
EPSON, INC.

EQUITY 486SX/25 PLUS

Processor             80486SX/80487SX
Processor Speed       25Mhz
Chip Set              Epson
Max. Onboard DRAM     16MB
Cache                 32KB
BIOS                  Epson
Dimensions            355mm x 304mm
I/O Options           32-bit external memory card, floppy drive interface,
                      IDE interface,

                      parallel port, PS/2 mouse port, serial port, VGA port
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                  Location

  PS/2 mouse port          CN1        Case connector block       CN13

  VGA port                 CN3        Floppy drive               CN15
                                      interface

  Serial port              CN4        IDE interface LED          CN16

  Parallel port            CN5        32-bit external            CN19
                                      memory card slot

  Hard drive LED          CN11        Chassis fan power          CN21

  Speaker                 CN12

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP1           pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP2           pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP3           pins 2 & 3
      alter                                                   closed

     On-board VGA adapter enabled            JP4           pins 1 & 2
                                                              closed

      On-board VGA adapter disabled           JP4           pins 2 & 3
                                                              closed

     Password enabled                        JP5           pins 1 & 2
                                                              closed

      Password disabled                       JP5           pins 2 & 3
                                                              closed

     Monitor type select color               JP6           pins 1 & 2
                                                              closed

      Monitor type select monochrome          JP6           pins 2 & 3
                                                              closed

     Mouse port enabled                      JP7           pins 1 & 2
                                                              closed

      Mouse port disabled                     JP7           pins 2 & 3
                                                              closed

     Normal IOCHRDY signal enabled           JP15          pins 1 & 2
                                                              closed

      Early IOCHRDY signal enabled            JP15          pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

  Size    Bank   Bank    Bank    Bank   JP8    JP9   JP10    JP11   JP12
           0      1       2       3

  4MB     (4)    NONE    NONE   NONE    2 &    2 &    2 &    2 &    1 & 2
          4M x                           3     3      3       3
           9

  8MB     (4)     (4)    NONE   NONE    2 &    2 &    2 &    1 &    1 & 2
          4M x   4M x                    3     3      3       2
           9      9

  9MB     (4)     (4)     (4)   NONE    1 &    2 &    2 &    1 &    1 & 2
          4M x   4M x    1M x            2     3      3       2
           9      9       9

  10MB    (4)     (4)     (4)    (4)    1 &    1 &    2 &    1 &    1 & 2
          4M x   4M x    1M x    1M x    2     2      3       2
           9      9       9       9

  12MB    (4)     (4)     (4)   NONE    1 &    2 &    1 &    1 &    1 & 2
          4M x   4M x    4M x            2     3      2       2
           9      9       9

  16MB    (4)     (4)     (4)    (4)    1 &    1 &    1 &    1 &    1 & 2
          4M x   4M x    4M x    4M x    2     2      2       2
           9      9       9       9

  Note:Pins designated should be in the closed position.

  Banks 0 - 3 are located on the external memory card.

                  BASE MEMORY CONFIGURATION

        Size                 JP13                 JP14

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

        512KB          pins 2 & 3 closed   pins 1 & 2 closed

        640KB          pins 1 & 2 closed   pins 1 & 2 closed

                          CPU TYPE CONFIGURATION

       CPU                JP1               JP2                JP3

     80486SX           pins 2 & 3        pins 2 & 3         pins 2 & 3
                        closed             closed             closed

     80487SX           pins 1 & 2        pins 1 & 2         pins 1 & 2
                        closed             closed             closed

