Edid rom modding for color depth bit in ami bios

BIOS/UEFI Modding BIOS Modding Guides and Problems
1

I PURCHASED CHINESE GM45 CHIPSET MOTHERBOARD. IT HAVE AMI BIOS , IT HAVE ALL RESOLTUION IN 18BIT , BUT I REQUIRED 800X600 IT WAS 24BIT, THERE IS NO OPTION FOR 18BIT. I WANT TO CHANGE SCREEN BIT BY BIOS MODDING

photo_2023-06-25_09-16-57
photo_2023-06-25_09-16-571220×790 106 KB

bk gm45-3.zip (443.6 KB)

2

Graphics model?

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3

What did you mean by graphics model ?
Please give explain me with example

4

Do you use GM45 integrated graphics or a videocard?

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5

Gm45 integrated graphics is used

6

Try these roms:
GM45.zip (878.9 KB)
I updated VBIOS part in the hope of better compatibility.

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7

I have tested both rom in amibcp ultities, but it’s also showing 800x600 in 24 bit , but i want 800x600 in 18bit, but i don’t tried in Motherboard this roms

8

There’s no modes other than this, so I can’t unlock 800x600 18bit.
But new VBIOS may override any preset value to the desired one, if we’re lucky.