
EPSON, INC.

EQUITY 4 SERIES

Processor       80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 20/25/33/50(internal)/66(internal) MHz
Chip Set        Toshiba
Max. Onboard    32MB
DRAM
SRAM Cache      None
BIOS            Award
Dimensions      330mm x 218mm
I/O Options     Floppy drive interface, IDE interface, parallel port, PS/2
                mouse port, PS/2 keyboard connector, proprietary riser
                card, serial port (2), VGA feature connector, VGA port
NPU Options     None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  PS/2 mouse port            CN2       Reserved for future use    CN11

  PS/2 keyboard              CN3       Speaker                    CN12

  Serial port 2              CN4       Reserved for future use    CN13

  Serial port 1              CN5       Reserved for future use    CN14

  Parallel port              CN6       Reserved for future use    CN15

  VGA port                   CN7       IDE interface LED          CN16

  VGA feature connector      CN8       Power LED                  CN17

  Floppy drive interface     CN9       Proprietary riser card     SLOT1

  IDE interface              CN10

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select monochrome           J5              Open

      Monitor type select color                J5             Closed

     Onboard video enabled                    J6            pins 1 & 2
                                                              closed

      Onboard video disabled                   J6            pins 2 & 3
                                                              closed

     CMOS memory normal operation             J7              Open

      CMOS memory clear                        J7             Closed

     Factory configured - do not alter        J8            pins 1 & 2
                                                              closed

     Factory configured - do not alter        J13           pins 2 & 3
                                                              closed

     Factory configured - do not alter        J14           pins 2 & 3
                                                              closed

     Factory configured - do not alter        J15           pins 2 & 3
                                                              closed

     Fast Gate A20 enabled                    J18           pins 1 & 2
                                                              closed

      Fast Gate A20 disabled                   J18           pins 2 & 3
                                                              closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB        (1) 256K x 36         NONE

       2MB        (1) 256K x 36    (1) 256K x 36

       4MB         (1) 1M x 36          NONE

       5MB        (1) 256K x 36     (1) 1M x 36

       8MB         (1) 1M x 36      (1) 1M x 36

      16MB         (1) 4M x 36          NONE

      17MB        (1) 256K x 36     (1) 4M x 36

      20MB         (1) 1M x 36      (1) 4M x 36

      32MB         (1) 4M x 36      (1) 4M x 36

                       CPU SPEED CONFIGURATION

    Speed          J19           J20          J21           J22

    20MHz        Closed         Open         Closed         Open

  25/50i MHz      Open          Open         Closed         Open

  33/66i MHz     Closed         Open          Open          Open

                          CPU TYPE CONFIGURATION

      CPU          Type        J10         J11         J12         J23

    80486SX        PQFP      pins 1 &    pins 1 &    pins 2 &    pins 1 &
                                2           2           3           2

    80486SX        PGA       pins 2 &    pins 2 &     Open       pins 2 &
                                3           3                       3

    80487SX        PGA       pins 1 &    pins 1 &    pins 2 &    pins 2 &
                                2           2           3           3

    80486DX        PGA       pins 1 &    pins 1 &    pins 1 &    pins 2 &
                                2           2           2           3

  Note:Pins designated should be in the closed position.

