JC INFORMATION SYSTEMS CORPORATION

HIGH PERFORMANCE 486 SX/DX (MODEL 2270)

Processor              80486SX/80486DX/80486DX2
Processor Speed        25/33/40/50/50(internal)/66(internal)MHz
Chip Set               Unidentified
Video Chip Set         None
Maximum Onboard Memory 64MB
Maximum Video Memory   None
Cache                  64/256KB
BIOS                   AMI
Dimensions             254mm x 218mm
I/O Options            32-bit VESA local bus slots (2)
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J1        Turbo LED                 JP20

  Power LED & keylock         J20       Reset switch               S1

  Speaker                     JP9       32-bit VESA local      SL1 & SL2
                                        bus slots

  Turbo switch               JP19

                        USER CONFIGURABLE SETTINGS

                Function                    Label          Position

  »   CMOS memory normal operation           JP1       Pins 2 & 3 closed

      CMOS memory clear                      JP1       Pins 1 & 2 closed

      External battery installed at J1       JP1             Open

      Monitor type select                    JP2             Open
      monochrome/EGA

      Monitor type select CGA                JP2            Closed

  »   Factory configured - do not           JP10            Closed
      alter

      Jumper information unavailable        JP11         Unidentified

      Jumper information unavailable        JP12         Unidentified

  »   Factory configured - do not           JP21             Open
      alter

  »   Factory configured - do not           JP22             Open
      alter

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       None

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         None

      5MB         (4) 1M x 9     (4) 256K x 9

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

      16MB        (4) 4M x 9         None

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

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

      64MB        (4) 16M x 9        None

                  CACHE CONFIGURATION

       Size             Bank 0             Bank 1

       64KB           (4) 8K x 8         (4) 8K x 8

      256KB           (4) 32K x 8       (4) 32K x 8

  Note: The location of banks 0 & 1 are unidentified.

                        CACHE JUMPER CONFIGURATION

     Size           JP3            JP4            JP17           JP18

     64KB        Pins 2 & 3     Pins 2 & 3        Open           Open
                  closed          closed

    128KB        Pins 1 & 2     Pins 1 & 2       Closed          Open
                  closed          closed

    256KB        Pins 2 & 3     Pins 2 & 3       Closed         Closed
                  closed          closed

           CPU SPEED SELECTION

  Speed      JP5        JP6       JP7

  25MHz      Open      Open     Closed

  33MHz     Closed     Open      Open

  40MHz     Closed    Closed     Open

  50iMHz     Open      Open     Closed

  50MHz      Open     Closed     Open

  66iMHz    Closed     Open      Open

                            CPU TYPE SELECTION

     Type         JP8        JP13        JP14         JP15        JP16

    80486SX      2 & 3       Open       2 & 3         Open        Open

    80486DX      2 & 3       1 & 2      1 & 2        Closed       Open

            Note: Pins designated should be in the closed position. If
            PQFP is installed, JP8 must be set to 1 & 2 and JP16 must be
            closed if an 80486DX or 80486DX2 is installed