
NEC TECHNOLOGIES, INC.

BusinessMate 486/25E

Processor              80486DX
Processor Speed        25MHz
Chip Set               Intel
Max. Onboard DRAM      16MB (on system memory card)
Cache                  None
BIOS                   NEC (flash EEPROM)
Dimensions             330mm x 218mm
I/O Options            Proprietary serial/parallel card, keyboard/Bus
                       mouse interface, floppy drive interface,
                       proprietary system memory bus
NPU Options            80387/3167

[Image]

                                CONNECTIONS

  Purpose               Location     Purpose                   Location

  Proprietary system       J8        Floppy drive interface       P7
  memory bus

  Speaker                  P1        Power supply                 P8

  Keyboard/Bus mouse       P2        Drive power supply           P9
  interface

  External battery         P3        Proprietary                  P10
                                     serial/parallel card

  Power LED & Turbo        P6        Auxiliary drive power        P12
  LED                                supply

  Note: Either a proprietary system memory card or a proprietary memory
  bus expansion card may be installed at J8. The proprietary memory bus
  expansion card has four slots that may be populated by up to four 2MB
  expansion cards.

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper/Switch      Position

     RDY signal from DODA select DMY           11B2           pins 1 & 2
      RDY                                                       closed

      RDY signal from DODA select BRDY          11B2           pins 2 & 3
                                                                closed

     Factory configured - do not alter         18F1             Open

     EISA memory write speed select 0          18F2            Closed
      wait states

      EISA memory write speed select 1          18F2             Open
      wait state

     CPU self-test enabled                  21D1 & 4D1        pins 1 & 2
                                                                closed

      CPU self-test enabled                  21D1 & 4D1        pins 2 & 3
                                                                closed

     Floppy interface transfer rate             2D1           pins 1 & 2
      500/300/250/150/125KB                                     closed

      Floppy interface transfer rate             2D1           pins 2 & 3
      500/300/250/150KB                                         closed

     Reset enabled                              2J1             Open

      Reset disabled                             2J1            Closed

     Test mode disabled                         2N2             Open

      Test mode enabled                          2N2            Closed

     Password enabled                           5J2           pins 1 & 2
                                                                closed

      Password disabled                          5J2           pins 2 & 3
                                                                closed

     A20 gate output select keyboard            5J3           pins 1 & 2
      controller                                                closed

      A20 gate output select PAL                 5J3           pins 2 & 3
      (Novell workaround)                                       closed

     Keyboard controller W/R select             5K3           pins 1 & 2
      PAL (Novell workaround)                                   closed

      Keyboard controller W/R select             5K3           pins 2 & 3
      normal XIOWT                                              closed

     Keyboard controller input select           5K4           pins 1 & 2
      12HMz                                                     closed

      Keyboard controller input select           5K4           pins 2 & 3
      8.33HMz                                                   closed

     STBY signal for RTC select PWREN           6K3           pins 1 & 2
      -0                                                        closed

      STBY signal for RTC select PWREN           6K3           pins 2 & 3
      +0                                                        closed

     ROM test mode (looping) disabled           8M2             Open

      ROM test mode (looping) enabled            8M2            Closed

     Factory configured - do not alter          9E1           pins 2 & 3
                                                                closed

     Factory configured - do not alter          9E2           pins 2 & 3
                                                                closed

     Monitor type select color                 SW1/1             On

      Monitor type select monochrome            SW1/1             Off

     Floppy drive interface address            SW1/2             Off
      select primary (drive A)

      Floppy drive interface address            SW1/2             On
      select secondary (drive B)

     Floppy drive interface enabled            SW1/3             On

      Floppy drive interface disabled           SW1/3             Off

                    USER CONFIGURABLE SETTINGS (CON'T)

                   Function                      Switch        Position

                  Serial port (COM2)            SW1/4            On
                   enabled

                   Serial port (COM2)            SW1/4           Off
                   disabled

                  Serial port (COM1)            SW1/5            On
                   enabled

                   Serial port (COM1)            SW1/5           Off
                   disabled

                  Parallel port enabled         SW1/6            On

                   Parallel port disabled        SW1/6           Off

                  NPU enabled                   SW1/7            On

                   NPU disabled                  SW1/7           Off

                  Bus mouse enabled             SW1/8            On

                   Bus mouse disabled            SW1/8           Off

                  Base memory size select       SW1/9            On
                   640KB

                   Base memory size select       SW1/9           Off
                   512KB

                  Factory configured - do       SW1/10          Off
                   not alter

                   Notes: Serial parallel ports are located on the
                   proprietary serial/parallel card.

      MEMORY READ SPEED CONFIGURATION

  Wait states       18F3          19F1

       0           Closed        Closed

       1            Open         Closed

       2           Closed         Open

       3            Open          Open

SYSTEM MEMORY CARD (G8FHW)

[Image]

                            DRAM CONFIGURATION

  Size     Bank    Bank    Bank    Bank     Bank    Bank    Bank     Bank
            0       1       2       3        4       5       6        7

  2MB      2MB    NONE     NONE    NONE    NONE    NONE     NONE    NONE

  4MB      2MB     2MB     NONE    NONE    NONE    NONE     NONE    NONE

  6MB      2MB     2MB     2MB     NONE    NONE    NONE     NONE    NONE

  8MB      2MB     2MB     2MB     2MB     NONE    NONE     NONE    NONE

  10MB     2MB     2MB     2MB     2MB      2MB    NONE     NONE    NONE

  12MB     2MB     2MB     2MB     2MB      2MB     2MB     NONE    NONE

  14MB     2MB     2MB     2MB     2MB      2MB     2MB     2MB     NONE

  16MB     2MB     2MB     2MB     2MB      2MB     2MB     2MB      2MB

  Note: Location of Bank 0 is unidentified. Banks are filled with
  proprietary 2MB memory modules (NEC part # 13-260131-502-A). Either a
  proprietary system memory card or a proprietary memory bus expansion
  card may be installed at J8. The proprietary memory bus expansion card
  has four slots that may be populated by up to four 2MB expansion cards.

