Thank you very much. Is it that easy?
Now it works. I get now the Firmware Update... option in the Menu in playback mode.
and then I get the CHDK menu.
This was what I mentioned and tried:
From CHDK - CHDK Wiki
I selected SD700IS - CHDK Wiki
And then I did what I described what was mentioned there.
And the other uppercape / lowercase:
From: FAQ - CHDK Wiki
Q and A. How do I get CHDK onto my camera's SD memory card?
There is otherwise described then your option.
So thank you very much.
One other question - or perhaps I should start this with a new question:
On the display of the Canon Ixus 800 IS (=SD 700 IS) when in record mode:
and disp + enter
- you only see a white rectangle in the middle and
- you see a white hand below (=IS):
Could you both turn off? (according to Canon you can't)
So you get a screen without anything on it.
When you put IS (=Image Stabilisation) always on, you know that.
You don't have to see this.
The same when you turn AiAF off. It is always in the middle.
So you don't have to see this.
Is that possible with CHDK for the Canon Ixus 800 IS?
N.B. due to a week away I will react after this week when you reply.