
NOVACOR, INC.

OPTimum EISA486SD - 6A5B1

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/40/50MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
SRAM Cache        64/128/256/512KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J4       Reset switch               S9

  Power LED & keylock          J5

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                JP4            closed

      Monitor type select monochrome           JP4             open

      CPU speed select iOCS/1                  JP8           pins 1 & 2
                                                              closed

      CPU speed select iOCS/2                  JP8           pins 2 & 3
                                                              closed

           DRAM CONFIGURATION

  Size       Bank 0          Bank 1

  4MB      (4) 1M x 9         NONE

  8MB      (4) 1M x 9      (4) 1M x 9

  16MB     (4) 4M x 9         NONE

  20MB     (4) 1M x 9      (4) 4M x 9

  32MB     (4) 4M x 9      (4) 4M x 9

                          CPU TYPE CONFIGURATION

     CPU                    JP7                           JP9

   80486DX      pins 1 & 2 and 3 & 4 closed        pins 2 & 3 closed

   80487SX      pins 1 & 2 and 3 & 4 closed        pins 1 & 2 closed

   80486SX           pins 2 & 3 closed                   open

                          CPU SPEED CONFIGURATION

    Speed          JP1            JP2            JP3             JP6

    50MHz         closed         closed       pins 1 & 2         open
                                                closed

    40MHz          open          closed       pins 1 & 2         open
                                                closed

    33MHz         closed          open        pins 1 & 2         open
                                                closed

    25MHz          open           open        pins 1 & 2         open
                                                closed

    20MHz          open           open        pins 2 & 3        closed
                                                closed

                         SRAM JUMPER CONFIGURATION

  Size      JP5      JP10     JP11      JP12     JP13     JP14      JP15

  64KB     pins 2    open     open      open     open     open      open
            & 3
          closed

  128KB    pins 1    open     open     closed    open     closed    open
            & 2
          closed

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

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

                            SRAM CONFIGURATION

   Size        Cache      Location     TAG (U50)   TAG (U51)    Dirty bit
               SRAM                                              (U64)

   64KB      (8) 8K x    Banks 0 & 1    (1) 8K x      N/A       (1) 16K x
                8                          8                       1

   128KB      (4) 32K      Bank 0       (1) 8K x      N/A       (1) 16K x
               x 8                         8                       1

   256KB      (8) 32K    Banks 0 & 1    (1) 8K x    (1) 8K x    (1) 16K x
               x 8                         8           8           1

   512KB     (4) 128K      Bank 0      (1) 32K x      N/A       (1) 64K x
               x 8                         8                       1

  Note:Dirty bit (U64) can always accommodate (1) 64K x 1 for any of the
  four configurations.

