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Text File | 1994-02-10 | 2.3 KB | 68 lines | [TEXT/GEOL] |
- Macintosh II High-Resolution Video Card: New Features
-
-
- This article last reviewed: 10 August 1989
-
- 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.
-
-
- Copyright 1989 Apple Computer, Inc.
-
-