
VTECH INDUSTRIES, INC.

MB520N

Processor           CX M1/AM K5/Pentium
Processor Speed     75/90/100/120/133/150/166/180/200MHz
Chip Set            Intel
Video Chip Set      None
Maximum Onboard     128MB (EDO supported)
Memory
Maximum Video       None
Memory
Cache               256/512KB
BIOS                AMI
Dimensions          230mm x 220mm
I/O Options         32-bit PCI slots (4), floppy drive interface, green PC
                    connector, IDE interfaces (2), parallel port, PS/2
                    mouse interface, serial ports (2), IR connector, USB
                    connector
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Floppy drive interface     CN1       Parallel port               J9

  IDE interface 2            CN2       IR connector               J10

  IDE interface 1            CN3       Speaker                    J11

  USB connector               J1       IDE interface LED          JP14

  PS/2 mouse interface        J2       Green PC connector         JP15

  Power LED & keylock         J3       Chassis fan power          JP18

  Serial port 2               J6       Reset switch               JP19

  Serial port 1               J7       32-bit PCI slots         PC1  PC4

                        USER CONFIGURABLE SETTINGS

                  Function                      Label         Position

      Flash BIOS type select                     JP9         Pins 1 & 2
      SST/Winbond/ATMEL/MX                                     closed

      Flash BIOS type select Intel               JP9         Pins 2 & 3
                                                               closed

      Flash BIOS voltage select 12v              JP10        Pins 2 & 3
                                                               closed

      Flash BIOS voltage select 5v               JP10        Pins 1 & 2
                                                               closed

     CMOS memory normal operation               JP16           Open

      CMOS memory clear                          JP16          Closed

                      DRAM 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. Banks are interchangeable.

                            CACHE CONFIGURATION

  Note: The location of the banks is unidentified. The size of the chips
  is unidentified.

                         CPU SPEED SELECTION (AMD)

    CPU       Clock     Multiplier    JP2     JP3      JP6         JP7
   speed     speed

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

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

  100MHz     66MHz         1.5x       1 & 2   1 & 2    Open      Closed

  120MHz     60MHz         1.5x       1 & 2   1 & 2   Closed      Open

  133MHz     66MHz         1.5x       1 & 2   1 & 2    Open      Closed

  150MHz     60MHz          2x        1 & 2   2 & 3   Closed      Open

  166MHz     66MHz          2x        1 & 2   2 & 3    Open      Closed

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (CYRIX)

    CPU       Clock     Multiplier    JP2     JP3      JP6         JP7
   speed     speed

  120MHz     50MHz          2x        1 & 2   2 & 3   Closed     Closed

  133MHz     55MHz          2x        1 & 2   2 & 3    Open       Open

  150MHz     60MHz          2x        1 & 2   2 & 3   Closed      Open

  166MHz     66MHz          2x        1 & 2   2 & 3    Open      Closed

  200MHz     50MHz         1.5x       1 & 2   1 & 2   Closed     Closed

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

    CPU       Clock     Multiplier    JP2     JP3      JP6         JP7
   speed     speed

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

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

  100MHz     66MHz         1.5x       1 & 2   1 & 2    Open      Closed

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

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

  150MHz     60MHz         2.5x       2 & 3   2 & 3   Closed      Open

  166MHz     66MHz         2.5x       2 & 3   2 & 3    Open      Closed

  180MHz     60MHz          3x        2 & 3   1 & 2   Closed      Open

  200MHz     66MHz          3x        2 & 3   1 & 2    Open      Closed

  Note: Pins designated should be in the closed position.

                            CPU TYPE SELECTION

    Type           J13            J14            J15             J16

   CX 6X86      Pins 2 & 3     Pins 2 & 3     Pins 2 & 3      Pins 2 & 3
                 closed          closed         closed         closed

  AM K5 (B,     Pins 2 & 3     Pins 2 & 3     Pins 2 & 3      Pins 2 & 3
    C, F)        closed          closed         closed         closed

  AM K5 (H,     Pins 1 & 2     Pins 1 & 2     Pins 1 & 2      Pins 1 & 2
    J, K)        closed          closed         closed         closed

    P54C        Pins 2 & 3     Pins 2 & 3     Pins 2 & 3      Pins 2 & 3
                 closed          closed         closed         closed

    P55C        Pins 1 & 2     Pins 1 & 2     Pins 1 & 2      Pins 1 & 2
                 closed          closed         closed         closed

                 CPU VOLTAGE SELECTION (SINGLE)

       Voltage                 JP5                  JP17

        3.38v           Pins 7 & 8 closed     Pins 2 & 3 closed

        3.52v          Pins 9 & 10 closed     Pins 1 & 2 closed

                       CPU VOLTAGE SELECTION (DUAL)

      Voltage           V core             JP5                JP17

       3.38v             2.5v           Pins 1 & 2      Pins 2 & 3 closed
                                          closed

       3.38v             2.7v           Pins 3 & 4      Pins 2 & 3 closed
                                          closed

       3.38v             2.93v          Pins 5 & 6      Pins 2 & 3 closed
                                          closed

       3.52v             2.5v           Pins 1 & 2      Pins 1 & 2 closed
                                          closed

       3.52v             2.7v           Pins 3 & 4      Pins 1 & 2 closed
                                          closed

       3.52v             2.93v          Pins 5 & 6      Pins 1 & 2 closed
                                          closed

