home *** CD-ROM | disk | FTP | other *** search
Text File | 1994-02-10 | 2.8 KB | 74 lines | [TEXT/GEOL] |
- Macintosh Display Card 8/24GC and Raster Ops Monitors
-
-
- This article last reviewed: 3 May 1990
-
- TOPIC -----------------------------------------------------------
-
- I have a RasterOps Colorboard 108 plus video card and a RasterOps 19-inch
- Trinitron monitor. I also have two questions:
-
- 1) Does the Macintosh Display Card 8/24GC support the RasterOps 19-inch
- Trinitron monitor?
-
- 2) If I install the Macintosh Display Card 8/24GC but don't connect a
- monitor to it, will it accelerate the display on the RasterOps monitor?
-
- DISCUSSION ------------------------------------------------------
-
- 1) The Macintosh Display Card 8/24GC supports any display that meets one of the
- following specifications:
-
- Sense pins Hor x Vert Dot Vert Horiz
- 10 7 4 Display Pixels Clock Refrsh Refrsh
- ---------- ---------------------- ---------- ------- ------ ------
- 0 0 1 Apple Portrait Display 640 x 870 57.2832 75 68.9
- 0 1 1 Apple Two-Page 1152 x 870 100 75 68.7
- Monochrome Monitor
- 1 1 0 12-Inch Apple 640 x 480 30.24 66.7 35.0
- Monochrome Monitor
- 1 1 0 13-Inch AppleColor 640 x 480 30.24 66.7 35.0
- RGB Monitor
-
- 0 - Grounded 1 - Not Connected
-
- Note that sense pins 4, 7, and 10 are referred to as SENSE0, SENSE1, and
- SENSE2 in pinout tables for the video connectors.
-
- None of the RasterOps 19-inch Trinitron displays meets the above
- specifications. One of their 19-inch Trinitron displays has a vertical
- refresh of 75Hz and a horizontal refresh of 60.241KHz. We do not think that
- this will work properly, but you can try it in the "Apple Two-Page
- Monochrome Monitor" mode.
-
- Here are the pinouts for the Macintosh Display Card 8/24GC:
-
- Pin Description
- --- -----------
- 1 Red Video Ground
- 2 Red Video
- 3 Composite Sync
- 4 SENSE0
- 5 Green Video
- 6 Green Video Ground
- 7 SENSE1
- 8 Not Connected
- 9 Blue Video
- 10 SENSE2
- 11 Composite Sync and Vertical Sync Ground
- 12 Vertical Sync
- 13 Blue Video Ground
- 14 Horizontal Sync Ground
- 15 Horizontal Sync
- Shell Chassis Ground
-
- 2) If no monitor is connected to the Macintosh Display Card 8/24GC, the card
- will, in effect, turn itself off and not accelerate the RasterOps display
- system. You can trick the card into thinking that a monitor is attached by
- grounding pin 4. This will cause the card to accelerate other displays in
- the system.
-
-
- Copyright 1990 Apple Computer, Inc.
-
-