[Savage40] Image flip - Pro savage

[Young Kim]

HI, we are developing a system that based on Windows XP embedded.
The graphics chip we are using is S3 twister.

We are trying to make 780x780 resolution and tried to twick some register.
But the system occasionally flip the image horizontally and vertically
- like a mirror diagonally.
Then it flips back after some time.

I am wondering if there are any register to flip the image - probably
horizontal flip and vertical flip at the same time.
We want to lock them right after boot up or monitor why those
registers are changing.

Thanks.

-B.