins 1 & 2     Pins 2 & 3     Pins 1 & 2, 5
                 closed         closed         closed        & 6 closed

   166MHz      Pins 1 & 2     Pins 2 & 3     Pins 2 & 3     Pins 1 & 2, 5
                 closed         closed         closed        & 6 closed

                        CPU SPEED SELECTION (INTEL)

    Speed         JP1            JP2            JP3             JP8

    75MHz      Pins 2 & 3     Pins 2 & 3     Pins 1 & 2     Pins 1 & 2, 4
                 closed         closed         closed        & 5 closed

    90MHz      Pins 2 & 3     Pins 1 & 2     Pins 2 & 3     Pins 1 & 2, 4
                 closed         closed         closed        & 5 closed

   100MHz      Pins 1 & 2     Pins 2 & 3     Pins 2 & 3     Pins 1 & 2, 4
                 closed         closed         closed        & 5 closed

   120MHz      Pins 2 & 3     Pins 1 & 2     Pins 2 & 3     Pins 1 & 2, 5
                 closed         closed         closed        & 6 closed

   133MHz      Pins 1 & 2     Pins 2 & 3     Pins 2 & 3     Pins 1 & 2, 5
                 closed         closed         closed        & 6 closed

   150MHz      Pins 2 & 3     Pins 1 & 2     Pins 2 & 3     Pins 2 & 3, 5
                 closed         closed         closed        & 6 closed

   166MHz      Pins 1 & 2     Pins 2 & 3     Pins 2 & 3     Pins 2 & 3, 5
                 closed         closed         closed        & 6 closed

                           CPU VOLTAGE SELECTION

               Voltage                                JP10

                   3.3v                         Pins 1 & 2 closed

                  3.4v                         Pins 2 & 3 closed

                   3.5v                         Pins 4 & 5 closed

                           CPU VOLTAGE SELECTION

               Setting                                 J8

         Regular CPU voltage            Pins 4 & 5, 6 & 7, 19 & 20, 21 &
                                                   22 closed

     VRM module for CPU voltage                       Open

                           DMA CHANNEL SELECTION

               Channel                                JR2

                   1                       Pins 1 & 2, 4 & 5 closed

                    3                       Pins 2 & 3, 5 & 6 closed

