HEDAKA

HED-981, HED-984

Processor         80286
Processor Speed   12MHz
Chip Set          VLSI
Max. Onboard DRAM 4MB
Cache             None
BIOS              AMI/Award
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Reset switch                JP1      Turbo switch                JP4

  Power LED & keylock         JP2      Turbo LED                   JP5

  Speaker                     JP3      External battery           JP17

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Location

  »   Factory configured - do not alter        JP0              N/A

      Memory speed select 100ns                JP6           pins 1 & 2
                                                              closed

  »   DRAM select 0 wait states               JP10            Closed

      DRAM select 1 wait state                JP10             Open

  »   BIOS type select 27256                  JP11           pins 1 & 2
                                                              closed

      BIOS type select 27128                  JP11           pins 2 & 3
                                                              closed

  »   Monitor type select color               JP12           pins 1 & 2
                                                              closed

      Monitor type select monochrome          JP12           pins 2 & 3
                                                              closed

  »   Factory configured - do not alter       JP13              N/A

  »   Factory configured - do not alter       JP14              N/A

  »   Factory configured - do not alter       JP15              N/A

  »   Factory configured - do not alter       JP18              N/A

  »   Battery select internal                  JPA           pins 1 & 2
                                                              closed

      Battery select external                  JPA             Open

                            DRAM CONFIGURATION

  Size     Bank 0     Bank 1     Bank 2    Bank 3      P-0         P-1

  512KB      (16)      NONE       NONE      NONE        (2)       NONE
            41256                                     41256

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

  640KB     NONE        (16)       (4)      NONE        (2)     (2) 4164
                       4164      44256                41256

   1MB       (16)       (16)      NONE      NONE        (2)       NONE
            41256      41256                          41256

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

   2MB       (16)      NONE       NONE      NONE        (2)       NONE
           411000                                     411000

   4MB       (16)       (16)      NONE      NONE        (2)        (2)
           411000     411000                          411000     411000

       DRAM JUMPER CONFIGURATION

   Size      JP7       JP8       JP9

  512KB     Closed   Closed    Closed

  640KB     Closed   Closed     Open

   1MB      Closed    Open     Closed

   2MB      Closed    Open      Open

   4MB       Open    Closed    Closed