
AMERICAN DIGICOM CORPORATION

486E CACHE MAINBOARD

Processor             80486SX/80487SX/80486DX/80486DX2
Processor Speed       20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set              OPTI
Max. onboard DRAM     128MB
SRAM Cache            64/128/256/512KB
BIOS                  AMI
Dimensions            330.2mm x 215.8mm
I/O Options           None
NPU Options           4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J4       Turbo LED                 JP17

  Power LED & keylock          J5       Reset switch               S9

  Turbo switch                JP16

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     I/O bus mode select EISA                 JP0             Open

      I/O bus mode select ISA                  JP0            Closed

     Monitor type select color                JP4            Closed

      Monitor type select monochrome           JP4             Open

     Factory configured - do not alter        JP6             Open

                          CPU TYPE CONFIGURATION

   Jumper         80486SX            80487SX             80486DX/DX2

     JP7         pins 2 & 3      pins 1 & 2 and 3    pins 1 & 2 and 3 & 4
                   closed           & 4 closed             closed

     JP9            Open            pins 1 & 2        pins 2 & 3 closed
                                      closed

                          CPU SPEED CONFIGURATION

   Speed        iOSC          JP1          JP2         JP3         JP8

   20MHz        40MHz        Open         Closed     pins 2 &    pins 2 &
                                                        3           3

   25MHz        50MHz        Open          Open      pins 1 &    pins 2 &
                                                        2           3

   33MHz        66MHz       Closed         Open      pins 1 &    pins 2 &
                                                        2           3

   40MHz        80MHz        Open         Closed     pins 1 &    pins 2 &
                                                        2           3

  50i MHz       50MHz        Open          Open      pins 1 &    pins 2 &
                                                        2           3

   50MHz        50MHz       Closed        Closed     pins 1 &    pins 1 &
                                                        2           2

  66i MHz       66MHz       Closed         Open      pins 1 &    pins 2 &
                                                        2           3

             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

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

  64MB      (4) 16M x 9           NONE

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

                            SRAM CONFIGURATION

   Size      Bank 0     Bank 1     U49        U50       U51        U64

   64KB     (4) 8K x    (4) 8K    (1) 64K    (1) 8K     NONE      (1) 16K
               8         x 8       x 1        x 8                  x 1

  128KB      (4) 32K     NONE     (1) 64K    (1) 8K     NONE      (1) 16K
              x 8                  x 1        x 8                  x 1

  256KB      (4) 32K    (4) 32K   (1) 64K    (1) 8K    (1) 8K     (1) 16K
              x 8        x 8       x 1        x 8       x 8        x 1

  512KB     (4) 128K     NONE     (1) 64K   (1) 32K     NONE      (1) 64K
              x 8                  x 1        x 8                  x 1

                         SRAM JUMPER CONFIGURATION

   Jumper         64KB           128KB          256KB           512KB

     JP5        pins 2 & 3     pins 1 & 2     pins 2 & 3      pins 1 & 2
                 closed         closed          closed         closed

    JP10          Open           Open            Open          Closed

    JP11          Open           Open           Closed         Closed

    JP12          Open          Closed          Closed         Closed

    JP13          Open           Open           Closed         Closed

    JP14          Open          Closed          Closed         Closed

    JP15          Open           Open            Open          Closed

