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Appendix 1 – Defining Custom Modes
Custom Mode information is stored in the Registry at:
•
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DGC123\Device0
In a REG_MULTI_SZ value named "Mode". Each mode definition is on a single line (there
can be multiple mode definitions each on a new line). The mode definition should be typed in
the following format as a comma-separated string:
X, Y, Refresh, hfp, hsync, hbp, vfp, vsync, vbp, hpol, vpol, dotclock
For example:
1280,1024,50,24,240,144,3,3,1,0,0,90139
The following table explains what each value represents:
X
Y
Refresh
hfp
hsync
hbp
vfp
vsync
vbp
hpol
vpol
dotclock
Note
If this registry value is amended the TWIN tab must be closed then re-opened to ensure
the new values are read from the Registry.
16/03/2006
Active display width in pixels
Active display height in lines
Refresh rate displayed in dialog. Also used for calculating dot-
clock if no dotclock value is provided
Horizontal front porch in pixels (value must be divisible by 8)
Horizontal sync width in pixels (value must be divisible by 8)
Horizontal back porch in pixels (value must be divisible by 8)
Vertical front porch in lines
Vertical sync width in lines
Vertical back porch in lines
Horizontal sync polarity (0 = negative, 1 = positive)
Vertical sync polarity (0 = negative, 1 = positive)
Pixel dot-clock in KHz (optional). Allows more accurate control of
the dot-clock
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