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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". EXTENDED Information section - Apple Internal Use - Service Providers and Support Professional APPLE EYES ONLY Information section - Apple Need-To-Know Confidential Article Change History: |
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