ALPHA MICROSYSTEMS

AM-740

Card Type              Memory
Maximum Onboard Memory 128MB
I/O Options            Board connector (1)
Data Bus               VMEbus

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  Board connector              CN1      VMEbus                     CN3

  Parity status LED            CN2      VMEbus                     CN4

                            DRAM CONFIGURATION

            Note: The size and number of chips are unidentified. This
            memory board will be factory installed with 4MB, 8MB or 12MB.

                           BASE MEMORY SELECTION

            Size                                  W8

            None                1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 &
                                         12, 13 & 14, 15 & 16

             4MB                                 Open

             8MB                                 1 & 2

            12MB                                 3 & 4

            16MB                             1 & 2, 3 & 4

            20MB                                 5 & 6

            24MB                             1 & 2, 5 & 6

            28MB                             3 & 4, 5 & 6

            32MB                          1 & 2, 3 & 4, 5 & 6

            36MB                                 7 & 8

            40MB                             1 & 2, 7 & 8

            44MB                             3 & 4, 7 & 8

            48MB                          1 & 2, 3 & 4, 7 & 8

            52MB                             5 & 6, 7 & 8

            56MB                          1 & 2, 5 & 6, 7 & 8

            60MB                          3 & 4, 5 & 6, 7 & 8

            64MB                      1 & 2, 3 & 4, 5 & 6, 7 & 8

            68MB                                9 & 10

            72MB                             1 & 2, 9 & 10

            76MB                             3 & 4, 9 & 10

            80MB                         1 & 2, 3 & 4, 9 & 10

            84MB                             5 & 6, 9 & 10

            88MB                         1 & 2, 5 & 6, 9 & 10

            92MB                         3 & 4, 5 & 6, 9 & 10

            96MB                      1 & 2, 3 & 4, 5 & 6, 9 & 10

            100MB                            7 & 8, 9 & 10

            104MB                        1 & 2, 7 & 8, 9 & 10

            108MB                        3 & 4, 7 & 8, 9 & 10

            112MB                     1 & 2, 3 & 4, 7 & 8, 9 & 10

            116MB                        5 & 6, 7 & 8, 9 & 10

            120MB                     1 & 2, 5 & 6, 7 & 8, 9 & 10

            124MB                     3 & 4, 5 & 6, 7 & 8, 9 & 10

            128MB                 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10

            Note: If this memory board is used with an AM-175 CPU board
            (AM-1500 series), W8 must be set as follows: Pins 11 & 12, 13
            & 14, 15 & 16 closed. If the AM-1500 is used, only 16MB are
            available. Any memory above 16MB will be automatically
            disabled. Before this board can be installed in an AM-1500, a
            4MB memory board must be installed. Pins designated should be
            in the closed position.

               TIMING DETECTION SELECTION

       CPU board used                   W7

           AM-175                Pins 2 & 4 closed

           AM-180                Pins 2 & 4 closed

           AM-185                      Open

        AM-185 (50)          Pins 1 & 3, 2 & 4 closed