In windows registry at branch
for RADEON:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ati2mtaa\Device
<0..9>
for RAGE 128/128 PRO:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ati2mtag\Device
<0..9>
In Windows
XP, independent of card model:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video{ClassID}
Was plased key called DALRestrictedModesBCD (REG_BINARY type).
This key disables videomodes, defined in it.
Format:
xx1,xx1,yy1,yy1,bb1,bb1,rr1,rr1,xx2,xx2,yy2,yy2.....
Where xx,xx
- horisontal resolution, for example 06,40
yy,yy - vertical resolution, for example 04,80
bb,bb - color depth, for example 00,24
rr,rr - disabling refresh rate, for
example 00,60
Key looks as: 06,40,04,80,00,24,00,60 - in 640x480 resolution with 24Bpp disabling 60Hz
mode.
Value 00,00 means "for any case", for
example 00,00,00,00,00,24,00,00 means disabling of all 24Bpp modes.