
ACER, INC.

ACERPOWER 486 (V20 PROJECT)

Processor  80486SX/80486SX2/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor  25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       64MB
Onboard
DRAM
Cache      128/256/512KB
BIOS       Acer
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slot, 32-bit PCI slots (3), green PC
Options    connector, PS/2 mouse port
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse port            CN1       32-bit VESA local bus      SL1
                                       slot

  32-bit PCI slots        PC1 - PC3

                        USER CONFIGURABLE SETTINGS

              Function                   Jumper            Position

     Factory configured - do not          CN8                N/A
      alter

     Factory configured - do not          CN9                N/A
      alter

     Factory configured - do not         CN10                N/A
      alter

     Password enabled                     JP1         pins 1 & 2 closed

      Password disabled                    JP1         pins 2 & 3 closed

     BIOS type select Acer                JP2         pins 1 & 2 closed

      BIOS type select OEM                 JP2         pins 2 & 3 closed

     Factory configured - do not          JP3         pins 3 & 4 closed
      alter

     Factory configured - do not          JP4         pins 1 & 2, 3 & 4,
      alter                                              5 & 6 closed

      Factory configured - do not          JP6         pins 2 & 3 closed
      alter

     Factory configured - do not          JP7         pins 2 & 3 closed
      alter

     M5115 enabled                        JP8         pins 1 & 2 closed

      M5115 disabled                       JP8         pins 2 & 3 closed

     Factory configured - do not         JP10         pins 1 & 2 closed
      alter

     Local bus IDE I/O address           JP11         pins 1 & 2 closed
      select 0FXH

      Local bus IDE I/O address           JP11         pins 2 & 3 closed
      select 07XH

     Local bus IDE interface             JP12         pins 2 & 3 closed
      enabled

      Local bus IDE interface             JP12         pins 1 & 2 closed
      disabled

     Reset button enabled                JP23         pins 1 & 2 closed

      Reset button disabled               JP23         pins 2 & 3 closed

     Power saving feature disabled       JP24         pins 2 & 3 closed

      Power saving feature enabled        JP24         pins 1 & 2 closed

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     4MB        (1) 1M x 36       NONE           NONE          NONE

     8MB        (1) 1M x 36   (1) 1M x 36        NONE          NONE

     12MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36       NONE

     12MB       (1) 1M x 36       NONE       (1) 2M x 36       NONE

     16MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     16MB       (1) 2M x 36       NONE       (1) 2M x 36       NONE

     16MB       (1) 4M x 36       NONE           NONE          NONE

     32MB       (1) 4M x 36   (1) 4M x 36        NONE          NONE

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36       NONE

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

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

     512KB           NONE        (4) 128K x 8    (1) 32K x 8

  Note: The location of the TAG is unidentified.

                        CACHE JUMPER CONFIGURATION

      Size               J13               J15                 J16

      128KB           pins 2 & 3        pins 2 & 3      pins 1 & 2 closed
                       closed             closed

      256KB           pins 2 & 3        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

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

                    CPU TYPE CONFIGURATION

        Type                  JP9                 JP20

       80486SX         pins 2 & 3 closed    pins 1 & 2 closed

      80486SX2         pins 2 & 3 closed    pins 1 & 2 closed

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

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

      80486DX4         pins 2 & 3 closed    pins 1 & 2 closed

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

                    CPU TYPE CONFIGURATION

        Type                 JP26                 JP27

        Intel          pins 1 & 2 closed   pins 1 & 2 closed

         AMD           pins 2 & 3 closed   pins 2 & 3 closed

                   CPU SPEED CONFIGURATION

        Speed                JP17                 JP21

        25MHz          pins 1 & 5 closed   pins 2 & 3 closed

        33MHz          pins 2 & 6 closed   pins 2 & 3 closed

       50iMHz          pins 1 & 5 closed   pins 2 & 3 closed

       66iMHz          pins 2 & 6 closed   pins 2 & 3 closed

       75iMHz          pins 1 & 5 closed   pins 2 & 3 closed

       100iMHz         pins 2 & 6 closed   pins 2 & 3 closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP22

         2.0x           pins 1 & 2 closed

         2.5x           pins 2 & 3 closed

         3.0x           pins 3 & 4 closed

