
SIREX

640KB TURBO SYSTEM

Processor         8088
Processor Speed   4.77/8MHz
Chip Set          None
Max. onboard DRAM 640KB
SRAM Cache        None
BIOS              Phoenix
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       8087

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Keylock                     C1       Speaker                     C4

  Power LED                   C2       Reset switch                C5

  Turbo LED                   C3

                        USER CONFIGURABLE SETTINGS

              Function                   Jumper/Switch        Position

     CPU speed select low                     J1             pins 1 & 2
      switchable via keyboard                                  closed

      CPU speed select high                    J1             pins 3 & 4
      switchable via keyboard                                  closed

      CPU speed select normal/turbo            J1             pins 5 & 6
      switchable via keyboard                                  closed

     Factory configured - do not         SW1/switch 1           Off
      alter

     NPU disabled                        SW1/switch 2           On

      NPU enabled                         SW1/switch 2           Off

     Factory configured - do not         SW1/switch 3           Off
      alter

     Factory configured - do not         SW1/switch 4           Off
      alter

  Note: The board can only use the normal/turbo mode with a reprogrammed
  BIOS, this option may not be available on all boards.

                         DRAM CONFIGURATION

     Size        Bank 0        Bank 1        Bank 2        Bank 3

    256KB       (8) 41256       NONE          NONE          NONE

    512KB       (8) 41256     (8) 41256       NONE          NONE

    578KB       (8) 41256     (8) 41256    (8) 4164KB       NONE

    640KB       (8) 41256     (8) 41256    (8) 4164KB    (8) 4164KB

                          EPROM/ROM CONFIGURATION

   Switch      2764 (U25A)    27128 (U25B)      8K ROM         32K ROM
                                               (U25A)          (U25C)

    SW2/1          On             On             On              Off

    SW2/2          Off            Off            Off             On

    SW2/3          On             Off            On              Off

    SW2/4          Off            On             Off             On

    SW2/5          On             On             Off             On

    SW2/6          Off            Off            On              Off

    SW2/7          On             On             Off             On

    SW2/8          Off            Off            On              Off

    SW3/1          Off            On             Off             On

    SW3/2          On             Off            On              Off

    SW3/3          Off            Off            Off             On

    SW3/4          On             On             On              Off

                           DISPLAY CONFIGURATION

    Display Adapter        SW1/5        SW1/6       SW1/7        SW1/8

          None               On          Off         N/A          N/A

     Color/Graphics         Off          On           On           On
        (40x20)

     Color/Graphics          On          Off          On           On
        (80x25)

   Monochrome or Both       Off          Off          On           On

                FLOPPY DRIVE CONFIGURATION

  Drives Installed         SW1/7              SW1/8

         1                  On                  On

         2                  Off                 On

         3                  On                 Off

         4                  Off                Off

