
GENOA SYSTEMS CORPORATION

486F55

Processor  CX486S/AM486SX/80486SX/CX486S2/AM486SX2/80486SX2/
           ODP487/80487SX/CX486DX/80486DX/CX486DX2/AM486DX2/
           (SL)AM486DX2(WB)/(SL)AM486DX2(WT)/80486DX2/AM486DX4/
           (SL)AM486DX4(WB)/(SL)AM486DX4(WT)/80486DX4/P24D/P24CT/
           P24C(WB)/P24T/CX5X86
Processor  25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   SIS
Video Chip None
Set
Maximum    256MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      128/256/512KB
BIOS       Award
Dimensions 254mm x 218mm
I/O        32-bit PCI slots (3), floppy drive interface, green PC
Options    connector, IDE interfaces (2), parallel port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port                CN1       Turbo switch                J2

  Serial port                CN2       Green PC connector          J3

  Parallel port              CN3       Turbo LED                   J4

  Floppy drive interface     CN4       Reset switch                J5

  IDE interface 2            CN5       Power LED & keylock         J6

  IDE interface 1            CN6       Speaker                     J7

  IDE interface LED           J1       32-bit PCI slots         PC1 - PC3

                        USER CONFIGURABLE SETTINGS

                Function                     Label          Position

     CMOS memory normal operation            JP2       Pins 1 & 2 closed

      CMOS memory clear                       JP2       Pins 2 & 3 closed

     Parallel port IRQ select IRQ7           JP6       Pins 1 & 2 closed

      Parallel port IRQ select IRQ5           JP6       Pins 2 & 3 closed

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

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

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

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

     4MB            None        (1) 512K x     (1) 256K x   (1) 256K x 36
                                   36             36

     7MB        (1) 1M x 36     (1) 256K x     (1) 256K x   (1) 256K x 36
                                   36             36

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

     13MB        (1) 256K x    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36
                     36

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

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

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

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

     19MB       (1) 4M x 36     (1) 256K x     (1) 256K x   (1) 256K x 36
                                   36             36

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

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

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

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

     49MB        (1) 256K x    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36
                     36

     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

     64MB           None       (1) 8M x 36       None        (1) 8M x 36

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

     67MB       (1) 16M x 36    (1) 256K x     (1) 256K x   (1) 256K x 36
                                   36             36

     76MB       (1) 16M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

    112MB       (1) 16M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     130MB          None         (1) 512K x       None       (1) 32M x 36
                                    36

     136MB          None        (1) 32M x 36      None       (1) 2M x 36

     136MB          None        (1) 2M x 36       None       (1) 32M x 36

     136MB       (1) 1M x 36    (1) 1M x 36       None       (1) 32M x 36

     160MB       (1) 16M x 36   (1) 16M x 36      None       (1) 8M x 36

     160MB          None        (1) 8M x 36       None       (1) 32M x 36

     160MB          None        (1) 32M x 36      None       (1) 8M x 36

     160MB          None        (1) 8M x 36       None       (1) 32M x 36

     160MB       (1) 4M x 36    (1) 4M x 36       None       (1) 32M x 36

     193MB        (1) 256K x    (1) 16M x 36    (1) 16M x    (1) 16M x 36
                     36                            36

     196MB       (1) 1M x 36    (1) 16M x 36    (1) 16M x    (1) 16M x 36
                                                   36

     208MB       (1) 4M x 36    (1) 16M x 36    (1) 16M x    (1) 16M x 36
                                                   36

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

     256MB       (1) 16M x 36   (1) 16M x 36      None       (1) 32M x 36

     256MB          None        (1) 32M x 36      None       (1) 32M x 36

     256MB          None        (1) 32M x 36    (1) 16M x    (1) 16M x 36
                                                   36

                            CACHE CONFIGURATION

       Size             Bank 0           Bank 1               TAG

      128KB          (4) 32K x 8          None        (1) 8K/16K/32K x 8

    256KB (A)        (4) 64K x 8          None          (1) 16K/32K x 8

    256KB (B)        (4) 32K x 8       (4) 32K x 8      (1) 16K/32K x 8

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

                        CACHE JUMPER CONFIGURATION

      Size              JP15               JP16               JP20

      128KB           Pins 1 & 2        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

    256KB (A)         Pins 1 & 2        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

    256KB (B)         Pins 1 & 2        Pins 2 & 3      Pins 1 & 2 closed
                       closed             closed

      512KB           Pins 2 & 3        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

      CPU SPEED SELECTION

   Speed      JP22      JP23

   25MHz      Open      Open

   33MHz     Closed    Closed

   40MHz      Open     Closed

  50iMHz      Open      Open

  66iMHz     Closed    Closed

  75iMHz      Open      Open

  100iMHz    Closed    Closed

                            CPU TYPE SELECTION

         Type              JP8         JP9         JP10          JP11

        CX486S            Open       1 & 2, 5    2 & 3, 5 &    1 & 2, 4 &
                                       & 6       6, 7 & 8      5, 6 & 7

       AM486SX            Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

       80486SX            Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

       CX486S2            Open       1 & 2, 5    2 & 3, 5 &    4 & 5, 6 &
                                       & 6       6, 7 & 8          7

       AM486SX2           Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

       80486SX2           Open       1 & 2, 4    2 & 3, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

        ODP487            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       80487SX            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       CX486DX            Open       1 & 2, 5    1 & 2, 5 &    4 & 5, 6 &
                                       & 6       6, 7 & 8          7

       80486DX            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       CX486DX2           Open       1 & 2, 5    1 & 2, 5 &    4 & 5, 6 &
                                       & 6       6, 7 & 8          7

       AM486DX2           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

  (SL)AM486DX2 (WB)       2 & 3      2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX2 (WT)       2 & 3      2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       80486DX2           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       AM486DX4           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX4 (WB)       Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

  (SL)AM486DX4 (WT)       Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

       80486DX4           Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

         P24D             Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

        P24CT             Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

      P24C (WB)           Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7          6

         P24T             Open       2 & 3, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

        CX5X86            Open       1 & 2, 4    1 & 2, 4 &    3 & 4, 5 &
                                       & 5       5, 6 & 7      6, 7 & 8

  Note: Pins designated should be in the closed position.

                           CPU VOLTAGE SELECTION

       Voltage             JP17              JP18              JP19

          3.3v             Open              Open              Open

          3.6v            Closed             Open              Open

          5v              Open             Closed            Closed

                           DMA CHANNEL SELECTION

         Channel                   JP4                      JP5

             1             Pins 1 & 2 closed        Pins 1 & 2 closed

              3             Pins 2 & 3 closed        Pins 2 & 3 closed

