NCR CORPORATION

PC916SX

Processor         80386SX
Speed             16MHz
Chip Set          Unidentified
Max. Onboard DRAM 1MB
BIOS              Unidentified
Cache             None
Dimensions        290mm x 106mm
I/O Options       External memory card slot
NPU Options       80387SX

[Image]

                                CONNECTIONS

      Purpose          Location            Purpose            Location

  External Battery        J2         Keyboard connector          J5

  Turbo LEDs &            J3         Proprietary external     P11 & P12
  keylock                            memory port

  Speaker & volume        J4
  control

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Pipeline mode disabled             JP3-I/JP3-II        pins 2 & 3
                                                               closed

      Pipeline mode enabled              JP3-I/JP3-II        pins 1 & 2
                                                               closed

  »   Monitor type select color               S1             pins 1 & 2
                                                               closed

      Monitor type select                     S1             pins 2 & 3
      monochrome                                               closed

  »   Power-on speed select fast              S2             pins 1 & 2
                                                               closed

  »   Power-on speed select slow              S2             pins 2 & 3
                                                               closed

  »   DRAM speed select slow                SW3/1               Off

      DRAM speed select fast                SW3/1                On

  »   DMA speed select automatic            SW3/2               Off

      DMA speed select 8MHz                 SW3/2                On

  »   Memory 0-512KB enabled                SW3/3               Off

      Memory 0-256KB enabled,               SW3/3                On
      256-512KB disabled

  »   Memory 512-1024KB enabled             SW3/4               Off

      Memory 512-1024KB disabled             SW34                On

      Notes:JP3-I is found on Type MMI mainboard, JP3-II is found on Type
      MMII mainboard.

                    DRAM CONFIGURATION

            Size                         Bank 0

             1MB                       (8) 44256

  Note:Memory chip sizes and locations are unidentified.

                      DRAM - I/O SPEED CONFIGURATION

   IOW, MEMW, MEMR           IOR              JP1               JP2

  »        500ns            750ns          pins 2 & 3        pins 1 & 2
                                            closed            closed

           250ns            500ns          pins 2 & 3        pins 2 & 3
                                            closed            closed

           750ns           1000ns          pins 1 & 2        pins 2 & 3
                                            closed            closed

          1000ns           1250ns          pins 1 & 2        pins 1 & 2
                                            closed            closed

                        DRAM MAPPING CONFIGURATION

    Extended      Mapping area     SW3/5     SW3/6      SW3/7      SW3/8
     memory

      0MB           100000 -        Off        On         On        On
                    160000h

      1MB           200000 -        On        Off         On        On
                    260000h

      2MB           300000 -        Off       Off         On        On
                    360000h

      3MB           400000 -        On         On        Off        On
                    460000h

      4MB           500000 -        Off        On        Off        On
                    560000h

      5MB           600000 -        On        Off        Off        On
                    660000h

      6MB           700000 -        Off       Off        Off        On
                    760000h

      7MB           800000 -        On         On         On        Off
                    860000h

      8MB           900000 -        Off        On         On        Off
                    960000h

      9MB           A00000 -        On        Off         On        Off
                    A60000h

      10MB          B00000 -        Off       Off         On        Off
                    B60000h

      11MB          C00000 -        On         On        Off        Off
                    C60000h

      12MB           D00000         Off        On        Off        Off
                    D60000h

      13MB          E00000 -        On        Off        Off        Off
                    E60000h

      14MB          F00000 -        Off       Off        Off        Off
                    F60000h