ACER, INC.

ACERALTOS 300 (M1A), M1A

Device Type              Mainboard
Processor                CX M1/AM K5/Pentium
Processor Speed          75/90/100/120/133MHz
Chip Set                 OPTI
Video Chip Set           Unidentified
Maximum Onboard Memory   128MB (EDO supported)
Maximum Video Memory     2MB
Cache                    256KB
BIOS                     Acer
Dimensions               330mm x 218mm
I/O Options              Ethernet 10BaseT connector, floppy drive
                         interface, green PC connector, IDE interfaces (2),
                         SCSI interface, parallel port, PS/2 mouse port,
                         serial ports (2), VGA feature connector, VGA port,
                         riser slot

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                Location

  VGA port                 C1         SCSI interface           CN10

  Parallel port            C2         Power LED &              CN11
                                      keylock

  Serial port 2            C3         Power LED &         CN12/pins 1 – 4
                                      keylock

  Serial port 1            C4         Reset switch        CN12/pins 6 & 7

  PS/2 mouse port          C5         IDE interface LED        CN13

  Ethernet 10BaseT         C6         Speaker                  CN14
  connector

  Chassis fan power        C7         Power LED &         CN15/pins 1 – 5
                                      keylock

  Chassis fan power        C8         Speaker              CN15/pins 7 –
                                                                10

  AUI interface            CN4        Turbo LED            CN15/pins 12 &
                                                                13

  VGA feature              CN5        Turbo switch         CN15/pins 15 –
  connector                                                     17

  Floppy drive             CN6        Reset switch         CN15/pins 19 &
  interface                                                     20

  IDE interface 2          CN7        Riser slot                SL1

  IDE interface 1          CN8

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

  »   Factory configured - do not          CN16          Unidentified
      alter

  »   BIOS type select Acer                 JP1        Pins 1 & 2 closed

      BIOS type select OEM                  JP1        Pins 2 & 3 closed

  »   Password disabled                     JP2        Pins 2 & 3 closed

      Password enabled                      JP2        Pins 1 & 2 closed

             SIMM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (2) 1M x 36      None

     16MB        (2) 2M x 36      None

     16MB        (2) 1M x 36   (2) 1M x 36

     24MB        (2) 2M x 36   (2) 1M x 36

     32MB        (2) 4M x 36      None

     32MB        (2) 2M x 36   (2) 2M x 36

     40MB        (2) 4M x 36   (2) 1M x 36

     48MB        (2) 4M x 36   (2) 2M x 36

     64MB        (2) 8M x 36      None

     64MB        (2) 4M x 36   (2) 4M x 36

     72MB        (2) 8M x 36   (2) 1M x 36

     80MB        (2) 8M x 36   (2) 2M x 36

     96MB        (2) 8M x 36   (2) 4M x 36

     128MB       (2) 8M x 36   (2) 8M x 36

  Note: Board accepts EDO memory.

                         SIMM JUMPER CONFIGURATION

           Type                      JP9                    JP14

  »          Normal           Pins 1 & 2 closed       Pins 1 & 2 closed

              EDO             Pins 2 & 3 closed       Pins 2 & 3 closed

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

     256KB           None         (8) 32K x 8     (1) 8K x 8

     256KB       (2) 32K x 32        None        (1) 32K x 8

            VIDEO MEMORY CONFIGURATION

      Size            Bank 0           Bank 1

       1MB        (2) 256K x 16         None

       2MB        (2) 256K x 16    (2) 256K x 16

                        CPU SPEED SELECTION (CX M1)

  CPU speed    Clock speed    Multiplier      JP5        JP8       JX1

    120MHz        60MHz           2x         1 & 2      2 & 3     1 & 2

    133MHz        66MHz           2x         2 & 3      2 & 3     1 & 2

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (AM K5)

  CPU speed       Clock      Multiplier       JP5        JP8        JX1
                  speed

    75MHz         50MHz         1.5x         Open       1 & 2      1 & 2

    90MHz         60MHz         1.5x         1 & 2      1 & 2      1 & 2

    100MHz        66MHz         1.5x         2 & 3      1 & 2      1 & 2

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

  CPU speed       Clock      Multiplier       JP5        JP8        JX1
                  speed

    75MHz         50MHz         1.5x         Open       1 & 2      1 & 2

    90MHz         60MHz         1.5x         1 & 2      1 & 2      1 & 2

    100MHz        66MHz         1.5x         2 & 3      1 & 2      1 & 2

    120MHz        60MHz          2x          1 & 2      2 & 3      1 & 2

    133MHz        66MHz          2x          2 & 3      2 & 3      1 & 2

  Note: Pins designated should be in the closed position.

               CPU TYPE SELECTION

   Type      JP10     JP11      JP12      JP13

  AM K5     Closed   Closed     Open     Closed

  CX M1      Open     Open      Open      Open

  Intel     Closed   Closed    Closed    Closed

          CPU VOLTAGE SELECTION

       Voltage               JP7

         VR           Pins 1 & 2 closed

         VRE          Pins 2 & 3 closed