
HEDAKA

HED-988

Processor         80286
Processor Speed   12/16/20MHz
Chip Set          HEDAKA
Max. Onboard DRAM 4MB
SRAM Cache        None
BIOS              AMI
Dimensions        330.2mm x 218.4mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Speaker                     CN1      Turbo LED                   CN5

  Reset switch                CN2      Turbo switch                JP4

  Power LED & keylock         CN3      External battery            JP5

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

     NPU mode select synchronous with         JP1           pins 2 & 3
      CPU                                                     closed

      NPU mode select synchronous with         JP1           pins 1 & 2
      oscillator installed at OSC1                            closed

     NPU speed select iOSC/3                  JP2           pins 2 & 3
                                                              closed

      NPU speed select iOSC/1                  JP2           pins 1 & 2
                                                              closed

     Monitor type select color                JP6           pins 2 & 3
                                                              closed

      Monitor type select monochrome           JP6           pins 1 & 2
                                                              closed

     CMOS memory normal operation             JP7             open

      CMOS memory clear                        JP7            closed

     Parity check enabled                     JP13            open

      Parity check disabled                    JP13           closed

  Note:When JP7 is closed it also disables the password set in the CMOS

                            DRAM CONFIGURATION

  Size       Bank      P-0      Bank 1      P-1      Bank 0       Bank 1
           0(DIP)               (DIP)                (SIPP)      (SIPP)

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

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

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

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

  1.5MB      (4)        (2)       (4)       (2)     (2) 256K      NONE
            44256     41256     44256      41256      x 9

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

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

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

                         DRAM JUMPER CONFIGURATION

    Size       Jumper       Jumper      Jumper       Jumper      Jumper
                JP8          JP9         JP10        JP11         JP12

   512KB        open       closed       closed      closed       closed

    1MB        closed       open        closed      closed       closed

   1.5MB        open        open        closed      closed       closed

    2MB        closed      closed        open       closed       closed

   2MB 1       closed      closed        open       closed        open

    4MB         open       closed        open       closed        open

  Note 1 :Setting represents (2) 1M x 9 SIPPs installed.

