UNIDENTIFIED

XTT

Processor              8088
Processor Speed        4.77/8MHz
Chip Set               Unidentified
Video Chip Set         None
Maximum Onboard Memory 640KB
Maximum Video Memory   None
Cache                  None
BIOS                   Unidentified
Dimensions             330mm x 218mm
I/O Options            None
NPU Options            8087

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  Power LED &               JP7        Turbo switch        JP8 pins 3 & 4
  keylock

  Reset switch          JP8 pins 1 &   Speaker                  JP9
                             2

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Wait state select 3 wait states         JP3           Pins 2 & 3
                                                              closed

      Wait state select 2 wait states         JP3           Pins 1 & 2
                                                              closed

      SW1/5 is set to on                      JP5             Closed

      SW1/5 is set to off                     JP5              Open

  »   Factory configured - do not alter      SW1/1             Off

      NPU not installed                      SW1/2              On

      NPU installed                          SW1/2             Off

                      DRAM CONFIGURATION

    Size       Bank 0       Bank 1       Bank 2       Bank 3

   256KB      (9) 41256      None         None         None

   512KB      (9) 41256    (9) 41256      None         None

   640KB      (9) 41256    (9) 41256   (9) 41256       None

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

                         DRAM JUMPER CONFIGURATION

   Number of banks with 41256 chips                    JP4
              installed

                  0                         Pins 1 & 3, 2 & 4 closed

                  1                             Pins 2 & 4 closed

                  2                             Pins 1 & 3 closed

                  3                                   Open

        DRAM SWITCH CONFIGURATION

  Banks used      SW1/3        SW1/4

      1            On            On

      2            On           Off

      3            Off           On

      4            Off          Off

                     CPU SPEED SELECTION

             Speed                          JP6

  Switchable through keyboard        Pins 1 & 2 closed

            4.77MHz                         Open

             8MHz                    Pins 2 & 3 closed

                  FLOPPY DRIVE SELECTION

  Drives installed         SW1/7               SW1/8

         1                  On                  On

         2                  On                  Off

         3                  Off                 On

         4                  Off                 Off

                   MONITOR SELECTION

       Type              SW1/5              SW1/6

        EGA                On                 On

  Color (80 x 25)          On                Off

  Color (40 x 25)         Off                 On

    Monochrome            Off                Off

                              BIOS SELECTION

             Type                                  JP2

             2764                Pins 3 & 15, 4 & 14, 5 & 13, 6 & 12, 7 &
                                            11, 8 & 10 closed

            27128                Pins 2 & 15, 3 & 14, 4 & 13, 5 & 12, 6 &
                                            11, 7 & 10 closed

            27256                Pins 1 & 15, 2 & 14, 3 & 13, 4 & 12, 5 &
                                            11, 6 & 10 closed