DTK COMPUTER, INC.

TURBO 640

Processor         8088-2
Processor Speed   8MHz
Chip Set          None
Max. Onboard DRAM 640K
Cache             None
BIOS              DTK/ERSO
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       8087-2

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Reset switch                JP1      Turbo switch                JP5

  Power LED & turbo LED       JP2      Keylock                     JP8

  Speaker                     JP4

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Factory configured - do not       SW1/switch 1            Off
      alter

  »   NPU absent                        SW1/switch 2            Off

      NPU present                       SW1/switch 2             On

                       DRAM CONFIGURATION

    Size        Bank 0       Bank 1      Bank 2       Bank 3

    64KB       (9) 4164       NONE        NONE         NONE

    128KB      (9) 4164     (9) 4164      NONE         NONE

    192KB      (9) 4164     (9) 4164    (9) 4164       NONE

    256KB      (9) 4164     (9) 4164    (9) 4164     (9) 4164

    256KB     (9) 41256       NONE        NONE         NONE

    512KB     (9) 41256    (9) 41256      NONE         NONE

    576KB     (9) 41256    (9) 41256    (9) 4164       NONE

    640KB     (9) 41256    (9) 41256    (9) 4164     (9) 4164

                         DRAM JUMPER CONFIGURATION

    Size        JPA       JPB       JPC       JPD       JPE        JPF

    64KB      Closed     Closed     Open      Open      Open      Closed

    128KB     Closed     Closed     Open      Open      Open      Closed

    192KB     Closed     Closed     Open      Open      Open      Closed

    256KB     Closed     Closed     Open      Open      Open      Closed
    (using
    4164)

    256KB      Open       Open     Closed    Closed    Closed      Open
    (using
   41256)

    512KB      Open       Open     Closed    Closed    Closed      Open

    576KB      Open       Open     Closed    Closed    Closed      Open

    640KB      Open       Open     Closed    Closed    Closed      Open

                          CPU SPEED CONFIGURATION

          Setting                    JP6                     JP7

   Switchable from turbo            Closed                  Open
          switch

  Switchable from keyboard           Open                  Closed

                FLOPPY DRIVE CONFIGURATION

  Drives installed         SW1/7               SW1/8

         1                  On                  On

         2                  Off                 On

         3                  On                  Off

         4                  Off                 Off

           MONITOR CONFIGURATION

     Type          SW1/5          SW1/6

  EGA or none        On            On

  40 x 25 CGA       Off            On

  80 x 25 CGA        On            Off

  Monochrome        Off            Off