Call With
EAX = VDD_PRE_CRTC_MODE_CHANGE equate (86H)
EBX = Magic Number
All other registers can contain private communication information which is passed directly to the mini-VDD function PRE_CRTC_MODE_CHANGE.
Return Values
Whatever the mini-VDD and the display driver have arranged between themselves.
Remarks
The purpose of this function and for VDD_POST_CRTC_MODE_CHANGE is to set monitor refresh rates on the display card prior to the setting the video hardware into Windows hi-res mode. Some display cards require the refresh rate to be set before the video mode change, others require it after the video mode change. These routines allow that to happen.
This function calls the mini-VDD function PRE_CRTC_MODE_CHANGE.
See also PRE_CRTC_MODE_CHANGE