TITLE
    PowerBook Duo 210, 230, 250, 270c: External Pinouts (6/94)
Article ID:
Created:
Modified: 		12928
8/11/93
6/24/94
TOPIC


    This article gives the pin assignments and functions for the external
    connectors on the Macintosh PowerBook Duo 210, Duo 230, Duo 250, and 270c.

DISCUSSION


    ADB connector signal assignments
    --------------------------------
    Pin number Signal name Description

    1 ADB Bidirectional data bus for I/O

    2 /POWER ON Key on ADB keyboard grounds this pin-to-pin 4
    to turn on power supply

    3 +5V +5 V power.

    4 GND Ground


    Serial port connector signal assignments
    ----------------------------------------
    Pin Signal name Description

    1 HSKo Handshake output. Connected to the
    Request to Send (RTS) pin on the Combo
    chip. Tristated when the Data Terminal
    Ready (DTR) signal is inactive.

    2 HSKi Handshake input. Connected to the Transmit
    Receive Clock (TRXC) pin on the Combo chip.

    3 /TXD Transmit data (inverted). Connected to the
    Transmit Data (TXD) pin on the Combo chip.
    Tristated when DTR is inactive

    4 SG Signal ground. Connected to logic and
    chassis ground.

    5 /RXD Receive data (inverted). Connected to the
    Receive Data (RXD) pin on the Combo chip.

    6 TXD Transmit data. Connected to the Transmit
    Data (TXD) pin on the Combo chip.
    Tristated when DTR is inactive

    7 GPi General purpose input. Connected to the
    Data Carrier Detect (DCD) pin on the Combo
    chip.

    8 RXD Receive data. Connected to the Receive
    Data (RXD) pin on the Combo chip.

    9, 10, 11 GND These pins are connected to chassis ground


    PowerBook Duo Floppy Adapter
    ----------------------------
    The drive is connected through a custom HDI-20 high-density connector.

    Pin number Signal name Description

    1, 2, 3, 4 GND Ground

    5, 10, 20 nc No connection

    6, 7, 8, 9 +5V +5 V power for floppy drive

    11 PH0 State-control line 0

    12 PH1 State-control line 1

    13 PH2 State-control line 2

    14 PH3 State-control line 3

    15 /WRREQ Write data request

    16 HDSEL Head select

    17 /ENBL Floppy drive enable

    18 RD Read data

    19 WR Write data

    Article Change History:
    24 Jun 1994 - Added Duo 250 and 270c.

    Support Information Services

Document Information
Product Area: Computers
Category: PowerBook
Sub Category: PowerBook 200 Series (Duo)

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