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Re: OOTW speed .. strange

In article <behrenss.736695383@hphalle9>, behrenss@Informatik.TU-Muenchen.DE (Soenke Behrens) writes:
> Hallo
> 
> did anyone else notice this? When in full screen mode, OOTW is about
> 1.5 times slower than in Matted mode. Ok, no big deal, you say, after
> all it's got to manipulate more data. But, and here's the but: The speed
> remains the same wether I have my ZIP at 7.6 MHz or 12MHz. I.e., there's
> no noteable speed increase in full screen mode although I've got a fairly
> fast GS.
> 
> Anyone have a clue as to why that could be?
> 
> Yours
> 
> Soenke
> 
The screen buffer RAM always running at 1MHz is probably the bottleneck.
Graphics programs (which don't use QD) must synchronize their output to the
screen with the VBL interrupt to get flicker-free animation. I don't know
whether OOTW checks, how much screen memory it can shuffle around between
two VBLs. (e.g. Test Drive II has the same animation speed at 2.8 and 7MHz,
but the joystick is more responsive at 7MHz...)

--Urs

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