TITLE
    Power Macintosh 9500: Pinouts
Article ID:
Created:
Modified:
18207
7/19/95
2/14/98

TOPIC

    This article presents the pinouts for Power Macintosh 9500 series computers. These pinouts include: ADB, GeoPort, SCSI, a floppy disk drive, built-in Ethernet, high-quality 16-bit stereo sound, and various levels of monitor support depending on the model.


DISCUSSION

    Apple Desktop Bus (ADB)
    ------------------------
    One connector is located on the back panel of Power Macintosh computers. It is a 4-pin mini-DIN socket.

    Pin    Description

    ---    -----------
    1     Data; grounded by an open collector or pulled to +5 V through 470
    2     Power on, fed by +5 V through 100 k; connect to pin 4 to turn on
    the system
    3     +5 V at 500 mA maximum drain; protected by a 1.25-A circuit breaker
    4     Ground return


    Ethernet
    --------
    All models of Power Macintosh contain built-in Ethernet.  The 9500's offer two types of connection.

    One AAUI-15 Ethernet connector

    Pin          Description           Pin          Description
    ---          -----------           ---          -----------
    1           +5 V                   8           +5 V
    2           DI+                    9           DO+
    3           DI-                   10           DO-
    4           Ground                11           Ground
    5           CI+                   12           No Connection
    6           CI-                   13           No Connection

    7           +5 V                  14           +5 V

    And One 10Base-T Ethernet connector (NOTE: If both 10BASE-T and AAUI connectors are plugged in, the computer uses the 10BASE-T connector by default.)

    The pin configurations for 10BASE-T are as follows:

    RJ-45 Connector
    -----------------------------
    |   1  2  3  4  5  6  7  8    |
    |   -----------------------   |
    |  |\\ \\ \\ \\ \\ \\ \\ \\|  |
    |  |                       |  |
    |  |                       |  |
    |  |                       |  |
    |  -----               -----  |
    |       |              |      |
    |        ---        ---       |
    |           |      |          |
    |            ------           |
    -------------------------------

    Contact:      Signal:
    1            TD+
    2            TD-
    3            RD+
    4            Not Used by 10BASE-T
    5            Not Used by 10BASE-T
    6            RD-
    7            Not Used by 10BASE-T
    8            Not Used by 10BASE-T


    Serial Ports
    ------------
    The back panel of all Power Macintosh models contain two I/O ports for serial telecommunication data.  Both sockets accept 9-pin plugs allowing either port to be independently programmed for asynchronous or synchronous communication formats up to 9600 bps.  This includes AppleTalk and the full range of Apple GeoPort protocols.


    Pin    Name                  Function
    ---    ----                  --------
    1     SCLK(out)             Reset pod or get pod attention
    2     Sync(in)/SCLK(in)     Serial clock from pod (up to 920 Kbit/sec.)
    3     TxD-                  Transmit -
    4     Gnd/shield            Ground
    5     RxD-                  Receive -
    6     TxD+                  Transmit +
    7     Wakeup/TxHS           Wake up CPU or do DMA handshake
    8     RxD+                  Receive +
    9     +5 V                  Power to pod (350 mA maximum)

    SCSI Connection
    ---------------
    The SCSI interface in Power Macintosh computers exists in two forms: an internal 50-pin ribbon connector for internal devices and an external DB-25 connector for external devices.

    Pin Number        Description          Pin Number        Description
    -------------------   -----------      -------------------   -----------
    Internal   External                    Internal   External
    1          7       Ground              2          8       /DATA0*
    3          9       Ground              4         21       /DATA1

    5         14       Ground              6         22       /DATA2
    7         16       Ground              8         10       /DATA3
    9         18       Ground             10         23       /DATA4
    11         24       Ground             12         11       /DATA5
    13                  Ground             14         12       /DATA6
    15                  Ground             16         13       /DATA7
    17                  Ground             18         20       /DATAP
    19                  Ground             20                  No connection
    21                  Ground             22                  No connection
    23                  Ground             24                  No connection
    25                  No connection      26         25       TERMPWR
    27                  Ground             28                  No connection
    29                  Ground             30                  No connection
    31                  Ground             32         17       /ATN
    33                  Ground             34                  No connection

    35                  Ground             36          6       /BUSY
    37                  Ground             38          5       /ACK
    39                  Ground             40          4       /RST
    41                  Ground             42          2       /MSG
    43                  Ground             44         19       /SEL
    45                  Ground             46         15       /C/D
    47                  Ground             48          1       /REQ
    49                  Ground             50          3       /I/O

    * A slash (/) before a signal name indicates that it is in the low state
    when active.


    Floppy Disk Drive Connection
    ----------------------------
    All Power Macintosh models contain one internal Apple superDrive floppy disk drive, which supports GCR and MFM formats for 1.44 MB disks.

    Pin   Signal   Description              Pin   Signal   Description
    ---   ------   -----------              ---   ------   -----------
    1   GND      Ground                    11   +5 V     +5 V
    2   PH0      Phase 0 state control     12   SEL      Head select

    3   GND      Ground                    13   +12 V    +12 V
    4   PH1      Phase 1 state control     14   /ENBL*   Drive enable
    5   GND      Ground                    15   +12 V    +12 V
    6   PH2      Phase 2 state control     16   RD       Read data
    7   GND      Ground                    17   +12 V    +12 V
    8   PH3      Phase 3 register write    18   WR       Write data
    strobe
    9   NC       No connection             19   +12 V    +12 V
    10   /WRREQ   Write data request        20   NC       No connection

    * A slash (/) before a signal name indicates that it is in the low state
    when active.


    Monitor Support
    ----------------
    The Power Macintosh 9500/120 includes an accelerated display card based on the mach64 graphics accelerator from ATI Technologies, Inc.

    Pin   Description                  Pin   Description
    ---   -----------                  ---   -----------
    1   Red ground                     9   Blue video signal
    2   Red video signal              10   Monitor sense 2
    3   Composite synchronization     11   Synchronization ground

    4   Monitor sense 0               12   Vertical synchronization
    5   Green video signal            13   Blue ground
    6   Green ground                  14   Horizontal synchronization ground
    7   Monitor sense 1               15   Horizontal synchronization
    8   No connection

    The Power Macintosh 9500/132 requires a third-party (non-Apple) graphics accelerator for display support.

    Sound I/O
    ---------
    All Power Macintosh computers contain external stereo 3.5mm jacks for sound I/O, connected through amplifiers to the AWAC chip.

    Panel label      Description
    -----------      -----------
    Audio In         8 k impedance, 2 V rms maximum, 22.5 dB gain available
    Audio Line Out   37  impedance, 0.9 V rms maximum, attenuated -22,5 dB
    (crosstalk degrades from -80 to -32 dB when the audio
    output is connectedto 32  headphones)



Document Information
Product Area: Computers
Category: Power Macintosh
Sub Category: Power Macintosh 9500

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