Jon Smirl wrote:
I'm still trying to figure why there is a need for this external mode
setting box. I would have thought that the hardware powers on with video
output disabled. When the host executes the VBIOS ROM it reads the DDC,
sets a mode, and enables video out. All of the cards default to 640x480
VGA if they can't find a valid EDID.
For a fixed frequency monitor you would just change the default mode for
when there is no EDID from 640x480 to whatever you need, reflash the
VBIOS and boot. No external box needed.
If there is no VBIOS part of the system boot process needs to program the
mode but it can still handle a fixed frequency monitor if the hardware
powers up with video output disabled.
It is the boot strap problem -- also called Catch 22.
You have the card in your computer and a monitor that won't support VGA
640x480. How do you get the system started?
--
JRT
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