
JPN CORPORATION

AT 286


Processor         80286
Processor Speed   12/16/25MHz
Chip Set          ACT
Max. Onboard DRAM 4MB
Cache             None
BIOS              AMI
Dimensions        305mm x 222mm
I/O Options       None
NPU Options       80287


[Image]

                                CONNECTIONS

         Purpose           Location         Purpose            Location

  Turbo LED                  JP2      External battery           JP11

  Power LED & keylock        JP7      Speaker                    JP14

  Reset switch               JP10     Turbo switch               JP19

                         USER CONFIGURABLE JUMPERS

              Function                  Jumper/Switch         Position

     BIOS type select 27128                 JP6             pins 1 & 2
                                                               closed

      BIOS type select 27256                 JP6             pins 2 & 3
                                                               closed

     Monitor type select color              JP9             pins 2 & 3
                                                               closed

      Monitor type select                    JP9             pins 1 & 2
      monochrome                                               closed

     Battery select internal               JP12             pins 2 & 3
                                                               closed

      Battery select external               JP12             pins 1 & 2
                                                               closed

     Power good signal detect              JP13             pins 1 & 2
      from power supply                                        closed

      Power good signal detect              JP13             pins 2 & 3
      from board                                               closed

     Bus speed select 8Mhz                 JP17             pins 1 & 2
                                                               closed

      Bus speed select 6Mhz                 JP17             pins 2 & 3
                                                               closed

     Parity check enabled                  JP20             pins 1 & 2
                                                               closed

      Parity check disabled                 JP20             pins 2 & 3
                                                               closed

     DRAM speed select 1 wait              SW1/4                On
      state

      DRAM speed select 0 wait              SW1/4               Off
      states

                            DRAM CONFIGURATION

  Size      Bank 0     Parity     Bank 1      Parity    Bank 2    Bank 3
                       (P-0)                  (P-1)

  512KB       (4)        (2)       NONE       NONE       NONE      NONE
            44256      41256

  512KB      NONE       NONE       NONE       NONE        (2)      NONE
                                                        256K x
                                                          9

  640KB       (4)        (2)     (4) 4464    (2) 4164    NONE      NONE
            44256      41256

  640KB      NONE       NONE     (4) 4464    (2) 4164     (2)      NONE
                                                        256K x
                                                          9

   1MB        (4)        (2)        (4)        (2)       NONE      NONE
            44256      41256      44256       41256

   1MB        (4)        (2)       NONE       NONE       NONE       (2)
            44256      41256                                       256K x
                                                                     9

   1MB       NONE       NONE       NONE       NONE        (2)       (2)
                                                        256K x     256K x
                                                          9          9

   2MB       NONE       NONE       NONE       NONE      (2) 1M     NONE
                                                         x 9

   4MB       NONE       NONE       NONE       NONE      (2) 1M     (2) 1M
                                                         x 9        x 9

      DRAM SWITCH CONFIGURATION

  Size     SW1/1    SW1/2    SW1/3

  512KB     On        On       On

  640KB     On       Off      Off

   1MB      On       Off       On

   2MB      Off       On       On

   4MB      Off      Off       On

