
AAEON TECHNOLOGY, INC.

SBC-490

 Device Type                   Mainboard

 Processor                     80486SX/SL80486SX/80486DX/SL80486DX/CX486DX2/SGS486DX2/ TI486DX2/
                               IBM486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/(SL)AM486DX4/
                               SL80486DX4/ P24D/CXMISC/CX 5X86/IBM 5X86/SGS 5X86/AM X5

 Processor Speed               25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz

 Chip Set                      ALI 1489

 Video Chip Set                Trident

 Maximum Onboard Memory        128MB (EDO supported)

 Maximum Video Memory          2MB

 Cache                         128/256/512KB

 BIOS                          Award

 Dimensions                    338mm x 122mm

 I/O Options                   Floppy drive interface, green PC connector, IDE interfaces (2),
                               parallel port, PS/2 mouse port, serial ports (2), VGA feature
                               connector, VGA port, IR connector, PC/104connectors (2)

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Power LED & keylock        C1        Auxiliary keyboard         CN5
                                       connector

  Speaker                    C2        PC/104 connector           CN6

  Reset switch               C3        PC/104 connector           CN7

  Green PC connector         C4        IDE interface 2            CN8

  Green PC connector         C5        IDE interface 1            CN9

  Turbo LED                  C6        Floppy drive              CN10
                                       interface

  Turbo switch               C7        Parallel port             CN11

  CPU fan power              C8        VGA feature               CN12
                                       connector

  Power connector            CN1       Serial port 2             CN13

  Serial port 1              CN2       IDE interface LED          JP2

  VGA port                   CN3       IDE interface LED          JP3

  PS/2 mouse port            CN4       IR connector              JP17

                         USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Flash BIOS write protect enabled         JP11            Closed

     Flash BIOS write protect disabled        JP11             Open

    CMOS memory normal operation             JP15             Open

     CMOS memory clear                        JP15            Closed

                            SIMM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

     3MB         (1) 256K x    (1) 256K x     (1) 256K x        None
                    36             36             36

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

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

     5MB        (1) 1M x 36    (1) 256K x        None           None
                                   36

     6MB        (1) 1M x 36    (1) 256K x     (1) 256K x        None
                                   36             36

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

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

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

     9MB        (1) 2M x 36    (1) 256K x        None           None
                                   36

     10MB       (1) 2M x 36    (1) 256K x     (1) 256K x        None
                                   36             36

     11MB       (1) 2M x 36    (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

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

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

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

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

                        SIMM CONFIGURATION (CON'T)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     17MB        (1) 4M x 36    (1) 256K x        None           None
                                    36

     18MB        (1) 4M x 36    (1) 256K x     (1) 256K x        None
                                    36             36

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

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

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

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

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

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

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

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

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

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

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

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

     48MB        (1) 8M x 36   (1) 4M x 36        None           None

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

     56MB        (1) 8M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

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

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

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

     80MB        (1) 8M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

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

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

             CACHE CONFIGURATION

      Size         Bank 0          TAG

     128KB       (4) 32K x 8   (1) 32K x 8

     256KB       (4) 64K x 8   (1) 32K x 8

     512KB       (4) 128K x    (1) 32K x 8
                      8

               CACHE JUMPER CONFIGURATION

            Size                       JP12

           128KB                       Open

           256KB                 Pins 1 & 2 closed

           512KB             Pins 1 & 2, 3 & 4 closed

           VIDEO MEMORY CONFIGURATION

      Size           Bank 0         Bank 1

       1MB         (2) 256K x        None
                       16

       2MB         (2) 256K x     (2) 256K x
                       16             16

                            CPU SPEED SELECTION

          Speed                    JP13                     JP14

          25MHz                    Open              Pins 1 & 2 closed

          33MHz              Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

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

         50iMHz                    Open              Pins 1 & 2 closed

          50MHz              Pins 1 & 2, 5 & 6       Pins 2 & 3 closed
                                  closed

         66iMHz              Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

         75iMHz                    Open              Pins 1 & 2 closed

         100iMHz             Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

                             CPU TYPE SELECTION

          Type                                  JP8

         80486SX                  1 & 2, 19 & 20, 23 & 24, 25 & 26

        SL80486SX          1 & 4, 2 & 5, 7 & 10, 8 & 9, 14 & 17, 15 & 18,
                                     19 & 20, 22 & 23, 26 & 27

         80486DX             1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26

        CX486DX2           1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21,
                                          22 & 23, 25 & 26

        SGS486DX2          1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21,
                                          22 & 23, 25 & 26

        TI486DX2           1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21,
                                          22 & 23, 25 & 26

        IBM486DX2          1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & 21,
                                          22 & 23, 25 & 26

        80486DX2             1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26

        AM486DX4           1 & 2, 3 & 6, 13 & 16, 18 & 21, 19 & 20, 22 &
                                            23, 25 & 26

      (SL)AM486DX4        1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21,
                                     19 & 20, 22 & 23, 26 & 27

          P24D            1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21,
                                     19 & 20, 22 & 23, 26 & 27

          P24T             1 & 4, 2 & 5, 7 & 10, 8 & 9, 14 & 17, 15 & 18,
                                     19 & 20, 22 & 23, 26 & 27

         CX 5X86          1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21,
                                     19 & 20, 22 & 23, 25 & 26

        IBM 5X86          1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21,
                                     19 & 20, 22 & 23, 25 & 26

        SGS 5X86          1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21,
                                     19 & 20, 22 & 23, 25 & 26

         CX MISC          1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & 21,
                                     19 & 20, 23 & 24, 25 & 26

      AM X5-133/150         1 & 4, 2 & 5, 8 & 9, 10 & 11, 13, & 16, 14 &
                               17, 18 & 21, 19 & 20, 22 & 23, 26 & 27

        AM X5-160            1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26

         AM DE2              1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26

  Note: Pins designated should be in the closed position.

                           CPU VOLTAGE SELECTION

         Voltage                   JP1                      JP7

          3.3v               Pins 1 & 3, 2 & 4       Pins 1 & 3 closed
                                  closed

          3.45v              Pins 1 & 3, 2 & 4       Pins 4 & 6 closed
                                  closed

          3.6v               Pins 1 & 3, 2 & 4       Pins 3 & 5 closed
                                  closed

           4v                Pins 3 & 5, 4 & 6              Open
                                  closed

           5v                Pins 1 & 3, 2 & 4       Pins 2 & 4 closed
                                  closed

                     SERIAL PORT 1 INTERRUPT SELECTION

     Serial port 1            Serial port 2                 JP18

          IRQ3                    IRQ4                Pins 1 & 2, 3 & 4
                                                           closed

          IRQ4                    IRQ3                Pins 1 & 3, 2 & 4
                                                           closed

         IRQ11                    IRQ10               Pins 5 & 7, 6 & 8
                                                           closed

         IRQ10                    IRQ11               Pins 5 & 6, 7 & 8
                                                           closed

          IRQ4                    IRQ10               Pins 1 & 3, 7 & 8
                                                           closed

          IRQ4                    IRQ11               Pins 1 & 3, 6 & 8
                                                           closed

          IRQ3                    IRQ10               Pins 1 & 2, 7 & 8
                                                           closed

          IRQ3                    IRQ11               Pins 1 & 2, 5 & 7
                                                           closed

         IRQ11                    IRQ3                Pins 2 & 4, 5 & 6
                                                           closed

         IRQ11                    IRQ4                Pins 3 & 4, 5 & 6
                                                           closed

         IRQ10                    IRQ3                Pins 2 & 4, 5 & 7
                                                           closed

         IRQ10                    IRQ4                Pins 3 & 4, 5 & 7
                                                           closed

           ON BOARD VGA SELECTION

  Setting      JP4        JP5       JP6

  Enabled    Closed     Closed     Closed

  Disabled    Open       Open       Open

         WATCHDOG TIMER SELECTION

       Setting               JP16

      Disabled               Open

        Reset         Pins 5 & 6 closed

        IRQ15         Pins 3 & 4 closed

         NMI          Pins 1 & 2 closed

