
UNIDENTIFIED

ISA-486SV2

Processor        80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unidentified
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       254mm x 218mm
I/O Options      None
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery           BCON1     Reset switch               CON3

  Turbo switch               CON1      Speaker                    CON4

  Turbo LED                  CON2      Power LED & keylock        CON5

                        USER CONFIGURABLE SETTINGS

                 Function                      Jumper         Position

      Battery type select internal              BJP1         pins 1 & 2
                                                               closed

      Battery type select external              BJP1         pins 2 & 3
                                                               closed

      Monitor type select CGA                   JP2          pins 2 & 3
                                                               closed

      Monitor type select                       JP2          pins 1 & 2
      monochrome/EGA/VGA                                       closed

      CPU type select AMD/Intel                 JP22         pins 2 & 3
                                                               closed

      CPU type select Cyrix                     JP22         pins 1 & 2
                                                               closed

     Factory configured - do not alter         TP13         pins 1 & 2
                                                               closed

     Factory configured - do not alter         TP14         pins 1 & 2
                                                               closed

     Factory configured - do not alter         TP15         pins 1 & 2
                                                               closed

     Factory configured - do not alter         TP17         pins 2 & 3
                                                               closed

     Factory configured - do not alter         TP25             1D

     Factory configured - do not alter         TP26            Open

     Factory configured - do not alter         TP27             1D

  Note: The location of jumpers TP17, TP25, TP26 and TP27 are
  unidentified.

              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

      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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8

     128KB      (4) 32K x 8        NONE       (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size               CJ1                CJ2                CJ3

      64KB            pins 2 & 3         pins 2 & 3            Open
                       closed              closed

      128KB           pins 1 & 2            Open              Closed
                       closed

      256KB           pins 1 & 2         pins 1 & 2            Open
                       closed              closed

                          CPU TYPE CONFIGURATION

        Type               CPJ1              CPJ2              CPJ3

   80486SX (PQFP)     pins 1 & 2, 3 &     pins 1 & 2        pins 1 & 2
                         4 closed           closed            closed

   80486SX (PGA)         pins 2 & 3       pins 2 & 3           Open
                          closed            closed

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

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

      80486DX2        pins 1 & 2, 3 &     pins 2 & 3        pins 2 & 3
                         4 closed           closed            closed

  Pentium Overdrive   pins 1 & 2, 3 &     pins 1 & 2        pins 1 & 2
                         4 closed           closed            closed

  Note: See also JP22 in User Configurable Settings table.

                          CPU SPEED CONFIGURATION

      Speed              CS1                CS2                CS3

      20MHz           pins 1 & 2         pins 1 & 2         pins 1 & 2
                        closed            closed             closed

      25MHz           pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

      33MHz           pins 2 & 3         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

      40MHz           pins 1 & 2         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

      50iMHz          pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

      50MHz           pins 2 & 3         pins 1 & 2         pins 1 & 2
                        closed            closed             closed

      66iMHz          pins 2 & 3         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

