NCR CORPORATION

MODEL 3386-0XXX PC 920

Processor              80386
Processor Speed        20MHz
Chip Set               Unidentified
Video Chip Set         None
Maximum Onboard Memory 2MB (on external memory card)
Maximum Video Memory   None
Cache                  None
BIOS                   Unidentified
Dimensions             Unidentified
I/O Options            External memory card, PS/2 mouse port
NPU Options            80387/3167

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                  Location

  PS/2 mouse port           CN1       Speaker                     J4

  External battery          J2        Auxiliary keyboard          J5
                                      connector

  Keylock                   J3

                        USER CONFIGURABLE SETTINGS

                 Function                     Label          Position

  »   Monitor type select color                SW1              On

      Monitor type select monochrome           SW1              Off

  »   NPU not installed (if Weitek NPU        SW2/1             Off
      is installed, set switch to off)

      NPU installed                           SW2/1             On

  »   PS/2 mouse disabled                     SW2/2             Off

      PS/2 mouse enabled                      SW2/2             On

  »   Video ROM copied to RAM                 SW2/3             Off

      Video ROM not copied to RAM             SW2/3             On

  »   Non maskable interrupt generated        SW2/4             Off
      from fail safe timer disabled

      Non maskable interrupt generated        SW2/4             On
      from fail safe timer enabled

  »   IRQ10 disabled                          SW2/5             Off

      IRQ10 enabled                           SW2/5             On

  »   IRQ11 disabled                          SW2/6             Off

      IRQ11 enabled                           SW2/6             On

  »   IRQ12 disabled                          SW2/7             Off

      IRQ12 enabled                           SW2/7             On

                   CPU SPEED SELECTION

            Speed                       SW2/8

  8MHz (auto speed select)               Off

  20MHz (high speed select)               On

[Image]

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Wait state select 0 wait states        J1/JP1         Pins 1 & 2
                                                              closed

      Wait state select 1 wait states        J1/JP1         Pins 2 & 3
                                                              closed

                   DRAM CONFIGURATION

       Size             Bank 0             Bank 1

       1MB            (36) 411000           None

       2MB            (36) 411000       (36) 411000

  Note: The location of banks 0 & 1 are unidentified.

                      DRAM JUMPER CONFIGURATION

               Size                              J2/JP2

                1MB                 Pins 2 & 3, 5 & 6, 8 & 9 closed

                2MB                 Pins 1 & 2, 4 & 5, 7 & 8 closed

            DRAM SWITCH CONFIGURATION (ONE 2MB BOARD INSTALLED)

  Setting     SW1/1  SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

   Set for     On     On      On      On      On      On      On      On
  first 2MB
  boundary

  Setting     SW2/1  SW2/2   SW2/3   SW2/4   SW2/5   SW2/6   SW2/7   SW2/8

   Locate      On     Off     On      On      On      On      On      On
  256KB at
   end of
  second MB
  of space.

           DRAM SWITCH CONFIGURATION (TWO 2MB BOARDS INSTALLED)

  Setting     SW1/1  SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

   Set for     On     On      On      On      On      On      On      On
  first 2MB
  boundary
  (board 1)

   Set for    Off     On      On      On      On      On      On     Off
  first 2MB
  boundary
  (board 2)

  Setting     SW2/1  SW2/2   SW2/3   SW2/4   SW2/5   SW2/6   SW2/7   SW2/8

   Locate      On     On      Off     On      On      On      On      On
  256KB at
   end of
  second MB
  of space.
  (board 1)

   Not the    Off     Off     Off     Off     Off    Off     Off     Off
  first MB
   in the
   system
  (board 2)

          DRAM SWITCH CONFIGURATION (THREE 2MB BOARDS INSTALLED)

  Setting     SW1/1  SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

   Set for     On     On      On      On      On      On      On      On
  first 2MB
  boundary
  (board 1)

   Set for    Off     On      On      On      On      On      On     Off
  first 2MB
  boundary
  (board 2)

   Set for     On     Off     On      On      On      On      On     Off
  third 2MB
  boundary
  (board 3)

  Setting     SW2/1  SW2/2   SW2/3   SW2/4   SW2/5   SW2/6   SW2/7   SW2/8

   Locate      On     Off     Off     On      On      On      On      On
  256KB at
   end of
  sixth MB
  of space.
  (board 1)

     All      Off     Off     Off     Off     Off    Off     Off     Off
  switches
     off
  (board 2)

     All      Off     Off     Off     Off     Off    Off     Off     Off
  switches
     off
  (board 3)

           DRAM SWITCH CONFIGURATION (FOUR 2MB BOARDS INSTALLED)

  Setting     SW1/1  SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

   Set for     On     On      On      On      On      On      On      On
  first 2MB
  boundary
  (board 1)

   Set for    Off     On      On      On      On      On      On     Off
  first 2MB
  boundary
  (board 2)

   Set for     On     Off     On      On      On      On      On     Off
  third 2MB
  boundary
  (board 3)

   Set for    Off     Off     On      On      On      On      On     Off
  third 2MB
  boundary
  (board 4)

     All      N/A     N/A     N/A     N/A     N/A    N/A     N/A     N/A
  switches
     off
  (board 4)

  Setting     SW2/1  SW2/2   SW2/3   SW2/4   SW2/5   SW2/6   SW2/7   SW2/8

   Locate      On     On      On      Off     On      On      On      On
  256KB at
   end of
  eighth MB
  of space.
  (board 1)

     All      Off     Off     Off     Off     Off    Off     Off     Off
  switches
     off
  (board 2)

     All      Off     Off     Off     Off     Off    Off     Off     Off
  switches
     off
  (board 3)

     All      Off     Off     Off     Off     Off    Off     Off     Off
  switches
     off
  (board 4)