PATH ADC Home > Documentation > Hardware > Device Managers and Drivers > PCI Card Services > Designing PCI Cards and Drivers for Power Macintosh Computers

  

Timing Information

The file Video.h contains constants for Apple-defined timings. A driver returns the timing for a given display mode by GetTimingInfo. The csTimingData field of the VDTimingInfoRec contains the timing constant for the display mode. The Display Manager and smart monitors use it to adjust the valid and safe flags. The VDTimingInfoRec structure is described in Data Structures.

Timing information should reflect the actual timing driving the display. For example, even if a card creates a large graphics device with hardware pan and zoom for a 13-inch RGB display, it should still return timingApple13.

Some Apple displays support display modes such as 640x480 on a 16-inch display. The display is being driven at 16-inch timing, but the graphics device is built smaller. The timing information for that display mode should still be timingApple16.

© 1999 Apple Computer, Inc. – (Last Updated 26 March 99)