
ACER, INC.

ISA486GSi MODEL IP25A

Processor         80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed   20/25/33/50(internal)/66(internal)
Chip Set          ALI
Max. Onboard DRAM 32MB
SRAM Cache        None
BIOS              Acer
Dimensions        220mm x 220mm
I/O Options       None
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                Location

  External battery            J3        Reset switch          J4/11 & 12

  Power LED & keylock      J4/1 - 5     Turbo switch          J4/14 - 16

  Speaker                 J4/7 - 10     Turbo LED             J4/18 & 19

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CMOS memory normal operation            JP1              open

      CMOS memory clear                       JP1             closed

     Battery select internal                 J3            pins 2 & 3
                                                              closed

      Battery select external                 J3            connected

                    CPU TYPE CONFIGURATION

         CPU                 JP6                  JP7

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

      ODP486SX               open          pins 1 & 2 closed

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

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

       80486SX               open          pins 1 & 2 closed

                          CPU SPEED CONFIGURATION

  CPU Speed       OSC1         JP8         JP9        JP10        JP11

    20MHz         40MHz      pins 2 &    pins 1 &    pins 1 &    pins 2 &
                                3           2           2           3

    25MHz         50MHz      pins 1 &    pins 2 &    pins 1 &    pins 2 &
                                2           3           2           3

    33MHz         66MHz      pins 1 &    pins 1 &    pins 1 &    pins 2 &
                                2           2           2           3

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

    60MHz         66MHz      pins 1 &    pins 1 &    pins 1 &    pins 2 &
                                2           2           2           3

  Note:Pins designated should be in the closed position.

              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

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

