
DIGITAL EQUIPMENT CORPORATION

DIGITAL 21164

Processor                Alpha
Processor Speed          266/300/333MHz
Chip Set                 DEC
Video Chip Set           None
Maximum Onboard Memory   512MB
Maximum Video Memory     None
Cache                    2048/4096/8192KB
BIOS                     Unidentified
Dimensions               332mm x 307mm
I/O Options              64-bit PCI slots (2), 32-bit PCI slots (2),
                         floppy drive interface, IDE interface, parallel
                         port, PS/2 mouse port, serial ports (2), cache
                         slots (2)
NPU Options              None

[Image]

                                CONNECTIONS

  Purpose                Location        Purpose              Location

  Chassis fan         J2/pins 3 & 5      Serial port 1           J27
  power

  Chassis fan         J2/pins 7 & 9      IDE interface           J28
  power

  Halt connector      J2/pins 8 & 10     Floppy drive            J31
                                         interface

  Chassis fan        J2/pins 11 & 13     Parallel port           J33
  power

  Reset switch       J2/pins 12 & 14     PS/2 mouse port         J34

  IDE interface      J2/pins 15 & 17     64-bit PCI slots     PC1 & PC2
  LED

  Keylock            J2/pins 18 & 20     32-bit PCI slots     PC3 & PC4

  Speaker                 J2/pins        Cache slot              SL1
                       19,21,23,25

  Serial port 2            J26           Cache slot              SL2

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Factory configured - do not          J1/pins 9 &          N/A
      alter                                    10

     SROM test disabled                  J1/pins 23 &         Open
                                               24

      SROM test enabled                   J1/pins 23 &        Closed
                                               24

     Loaded image select alternate       J1/pins 25 &        Closed
      images loaded                            26

      Loaded image select first image     J1/pins 25 &         Open
      loaded                                   26

     Cache speed select nominal read     J1/pins 29 &         Open
      speed                                    30

      Cache speed select read speed 1     J1/pins 29 &        Closed
      cycle faster                             30

     Factory configured - do not         J1/pins 31 &          N/A
      alter                                    32

     Factory configured - do not         J1/pins 33 &          N/A
      alter                                    34

     Factory configured - do not         J1/pins 35 &          N/A
      alter                                    36

     Factory configured - do not         J1/pins 37 &          N/A
      alter                                    38

     Factory configured - do not         J1/pins 39 &          N/A
      alter                                    40

     SROM test connector                     J13               N/A

     Flash BIOS write protect                J14            Pins 2 & 3
      disabled                                                closed

      Flash BIOS write protect enabled        J14            Pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     32MB        (2) 1M x 36   (2) 1M x 36    (2) 1M x 36    (2) 1M x 36

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

     128MB       (2) 4M x 36   (2) 4M x 36    (2) 4M x 36    (2) 4M x 36

     256MB       (2) 8M x 36   (2) 8M x 36    (2) 8M x 36    (2) 8M x 36

     512MB       (2) 16M x 36  (2) 16M x 36   (2) 16M x 36   (2) 16M x 36

                    CACHE CONFIGURATION

       Size                SL1                 SL2

        2MB                2MB                None

        4MB                4MB                None

        8MB                4MB                 4MB

  Note: The sizes of the cache modules are unidentified.

                        CACHE JUMPER CONFIGURATION

       Size         J1/pins 11 & 12    J1/pins 13 & 14   J1/pins 15 & 16

       2MB              Closed              Open               Open

       4MB               Open              Closed             Closed

       8MB               Open              Closed              Open

                        CACHE ADDRESS CONFIGURATION

      Size              J15                J16                 J17

      2MB            Pins 1 & 2         Pins 2 & 3      Pins 2 & 3 closed
                      closed              closed

      4MB            Pins 1 & 2         Pins 1 & 2      Pins 2 & 3 closed
                      closed              closed

      8MB            Pins 1 & 2         Pins 1 & 2      Pins 1 & 2 closed
                      closed              closed

                         CACHE SPEED CONFIGURATION

       Speed          J1/pins 17 & 18   J1/pins 19 & 20  J1/pins 21 & 22

           6ns            Closed            Closed             Open

           8ns            Closed             Open             Closed

         10ns            Closed             Open              Open

          12ns             Open             Closed            Closed

          15ns             Open             Closed             Open

                           CPU DIVISOR SELECTION

    Divisor       J1/pins 1 &    J1/pins 3 &   J1/pins 5 &    J1/pins 7 &
                       2             4              6             8

       3            Closed         Closed         Open           Open

       4            Closed          Open         Closed         Closed

       5            Closed          Open         Closed          Open

       6            Closed          Open          Open          Closed

       7            Closed          Open          Open           Open

   8 (266MHz)        Open          Closed        Closed         Closed

   9 (300MHz)        Open          Closed        Closed          Open

  10 (333MHz)        Open          Closed         Open          Closed

       11            Open          Closed         Open           Open

       12            Open           Open         Closed         Closed

       13            Open           Open         Closed          Open

       14            Open           Open          Open          Closed

       15            Open           Open          Open           Open

