
MICRONICS COMPUTERS, INC.

TWISTER AT (REV. 1B)

Device Type       Mainboard
Processor         CX 6x86/AM K5/AM K6/Pentium
Processor Speed   75/90/100/120/133/150/166/180/200/233MHz
Chip Set          Intel 430TX
Video Chip Set    None
Maximum Onboard   256MB (EDO & SDRAM supported)
Memory
Maximum Video     None
Memory
Cache             256/512KB
BIOS              Award
Dimensions        330mm x 218mm
I/O Options       32-bit PCI slots (5), floppy drive interface, green PC
                  connector, IDE interfaces (2), parallel port, PS/2 mouse
                  interface, serial ports (2), IR connector, USB
                  connectors (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  USB connector 1          J10         Green PC connector  J23/pins 3 & 4

  USB connector 2          J11         IR connector         J23/pins 6 -
                                                                 10

  IDE interface 2          J13         IDE interface LED    J23/pins 13 -
                                                                 16

  Serial port 2            J14         Power LED            J23/pins 18 -
                                                                 20

  IDE interface 1          J15         Reset switch         J23/pins 22 &
                                                                 23

  Floppy drive             J16         Speaker              J23/pins 24 -
  interface                                                      27

  Parallel port            J17         Power LED &              J24
                                       keylock

  Chassis fan power        J18         SCSI interface LED       J101

  PS/2 mouse               J19         32-bit PCI slots      PC1 - PC5
  interface

  Serial port 1            J22

  USER CONFIGURABLE SETTINGS

  Function                                Label          Position

  ?   CMOS memory normal operation        JP1            Pins 1 & 2
                                                         closed

      CMOS memory clear                   JP1            Pins 2 & 3
                                                         closed

      Flash BIOS normal operation         JP2            Pins 2 & 3
                                                         closed

      Flash BIOS reserved                 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

     128MB        (2) 16M x 36       None

     136MB        (2) 16M x 36   (2) 1M x 36

     144MB        (2) 16M x 36   (2) 2M x 36

     160MB        (2) 16M x 36   (2) 4M x 36

     192MB        (2) 16M x 36   (2) 8M x 36

     256MB        (2) 16M x 36   (2) 16M x 36

  Note: Board accepts EDO & SDRAM memory..

  DIMM CONFIGURATION

  Size                     Bank 2                  Bank 3

  8MB                      (1) 1M x 64             None

  16MB                     (1) 2M x 64             None

  16MB                     (1) 1M x 64             (1) 1M x 64

  24MB                     (1) 2M x 64             (1) 1M x 64

  32MB                     (1) 4M x 64             None

  32MB                     (1) 2M x 64             (1) 2M x 64

  40MB                     (1) 1M x 64             (1) 4M x 64

  48MB                     (1) 2M x 64             (1) 4M x 64

  64MB                     (1) 8M x 64             None

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

  72MB                     (1) 1M x 64             (1) 8M x 64

  80MB                     (1) 2M x 64             (1) 8M x 64

  96MB                     (1) 4M x 64             (1) 8M x 64

  128MB                    (1) 8M x 64             (1) 8M x 64

  256MB                    (1) 16M x 64            (1) 16M x 64

  Note: Board accepts EDO & SDRAM memory. Banks 2 & 3 are
  interchangeable.

                 CACHE CONFIGURATION

           Size                     Bank 0

          256KB                  (2) 32K x 32

          512KB                  (2) 64K x 32

  Note: The location of the cache is unidentified.

  CPU SPEED SELECTION (CYRIX)

  CPU       Clock    Multiplier    JP4    JP5   JP6    JP7   JP8    JP60
  speed     speed

  150MHz    50MHz    2x            1 &    2 &   2 &    2 &   1 &    Open
                                   2      3     3      3     2

  166MHz    60MHz    2x            1 &    2 &   2 &    1 &   2 &    Open
                                   2      3     3      2     3

  Note: Pins designated should be in the closed position.

                       CPU SPEED SELECTION (AMD K5)

    CPU      Clock   Multiplier     JP4   JP5    JP6   JP7    JP8   JP60
  speed     speed

  75MHz     50MHz       1.5x        1 &   1 &    2 &   2 &    2 &   Open
                                    2      2     3      3     3

  90MHz     60MHz       1.5x        1 &   1 &    2 &   2 &    1 &   Open
                                    2      2     3      3     2

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

  120MHz    60MHz       1.5x        1 &   1 &    2 &   2 &    1 &   Open
                                    2      2     3      3     2

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

  166MHz    66MHz       2.5x        2 &   2 &    2 &   1 &    2 &   Open
                                    3      3     3      2     3

  Note: Pins designated should be in the closed position.

  CPU SPEED SELECTION (AMD K6)

  CPU       Clock    Multiplier    JP4    JP5   JP6    JP7   JP8    JP60
  speed     speed

  166MHz    66MHz    2.5x          2 &    2 &   2 &    1 &   2 &    Open
                                   3      3     3      2     3

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

  233MHz    66MHz    3.5x          1 &    1 &   2 &    1 &   2 &    1 & 2
                                   2      2     3      2     3

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

    CPU      Clock   Multiplier     JP4   JP5    JP6   JP7    JP8   JP60
  speed     speed

  75MHz     50MHz       1.5x        1 &   1 &    2 &   2 &    2 &   Open
                                    2      2     3      3     3

  90MHz     60MHz       1.5x        1 &   1 &    2 &   2 &    1 &   Open
                                    2      2     3      3     2

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

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

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

  150MHz    60MHz       2.5x        2 &   2 &    2 &   2 &    1 &   Open
                                    3      3     3      3     2

  166MHz    66MHz       2.5x        2 &   2 &    2 &   1 &    2 &   Open
                                    3      3     3      2     3

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

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

  233MHz    66MHz       3.5x        1 &   1 &    2 &   1 &    2 &   Open
                                    2      2     3      2     3

  Note: Pins designated should be in the closed position.

  CPU TYPE SELECTION

  Type      JP11    JP12     JP13     JP14     JP16   JP17     JP18   JP19

  CX6X86    Open    Closed   Open     Open     Open   Closed   Open   Open

  CX6X86L   Open    Open     Open     Closed   Open   Closed   Open   Open

  AM K5     Open    Open     Closed   Open     Open   Closed   Open   Open

  AM K6     Open    Open     Open     Closed   Open   Closed   Open   Open

  AM K6     Closed  Open     Open     Open     Open   Closed   Open   Open
  233MHz

  P54C      Open    Closed   Open     Open     Open   Closed   Open   Open

  P54CS     Open    Closed   Open     Open     Open   Closed   Open   Open

  P54CTB    Open    Closed   Open     Open     Open   Closed   Open   Open

  P55C      Open    Open     Open     Closed   Open   Closed   Open   Open

