
ATEN RESEARCH, INC.

486DX/486SX CACHE MAINBOARD

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      20/25/33/50(internal)/50/66(internal)MHz
Chip Set             UNI
Max. Onboard DRAM    128MB
Cache                32/64/128/256KB
BIOS                 Award
Dimensions           330mm x 218mm
I/O Options          None
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            JP1      Turbo LED                  JP16

  Reset switch               JP14      Speaker                    JP17

  Turbo switch               JP15      Power LED & keylock        JP18

                        USER CONFIGURABLE SETTINGS

                 Function                      Jumper         Position

     CMOS memory normal operation              JP2          pins 1 & 2
                                                               closed

      CMOS memory clear                         JP2          pins 2 & 3
                                                               closed

     CPU speed (external) select               JP3          pins 1 & 2
      16/20/25/33/40MHz                                        closed

      CPU speed (external) select 50MHz         JP3          pins 2 & 3
                                                               closed

     Monitor type select color                 JP12            open

      Monitor type select monochrome            JP12           closed

                          CPU TYPE CONFIGURATION

   Jumper            JP7                  JP9                  JP13

  80486DX2        pins 1 & 2      pins 1 & 2 and 3 & 4      pins 1 & 2
                    closed               closed               closed

   80486DX        pins 1 & 2      pins 1 & 2 and 3 & 4      pins 1 & 2
                    closed               closed               closed

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

   80486SX           open          pins 2 & 3 closed        pins 2 & 3
                                                              closed

             DRAM CONFIGURATION

  Size         Bank 0            Bank 1

   1MB      (4) 256K x 9          NONE

   2MB      (4) 256K x 9      (4) 256K x 9

   4MB       (4) 1M x 9           NONE

   5MB      (4) 256K x 9       (4) 1M x 9

   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 JUMPER CONFIGURATION

    Jumper         32KB           64KB           128KB          256KB

     JP22        pins 2 & 3     pins 2 & 3     pins 2 & 3     pins 1 & 2
                  closed         closed         closed          closed

     JP23        pins 2 & 3     pins 2 & 3     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed

     JP25        pins 1 & 2     pins 2 & 3     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

     JP26        pins 2 & 3     pins 1 & 2     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

     JP27         closed          open           open            open

     JP28          open          closed          open            open

     JP29          open           open          closed           open

     JP30          open           open           open           closed

                    SRAM CONFIGURATION

     Size        Cache SRAM      Location         TAG

     32KB        (4) 8K x 8       Bank 0      (1) 8K x 8

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 8K x 8

     128KB      (4) 32K x 8       Bank 0      (1) 32K x 8

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 32K x 8

