> But when the machine has been booted and is successfully running,
> evertything seems to work, but when the screen is filled, and I go
> further with e.g. typing, all sorts of weird thing going to happen.
>
> For example: the characters that are typed in, for, for example in
> dos, to give a command, change to other things.
If the characters on screen turn into garbage, it could also be
related to VRAM integrity problems. Have a look at the VRAMs, writing
a small program that tests the VRAM shouldn't be that difficult.
However, if the VRAM is defective, there should be some more evidence
of that i.e. garbage in the startup screen.
Tristan
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