JOINDATA SYSTEMS, INC.

G486PEL

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             OPTI
Max. Onboard DRAM    128MB
Cache                64/128/256KB
BIOS                 AMI
Dimensions           330mm x 218mm
I/O Options          32-bit local bus card slots (2)
NPU Options          4167

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  32-bit local bus card      COM1      Turbo switch                J11

  32-bit local bus card      COM2      Speaker                     J12

  Reset switch                J9       Power LED & keylock         J13

  Turbo LED                  J10

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

  »   Monitor type select monochrome           JP1             Open

      Monitor type select color                JP1            Closed

  »   Factory configured - do not alter        JP2           pins 2 & 3
                                                              closed

             DRAM CONFIGURATION

     Size          Bank 0        Bank 1

      4MB        (4) 1M x 9       NONE

      8MB        (4) 1M x 9    (4) 1M x 9

     16MB        (4) 4M x 9       NONE

     20MB        (4) 1M x 9    (4) 4M x 9

     20MB        (4) 4M x 9    (4) 1M x 9

     32MB        (4) 4M x 9    (4) 4M x 9

     64MB        (4) 16M x 9      NONE

     128MB       (4) 16M x 9   (4) 16M x 9

                            CACHE CONFIGURATION

   Size      Bank 0     Bank 1    TAG (U39)    TAG(U42)         Dirty
                                                              Bit(U43)

   64KB       (4) 8K    (4) 8K     (1) 8K x   (1) 16K x 4    (1) 16K x 4
               x 8       x 8          8

   128KB     (4) 32K     NONE      (1) 8K x   (1) 16K x 4    (1) 16K x 4
               x 8                    8

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

  Note:256KB configuration requires the addition of (1) 8K x 8 tag chip
  at (U38).

                        CACHE JUMPER CONFIGURATION

   Size        JP4          JP5         JP6         JP7           JP8

   64KB        Open        Open         Open        Open       pins 2 & 3
                                                                closed

   128KB       Open       Closed        Open       Closed      pins 1 & 2
                                                                closed

   256KB      Closed      Closed       Closed      Closed      pins 2 & 3
                                                                closed

                          CPU TYPE CONFIGURATION

          Type                     JP15                     JP17

         80486SX             pins 1 & 2 closed        pins 1 & 2, 3 & 4
                                                           closed

         80487SX             pins 2 & 3 closed        pins 1 & 2, 3 & 4
                                                           closed

         80486DX                   Open              pins 2 & 3 closed

        80486DX2                   Open              pins 2 & 3 closed

                          CPU SPEED CONFIGURATION

     Speed         JP9     JP12     JP11     JP13      JP14        JP16

   80486SX-20     2 & 3   2 & 3    1 & 2     2 & 3     Open        Open

   80486SX-25     1 & 2   1 & 2    1 & 2     2 & 3     Open        Open

   80486DX-25     1 & 2   1 & 2    1 & 2     2 & 3     Open        Open

   80486DX-33     1 & 2   1 & 2    2 & 3     2 & 3     Open       Closed

   80486DX-50     1 & 2   1 & 2    1 & 2     1 & 2    Closed      Closed

  80486DX2-50     1 & 2   1 & 2    1 & 2     2 & 3     Open        Open

  Note: Oscillator speed remains synchronous with the CPU, except when
  using an 80486DX2-50, the oscillator should be 25MHz. Pins designated
  should be in the closed position.