
COMPUTREND SYSTEMS, INC.

VLB S14 (SIS486)

Processor  80486SX/SL80486SX/CX486DX/AM486DX/80486DX/SL80486DX/CX486DX2/
           AM486DX2/80486DX2/SL80486DX2
Processor  25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set   SIS
Max.       128MB
Onboard
DRAM
Cache      128/256KB
BIOS       AMI/Phoenix
Dimensions 260mm x 221mm
I/O        Floppy drive interface, game interface, green PC connector, IDE
Options    interface, parallel port, PS/2 mouse port, serial ports (2),
           VGA feature connector, VGA port, riser slot
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                 Location

  Game interface           CN1        Power LED &            JFP pins 1 -
                                      keylock                     5

  PS/2 mouse port          CN2        Speaker                JFP pins 7 -
                                                                 10

  Serial port 1            CN3        Turbo LED             JFP pins 12 &
                                                                 13

  Serial port 2            CN4        Turbo switch          JFP pins 15 -
                                                                 17

  Parallel port            CN5        Reset switch          JFP pins 19 &
                                                                 20

  VGA port                 CN6        IDE interface LED         JFPA

  Floppy drive             CN7        Green PC connector         JG1
  interface                           (monitor)

  VGA feature              CN8        Green PC LED               JG2
  connector

  IDE interface            CN9        Green PC connector         JG3

  External battery          JB        Riser slot                 SL1

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

      Battery type select internal            JB            Pins 2 & 3
                                                              closed

      Battery type select external            JB              Closed

      Serial port 1 select COM1              JCOM1          Pins 1 & 2
                                                              closed

      Serial port 1 select COM3              JCOM1          Pins 2 & 3
                                                              closed

      Serial port 2 select COM2              JCOM2          Pins 1 & 2
                                                              closed

      Serial port 2 select COM4              JCOM2          Pins 2 & 3
                                                              closed

      Floppy drive interface enabled         JFDD           Pins 1 & 2
                                                              closed

      Floppy drive interface disabled        JFDD           Pins 2 & 3
                                                              closed

      Game port enabled                      JGAME          Pins 1 & 2
                                                              closed

      Game port disabled                     JGAME          Pins 2 & 3
                                                              closed

      IDE interface enabled                  JHDD           Pins 1 & 2
                                                              closed

      IDE interface disabled                 JHDD           Pins 2 & 3
                                                              closed

      Parallel port select LPT1              JPP1           Pins 1 & 2
                                                              closed

      Parallel port select LPT2              JPP1           Pins 2 & 3
                                                              closed

      Parallel port select IRQ7              JPP2           Pins 1 & 2
                                                              closed

      Parallel port select IRQ5              JPP2           Pins 2 & 3
                                                              closed

      On board VGA enabled                   JVGA           Pins 1 & 2
                                                              closed

      On board VGA disabled                  JVGA           Pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

     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

     5MB        (1) 256K x     (1) 512K x     (1) 512K x        None
                    36             36             36

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

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     6MB       (1) 1M x 36     (1) 512K x        None           None
                                   36

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

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

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

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

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

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

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

     12MB      (1) 2M x 36     (1) 512K x     (1) 512K x        None
                                   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

     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) 512K x     (1) 512K 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

     20MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

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

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

     35MB      (1) 8M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

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

     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

     40MB      (1) 2M x 36    (1) 4M x 36    (1) 4M x 36        None

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

     44MB      (1) 8M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

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

     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

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

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

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     50MB         (1) 512K 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

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

     56MB        (1) 2M x 36    (1) 4M x 36    (1) 4M x 36   (1) 4M 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

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

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

     80MB        (1) 4M 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

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

                            CACHE CONFIGURATION

       Size             Bank 0           Bank 1               TAG

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

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

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

                        CACHE JUMPER CONFIGURATION

      Size               JS1               JS2                 JS3

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

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

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

                          CPU TYPE CONFIGURATION

       Type             JC2           JC3           JC4           JC5

       Cyrix         2 & 3, 5 &    2 & 3, 5 &    2 & 3, 5 &    2 & 3, 5 &
                         6             6             6             6

        AMD            6 & 7         6 & 7         6 & 7         6 & 7

       Intel           6 & 7         6 & 7         6 & 7         6 & 7

  Intel SL-series    1 & 2, 6 &    1 & 2, 6 &    1 & 2, 6 &    1 & 2, 6 &
                         7             7             7             7

  Note: Pins designated should be in the closed position.

                    CPU TYPE CONFIGURATION

        Type                 JC6                  JC7

        Cyrix          Pins 1 & 2 closed   Pins 2 & 3 closed

         AMD           Pins 2 & 3 closed   Pins 1 & 2 closed

        Intel          Pins 2 & 3 closed   Pins 1 & 2 closed

                        CPU TYPE CONFIGURATION

               Type                               JC1

                SX                  Pins 2 & 3, 5 & 6, 7 & 8 closed

                DX                  Pins 4 & 7, 2 & 5, 6 & 9 closed

                DX2                 Pins 1 & 4, 2 & 5, 6 & 9 closed

                          CPU SPEED CONFIGURATION

     Speed           JK1            JK2           JK3            JK4

     25MHz        Pins 2 & 3      Closed         Closed         Closed
                   closed

     33MHz        Pins 1 & 2      Closed          Open          Closed
                   closed

     40MHz        Pins 1 & 2      Closed         Closed          Open
                   closed

    50iMHz        Pins 2 & 3      Closed         Closed         Closed
                   closed

     50MHz        Pins 1 & 2       Open          Closed         Closed
                   closed

    66iMHz        Pins 1 & 2      Closed          Open          Closed
                   closed

                CPU VOLTAGE CONFIGURATION

           Voltage                       JP24

            3.3v              Pins 7 & 8, 9 & 10 closed

             5v                Pins 1 & 2, 3 & 4 closed

                    VIDEO MEMORY CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

      512KB       (1) 256K x 16         None            None

       1MB        (1) 256K x 16    (1) 256K x 16        None

       2MB        (1) 256K x 16    (1) 256K x 16    (2) 256K x 16

