TITLE
    Display Card 824: How to output NTSC without a converter
Article ID:
Author:
Created:
Modified:
8256

8/30/91
7/2/92

TOPIC



    Can the Macintosh Display Card 8*24 be used to display images from the
    Macintosh on a video display or a TV without an NTSC converter?


DISCUSSION


    The Display Cards 8*24 and 8*24 GC do not use software for switching to the
    NTSC interlaced mode. To put the Display Card 8*24 into the NTSC mode, a
    properly configured cable is all that is required. Most NTSC devices use an
    RCA-type phono-connector, so this diagram uses that as a reference point.

    Adjust the phono-connector side to whatever type of connector is used. "Tip" is
    the pin in the center of the connector (the signal); the sleeve is flanged
    around the outer edges of the connector (the chassis ground).

    Card Connector RCA-Type Phono-Connector
    -------------- ------------------------
    4 MON.ID1 (sense0) --|
    7 MON.ID2 (sense1) --|
    11 C&VSYNC.GND --------|

    5 GRN.VID -----------------> Tip (signal)
    Shell CHASSIS.GND --------------> Sleeve (ground)

    By grounding pin 4 and pin 7 to pin 11, the video cards are told that an
    interlaced (NTSC) monitor is attached. The actual black and white video signal
    is on pin 5 and connects to the center (Tip) of the phono-plug. The shell of
    the card connector connects to the sleeve of the phono-plug.

    To acquire a color NTSC signal from any Apple Macintosh display card, an
    RGB-to-NTSC converter is required.

    For more information, search under "NTSC video encoding".




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