TITLE
    Macintosh II High-Resolution Video Card: New Features
Article ID:
Author:
Created:
Modified: 		4059

8/20/89
8/20/89
TOPIC

DISCUSSION



    TOPIC -----------------------------------------

    This article describes the new features of the Macintosh II High-Resolution
    video card.

    DISCUSSION ------------------------------------

    The Macintosh II High-Resolution Display Video Card is the cost-reduced
    replacement for the previous 4- and 8-bit Macintosh II Video Card (M0211 and
    M5640). This new card is sold in 4- and 8-bit configurations (M0322 and M0324,
    respectively).

    This new release is fully compatible with the previous card when used with
    Apple's video drivers, monitors, and cable. Applications that make direct
    hardware calls may not work with the revised card. Also, third-party video
    cables may need to be changed (see item 2 below).

    New Features
    ------------

    The following minor features were added to the card. They should not have a
    major impact on the typical use of these cards.

    1. Monitor Type Detection

    At startup, the High-Resolution Display Video Card senses the monitor type by
    sensing a previously unused signal line: pin 4 in the D-15 video connector. The
    selection is as follows:

    SENSE 0 Monitor Type
    (Pin 4)
    1 or N/C NTSC Timing RGB video out
    0 12- and 13-inch Monitor Timing

    (Note: Some third-party cables may not be wired correctly to support this
    detection scheme.)

    2. New Driver Level Control of RS-170 RGB Video

    The card supports two RGB interlaced video resolutions:

    - 512 by 384 pixel (default mode) and
    - 640 by 480 pixels

    To select the higher resolution, the system needs the new Monitor CDEV and Slot
    Manager supplied with the 32-bit QuickDraw, plus the correct cable
    configuration (see item 1). Selection is made by choosing the monitor icon
    (highlighted borders) connected to the Macintosh II High-Resolution Video Card
    and clicking on the Options button. A dialog box will appear with the options.

    In addition, the card only produces RGB interlaced video in the 4- and 8-bit
    mode.

    3. Enhanced Firmware

    In addition to the scanning modes mentioned above, the card supports
    uncorrected gamma, has an integrated gamma directory, and implements a new set
    of driver calls to support these new features.


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