
AT & T, INC.

6300 XT

Processor                    8086
Processor Speed              4.77MHz
Chip Set                     None
Max. Onboard DRAM            640KB
Cache                        None
BIOS                         AT&T
Dimensions                   272mm x 254mm
I/O Options                  Parallel port, serial ports (2), floppy drive
                             interface
NPU Options                  8087

[Image]

                         SYSTEM BOARD CONNECTIONS

  Purpose                  Location      Purpose               Location

  To CRT controller           J1         Serial port 2            J5
  board at J9

  To CRT controller           J2         Keyboard                 J6
  board at J11

  Serial port 1               J3         Floppy drive             J7

  Parallel port               J4         +/- 12V Power            P1

  Note:Bus converter board and display enhancement board not shown.

                  SYSTEM BOARD USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Factory configured - do not            JA                 N/A
      alter

     Factory configured - do not            JB                 N/A
      alter

     Clock enabled                          JC                Closed

      Clock disabled                         JC                 Open

     Factory configured - do not            JD                 N/A
      alter

     Clock battery enabled                  JE                Closed

      Clock battery disabled                 JE                 Open

     NPU enabled                           SW0/5               Off

      NPU disabled                          SW0/5                On

     Serial interface select 8250          SW0/6                On

      Serial interface select 8350          SW0/6               Off

     BIOS type select 2732                 SW0/8                On

      BIOS type select 2764                 SW0/8               Off

     Disk drive select 96 TPI              SW1/1               Off

      Disk drive select 48 TPI              SW1/1                On

     Disk drive select fast                SW1/2               Off
      start-up

      Disk drive select slow                SW1/2                On
      start-up

                      DRAM CONFIGURATION

    Size       Bank 0       Bank 1       Bank 2       Bank 3

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

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

   512KB      (9) 4464     (9) 4464       NONE         NONE

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

          DRAM SWITCH CONFIGURATION

  Size    SW0/1     SW0/2    SW0/3    SW0/4

  128KB    Off       On       On       On

  256KB     On       Off      On       On

  512KB     On       On       Off      On

  640KB    Off       On       Off      On

           VIDEO CONFIGURATION

     Size         SW1/5        SW1/6

  80 columns       On           Off

  40 columns       Off           On

     HARD DRIVE CONFIGURATION

  Setting      SW1/3      SW1/4

  Enabled       Off        Off

  Disabled      On          On

                FLOPPY DRIVE CONFIGURATION

  Drives installed         SW1/7               SW1/8

         1                  On                  On

         2                  Off                 On

[Image]

                     CRT CONTROLLER BOARD CONNECTIONS

  Purpose                Location     Purpose                  Location

  To bus converter          J8        Monitor                     J12
  board

  To system board at        J9        To display                  J13
  J1                                  enhancement board

  To bus converter          J10       +15V Power                  P2
  board

  To system board at        J11
  J2

              CRT CONTROLLER BOARD USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Oscillator select internal               JF            pins 2 & 3
                                                              closed

      Oscillator select on display             JF            pins 4 & 5
      enhancement board                                       closed

     Clock select internal                    JF            pins 5 & 6
                                                              closed

      Oscillator select 24MHz                  JF            pins 1 & 2
                                                              closed

