TITLE
    Macintosh IIcx: External Pinouts (5/93)
Article ID:
Author:
Created:
Modified: 		12934

8/11/93
8/11/93
TOPIC

    Article Created: 29 April 1993


    This article gives the pin assignments and functions for the connectors on the
    Macintosh IIcx.

DISCUSSION


    Apple Desktop Bus (ADB)
    -----------------------
    Pin Signal name Signal description

    1 ADB Data

    2 PWRON Power on

    3 +5v +5 volts DC

    4 GND Signal ground

    - Connector type: 4-pin minicircular

    - Total length of all cables not to exceed 16 feet (5 meters)


    Modem and Printer Ports
    -----------------------
    Pin Signal name Signal description

    1 HSKo Handshake out

    2 HSKi Handshake in/external clock

    3 TXD- Transmit data -

    4 GND Signal ground

    5 RXD- Receive data -

    6 TXD+ Transmit data +

    7 GPi General purpose input*

    8 RXD+ Receive data +

    *Modem port only. Can be set in software to be a second external clock.

    - Connector type: 8-pin minicircular


    Disk Drive Port
    ---------------
    Pin Signal name Signal description

    1 GND Signal ground

    2 GND Signal ground

    3 GND Signal ground

    4 GND Signal ground

    5 -12v -12 volts DC

    6 +5v +5 volts DC

    7 +12v +12 volts DC

    8 +12v +12 volts DC

    9 NC No connection

    10 +5v Motor speed control

    11 PH0 Register select CA0

    12 PH1 Register select CA1

    13 PH2 Register select CA2

    14 PH3 Register write strobe LSTRB

    15 WRREQ/ Write request

    16 SEL Register select line SEL

    17 ENBL/ Drive enable

    18 RD Read data

    19 WR Write data

    - Connector type: DB-19


    SCSI Port (25-pin)
    ------------------
    Pin Signal name Signal description

    1 REQ/ Request

    2 MSG/ Message

    3 I/O/ Input/Output

    4 RST/ SCSI bus reset

    5 ACK/ Acknowledge

    6 BSY/ Busy

    7 GND Signal ground

    8 DB0/ Data bit 0

    9 GND Signal ground

    10 DB3/ Data bit 3

    11 DB5/ Data bit 5

    12 DB6/ Data bit 6

    13 DB7/ Data bit 7

    14 GND Signal ground

    15 C/D/ Common/Data

    16 GND Signal ground

    17 ATN/ Attention

    18 GND Signal ground

    19 SEL/ Select

    20 DBP/ Data parity

    21 DB1/ Data bit 1

    22 DB2/ Data bit 2

    23 DB4/ Data bit 4

    24 GND Signal ground

    25 TPWR Terminator power

    - Connector type: DB-25

    - Total length of all cables not to exceed 20 feet (6 meters)

    WARNING: The SCSI port uses the same type of connector as a standard RS-232,
    DB-25 serial interface, but it is different electrically. Do not connect any
    RS-232 device to this connector. Doing so can result in damage to both the
    device and the Macintosh LC.


    Audio Jack
    ----------
    Pin Signal name Signal description

    (Sleeve) GND Signal ground

    (Ring) RIGHT 1.5 volt peak-to-peak audio
    signal, right channel

    (Tip) LEFT 1.5 volt peak-to-peak audio
    signal, left channel

    - Connector type: Stereo miniature phone plug

    - The internal speaker is disabled when this port is in use.

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