
AMPRO COMPUTERS, INC.

LITTLE BOARD/486

Processor           80486SX/80487SX/80486DX
Processor Speed     20/33MHz
Chip Set            Ampro
Max. onboard DRAM   16MB
Cache               32KB optional (location unknown)
BIOS                Award
Dimensions          330mm x 218mm
I/O Options         Floppy drive interface, IDE interface, parallel port,
                    SCSI connector, serial ports (2)
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power connector             J1       Parallel port               J6

  Serial port (COM2)          J2       SCSI interface              J7

  Serial port (COM1)          J3       Floppy drive interface      J8

  Utility connector           J4       IDE interface               J11

  Keyboard                    J5       Power J1-1 to +12V BUS      W7

                        USER CONFIGURABLE SETTINGS

               Function                  Jumper/Switch        Position

     SCSI controller enabled                  W1              Closed

      SCSI controller disabled                 W1               Open

     Factory configured - do not              W3                N/A
      alter

     SCSI controller select IRQ15             W5               Open

      SCSI controller select IRQ11             W5              Closed

     SCSI termination power enabled           W6               Open

      SCSI termination power                   W6              Closed
      disabled

     Factory configured - do not             W10              Closed
      alter

     Factory configured - do not             W11             pins 1 & 2
      alter                                                    closed

     Flash EPROM programming power           W16               Open
      enabled

      Flash EPROm programming power           W16              Closed
      disabled

     Watchdog timer select I/O CHCK          W17             pins 1 & 2
                                                               closed

      Watchdog timer select reset             W17             pins 2 & 3
                                                               closed

      Watchdog timer disabled                 W17               Open

     Floppy drive interface enabled          W18               Open

      Floppy drive interface                  W18              Closed
      disabled

     Floppy precompensation (PCVAL)          W19               Open
      selection

      Floppy precompensation (PCVAL)          W19              Closed
      none

     Floppy drive select IRQ6             W20 & W27           Closed

      Floppy drive select IRQ6             W20 & W27            Open
      disabled

     External cache enabled                  W21               Open

      External cache disabled                 W21              Closed

     Factory configured - do not             W22                N/A
      alter

     Power fail NMI enabled                  W23               Open

      Power fail NMI disabled                 W23              Closed

     Parallel port interrrupt                W24               Open
      option select via setup

      Parallel port interrrupt                W24              Closed
      option disabled

  Note: W18 may either be an option or is not user configurable.

       DRAM CONFIGURATION

      Size          Bank 0

      1MB        (4) 256K x 9

      4MB         (4) 1M x 9

      16MB        (4) 4M x 9

                            CACHE CONFIGURATION

    Cache         DRAM         U9         U10       Tag U12     Tag U13

     32KB         4MB       (2) 8K x    (2) 8K x    (2) 8K x      NONE
                               8           8           8

     32KB         16MB      (2) 8K x    (2) 8K x    (2) 8K x   (2) 8K x 8
                               8           8           8

                         EPROM CONFIGURATION (S0)

      EPROM              W8                  W9                  W25

      27C256            Open         pins 7 & 8, 10 & 11      pins 1 & 2

      27C512            Open        pins 1 & 4, 7 & 8, 10     pins 1 & 2
                                            & 11

      27C010            Open        pins 1 & 4, 2 & 5, 6 &    pins 1 & 2
                                          9, 7 & 8

      27C020            Open        pins 1 & 4, 2 & 5, 6 &    pins 1 & 2
                                      9, 7 & 8, 11 & 12

      27C040            Open        pins 1 & 4, 2 & 3, 6 &    pins 1 & 2
                                      9, 7 & 8, 11 & 12

      27C080           Closed       pins 1 & 4, 2 & 3, 7 &    pins 1 & 2
                                         8, 11 & 12

      62256             Open        pins 4 & 7, 5 & 8, 10     pins 1 & 2
                                            & 11               or 2 & 3

      628128            Open        pins 1 & 2, 4 & 7, 5 &    pins 1 & 2
                                         8, 10 & 11            or 2 & 3

    uPD434000           Open        pins 1 & 2, 3 & 6, 4 &    pins 1 & 2
                                      7, 5 & 8, 11 & 12        or 2 & 3

      28F256            Open        pins 2 & 5, 6 & 9, 7 &    pins 1 & 2
                                              8

      28F512            Open        pins 1 & 4, 2 & 5, 6 &    pins 1 & 2
                                          9, 7 & 8

      28F010            Open        pins 1 & 4, 2 & 5, 6 &    pins 1 & 2
                                          9, 7 & 8

      28F020            Open        pins 1 & 4, 2 & 5, 6 &    pins 1 & 2
                                      9, 7 & 8, 11 & 12

  Note:Pins designated should be in the closed position.

                 EPROM/FLASH EPROM CONFIGURATION (S1 & S2)

    EPROM          W12            W13            W14             W15

    128KB       pins 2 & 3     pins 2 & 3     pins 2 & 3      pins 2 & 3
                 closed          closed         closed         closed

    256KB       pins 2 & 3     pins 2 & 3     pins 2 & 3      pins 2 & 3
                 closed          closed         closed         closed

                SCSI CONTROLLER CONFIGURATION

         DMA                  W2                   W4

          6            pins 1 & 2 closed          Open

          0            pins 2 & 3 closed         Closed

                 UTILITY CONNECTOR (J4) PIN CONFIGURATION

      Pin               Signal Name                    Function

       1                  Speaker                    Audio signal

       2                  Speaker                       Ground

       3                   Ground             To one side of Reset button

       4                   Reset                 To other side of Reset
                                                        button

       5                LED Cathode                  Ground return

       6                 LED anode            Current source (+5v through
                                                       330 ohms)

       7                   Ground                    Ground return

       8                 +12V power             Connected to P1 pin B9

       9                 -5V power              Connected to P1 pin B5

       10                -12V power             Connected to P1 pin B7

       11                  Ground                    Ground return

       12                POWERGOOD                Power supply status

                       WATCHDOG TIMER CONFIGURATION

         Setting                     W17                     W23

         Disabled                   Open                     Open

       IOCHCK (NMI)           Pins 1 & 2 closed              Open

          Reset               pins 2 & 3 closed              N/A

  Note:I/O channel check is the bus signal that triggers a non-maskable
  interrupt (NMI)

  Reset is a hard reset signal, the same as pressing the reset button.

