NCR CORPORATION

CLASS 3421

Processor               80386SX
Processor Speed         20MHz
Chip Set                NCR
Max. Onboard DRAM       8MB
Cache                   None
BIOS                    AMI
Dimensions              381mm x 254mm
I/O Options             Serial port, parallel port, PS/2 mouse port, SCSI
                        interface (2), floppy drive interface, CPU upgrade
                        slot, proprietary SIMM sockets (3)
NPU Options             80387SX

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                 Location

  Video controller         CN1        IDE/floppy drive           CN8
                                      power

  Internal SCSI            CN2        FS1 header                 JP1
  interface

  External SCSI            CN3        SCSI terminating       R1, R2, R3
  interface                           resistors

  Serial port              CN4        Proprietary SIMM       S1, S2, S3
                                      socket

  Parallel port            CN5        MCA slot               S4, S5, S6,
                                                                 S7

  PS/2 mouse port          CN6        CPU upgrade slot           S8

  Floppy drive             CN7
  interface

  Note: Pin 1 locations unverified.

                            DRAM CONFIGURATION

     Size          Bank 0           S1            S2              S3

      2MB           2MB            NONE          NONE            NONE

      4MB           2MB        (1) 1M x 18       NONE            NONE

      6MB           2MB        (1) 1M x 18    (1) 1M x 18        NONE

      8MB           2MB        (1) 1M x 18    (1) 1M x 18    (1) 1M x 18

  Note: Bank 0 factory installed and is not configurable. Locations and
  individual chip sizes for Bank 0 inside DRAM area are unknown.