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000059_amos-request@svcs1.digex.net_Thu Sep 2 04:17:58 1993.msg
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Date: Thu, 2 Sep 1993 17:29:17 +1000 (EST)
From: Scott Southurst <maverick@deakin.edu.au>
Subject: RE: Jumping/flickering/stuttering/have fits etc.
To: LIST AMOS <amos-list@access.digex.net>
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Given that it was my proggy that started all this I think I should put in
my 2 cents.
Some people have said that the provided demo on the extras etc. had this
stuttering problem (Example 10.10). I myself have not noticed this
problem in those proggies.
The manual does say it should be Screen Swap then Wait Vbl. If
the Screen Swap is meant to occur just after the next Vblank then why do
you need a Wait Vbl at all?? If you leave out the Wait Vbl's then 9 times
out of 10 the flickering is worse (As I found in the game I am now writing).
I haven't actually examined the code lately but I may have used
Screen Copy instead of Scroll. This could be the problem as Screen Copy
is slower (I think thats right I can't remember correctly, but I do know
that after my tests on this I do now use scroll).
With reguards to the timing of the flicker I don't know that this
is totally valid. It does show that when it occurs it is fairly constant
but in my experience the flicker does not always happen. I have had the
program run before with no flickers, which just doesn't seem correct.
||\ ***********************************************
./~ \ * Scott Southurst (maverick@deakin.edu.au) *
~~\ \ * Deakin University, Warrnambool, Australia *
// \ * Aquatic Biology/Computer Programming *
| \___/| * A500 - 1084s - 1meg - AMOS 1.34 - AMOS 3d *
/~/~~ ___/ * Compiler - AND LOVING IT!! (Soon A1200??) *
~~~~~~~~ ***********************************************