What is wrong?

Also when i press numbers and symbols keys they show as letters.

Yes

One of the VRAM chips is bad, always returns 1. The second of eight.

Looking at the board, the VRAM is the 4116’s I think.

@sd_snatcher Nothing wrong with bits 2 & 3, it’s just showing the backtick instead of the space (20H -> 60H).

it looks like data bus pin 6 always goes high

@sd_snatcher Nothing wrong with bits 2 & 3, it’s just showing the backtick instead of the space (20H -> 60H).

You're right. I counted the bits from the wrong side. So its 7-n, where n is the number I mentioned.