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Posted: **Mon Aug 12, 2024 7:22 pm**

I looked osdev for that info but didnt found anything about it. So, how to unlock (and lock) CRTC registers?

Posted: **Tue Aug 13, 2024 9:44 am**

Bit 7 of the Vertical Retrace End Register (index 0x11) is the write protect bit. Clear that bit to remove the write protection. You can read more about it in IBM's VGA documentation and in other VGA resources linked in the wiki.

Posted: **Wed Aug 14, 2024 7:14 am**

Octocontrabass wrote: ↑Tue Aug 13, 2024 9:44 am Bit 7 of the Vertical Retrace End Register (index 0x11) is the write protect bit. Clear that bit to remove the write protection. You can read more about it in IBM's VGA documentation and in other VGA resources linked in the wiki.

Thanks so much!

OSDev.org

How to unlock CRTC registers

How to unlock CRTC registers

Re: How to unlock CRTC registers

Re: How to unlock CRTC registers