Date   : Sat, 30 Dec 2000 15:35:15 +0000
From   : Ben Newsam <ben@...>
Subject: Re: Aspect ratio of BBC screen?

In message <NDBBIEGJPLKLGGJFKFPDGEHICBAA.mark@...>, Mark de
Weger <mark@...> writes
>Can anyone tell me what the aspect ratio of actual BBC screens is? (I don't
>have a BBC at hand to test.) I thought I inferred from old Acorn
>documentation it's 1.25. However, in the emulators (BeebEm at least) it's
>1.33. And then I read somewhere it varies according to the screen mode.
>Help!

Well, in MODE 1 at least[1], you will get your squares looking pretty
darned close to square if you multiply all Y-values by 1.175.

[1] On a real Beeb, that is, I haven't tried in the emulators. Since we
were discussing the US MOS elsewhere, the figure for that was more like
1.095.
-- 
Ben