Hello,
Here is a small update.
It was not possible to read the Bios while attached to the Board.
Next step was to desoldered it and “convert” to DIP8.
Read was now successful, so I added the DIP8 Socket to the MB and testet the old chip, it still worked.
I Flased a new Winbond Dip Flash and it worked too.
The next step will be the actual Bios Modding.
Greetings BazzT